Showing papers on "Chemical resistance published in 1995"
TL;DR: In this article, the parent and chemically modified coir were characterized by FTIR spectra and showed significant hydrophobicity, improved tensile strength, and good chemical resistance.
Abstract: Coir fibers were chemically modified through alkali treatment, and crosslinking with formaldehyde, para-phenylene diamine, phthalic anhydride, and combined crosslinking-cyanoethylation reactions in appropriate solvent and catalyst. The parent and chemically modified coir were characterized by FTIR spectra. The percent moisture regain, tensile strength, and behavior toward some chemical reagents (solubility %) of parent and chemically modified fibers have also been evaluated. The modified fibers showed significant hydrophobicity, improved tensile strength, and good chemical resistance. © 1995 John Wiley & Sons, Inc.
33 citations
TL;DR: In this article, the diglycidyl ether of bisphenol-A (DGEBA) epoxy resin was toughened by aminophenyl functional reactive polyethersulfones (R-PES) or by t-butyl terminated non-reactive polyether sulfone (T-Pes), and the maximum K1C fracture toughness was around 2.2 MPa-m 0.5.
Abstract: The diglycidyl ether of bisphenol-A (DGEBA) epoxy resin was toughened by aminophenyl functional reactive polyethersulfones (R-PES) or by t-butyl terminated non-reactive polyethersulfones (T-PES). The molecular weights of PES were controlled to afford 5,000 to 20,000 g/mole and loadings were also varied from 5 to 30 wt.%. Epoxy networks cured with 4, 4'-diaminodiphenylsulfone (DDS) were subjected to Tg determinations, plane strain fracture toughness (K1C) measurements, chemical resistance tests and morphological studies by SEM. Very significantly improved K1C fracture toughness was obtained with reactive PES toughening without loss of chemical resistance, while non-reactive PES blended epoxy resins exhibited only slightly improved fracture toughness but poor chemical resistance. It was possible to load up to 30 wt.% of PES without utilizing solvent and the maximum K1C fracture toughness with R-PES was around 2.2 MPa-m 0.5, which was equivalent to the neat thermoplastic resin. Ductile fracture of the PES phase is suggested as a major toughening mechanism and this is highly dependent of the excellent adhesion developed between the PES and epoxy phases due to the chemical bonds. The systems demonstrated that chemical resistance of thermosets can be combined with the tough characteristics of thermoplastics.
31 citations
TL;DR: The chemical resistances of epoxy resin-based compositions are significantly affected by the chemical composition, shape, size and concentration of the inorganic fillers and pigments used.
20 citations
Patent•
07 Jun 1995TL;DR: In this article, a process for preparing a UV-curable coating material comprising the steps of effecting a hydrolysis reaction of (a-1) 40 to 90 parts by weight of colloidal silica, and (b) 60 to 10 parts of a hydrozeate of an alkoxy silane compound containing not less than 50% of a compound of the formula (I) ##STR1## replacing the dispersion medium of the colloidal Silica with a nonpolar solvent when the amount of dehydration is in the range of 50 to 90% of theoretical
Abstract: Disclosed is a process for preparing a UV-curable coating material comprising the steps of effecting a hydrolysis reaction of (a-1) 40 to 90 parts by weight of colloidal silica, and (a-2) 60 to 10 parts by weight of a hydrolyzate of an alkoxy silane compound containing not less than 50% by weight of a compound of the formula (I) ##STR1## replacing the dispersion medium of the colloidal silica with a nonpolar solvent when the amount of dehydration is in the range of 50 to 90% of theoretical value; and effecting a further condensation reaction while maintaining in the state of 30 to 90% by weight of solid components in the presence of the nonpolar solvent. A coating composition containing the UV-curable coating material can form an anti-abrasion-coating film having excellent abrasion resistance, surface smoothness, thermal resistance, chemical resistance, durability, weather resistance and adhesion to the substrate.
20 citations
Patent•
24 May 1995
TL;DR: In this article, the authors proposed a coating material composition consisting of a polyisocyanate compound, an ultraviolet-curing polyfunctional (meth) acrylate, a dispersant composed of a specific ceramic component, a light stabilizer and a photopolymerization initiator in the ratio of 20-80wt.% of the component C based on the total of the components A, B and C and in an amount of 5-60wt.%.
Abstract: PURPOSE: To obtain a coating composition capable of forming a thick coating film excellent in stain resistance, stain removal, weather resistance, chemical resistance and appearance, etc., by one coating operation, sufficiently curable at a part with insufficient ultraviolet light irradiation, high in environmental protection and safety. CONSTITUTION: This coating material composition comprises (A) a resin obtained by polymerizing a monomer containing a polymerizable double bond, having 50-120 deg.C glass transition temperature, 3,000-100,000 number-average molecular weight, 50-150 hydroxyl number and 1-25 acid value, (B) a polyisocyanate compound, (C) an ultraviolet-curing polyfunctional (meth)acrylate containing two or more (meth)acryloyl groups and having 190-2,000 number-average molecular weight, (D) a dispersant composed of a specific ceramic component, (E) a light stabilizer and (F) a photopolymerization initiator in the ratio of 20-80wt.% of the component C based on the total of the components A, B and C and in an amount of 5-60wt.% of the solid content of the component D based on the total solid contents.
20 citations
Patent•
25 Jan 1995TL;DR: A two-pack aqueous coating composition which comprises a first pack component composed of alkoxy-silane-containing, water-dispersible acrylic copolymer and a second pack component consisting of polyisocyanate is described in this article.
Abstract: A two-pack aqueous coating composition which comprises a first pack component composed of alkoxy-silane-containing, water-dispersible acrylic copolymer and a second pack component composed of polyisocyanate. Use of this coating composition allows formation of coating films excelling in waterproofness, solvent-resistance, chemical resistance, drying properties, etc., and exhibiting markedly improved physical properties as a paint film such as tensile strength, elongation, etc.
17 citations
Patent•
12 Apr 1995
TL;DR: In this paper, a non-crystalline fluorine-contg. polymer is used to obtain an optical material having heat resistance, moisture resistance, chemical resistance and incombustibility with which light from UV rays to near infrared rays can be transmitted with extremely low loss.
Abstract: PURPOSE:To obtain an optical material having heat resistance, moisture resistance, chemical resistance and incombustibility with which light from UV rays to near infrared rays can be transmitted with extremely low loss by using a fluorine polymer substantially containing no C-H bonds. CONSTITUTION:This material consists of a noncrystalline fluorine-contg. polymer (a) which substantially does not contain C-H bonds and a material (b) having >=0.01 difference of refractive index from the refractive index of the fluorine- contg. polymer (a). The material (b) is distributed to give a gradient of density in a specified direction in the fluorine-contg. polymer (a). The noncrystalline fluorine-contg. polymer has excellent transparency since scattering due to crystallinity is not caused. As for the fluorine-contg. polymer (a), any noncrystalline fluorine-contg. polymer may be used as far as it does not contain C-H bonds, and especially, a fluorine-contg. polymer having a cyclic structure in the main chain is preferable. As for the material (b), a low mol.wt. compd., oligomer or polymer containing aromatic rings such as benzene ring, halogen atoms such as chlorine, bromine and iodine, and coupling groups such as ether bonds are preferably used.
17 citations
Patent•
15 Sep 1995
TL;DR: In this article, a bis-oxazolidine compound has been used as a diluent in polyurethane coating systems to improve the physical properties of a coating, such as impact resistance, abrasion resistance, chip resistance, salt resistance, acid resistance and organic chemical resistance.
Abstract: The present invention provides compositions and methods of using a bis-oxazolidine compound having formula (I), wherien: R1 and R1' are, individually, a methyl group, or a branched or straight chain alkyl or alkanol group; R2, R3, R4, R2', R3' and R4' are, individually, a hydrogen atom, a methyl group, a straight chain or branched chain alkyl or alkanol group, a cyclic alkyl or an aryl group; and R5 is a methyl or methylol group, or a branched chain or straight chain alkyl or alkanol group. The bis-oxazolidines are useful in improving the physical properties of a coating. Weatherability, impact resistance, abrasion resistance, chip resistance, salt resistance, acid resistance and organic chemical resistance of a coating is improved by the use of a bis-oxazolidine. Further, the bis-oxazolidine is used as areactive diluent in polyurethane coating systems. The compound is admixed with a preparation to reduce volatile organic content of the preparation and improve rheological properties of the preparation. In another aspect, a polyurethane coating composition that includes a blocked polyisocyanate, and a bis-oxazolidine is provided.
11 citations
Patent•
07 Nov 1995
Abstract: PURPOSE:To provide a polyamideimide resin compsn which is excellent in moldability and gives a molded item excellent in surface properties, chemical resistance, storage stability, and mechanical properties without detriment to its inherent heat resistance CONSTITUTION:This polyamideimide resin compsn contains a modified arom polyamideimide resin which is formed by modifying, with a hydroxy group containing polyester-modified polysiloxane copolymer, an arom polyamideimide resin formed from a trimellitic acid deriv and an arom diisocyanate or an arom diamine The amt of the modified polysiloxane copolymer used as above is 001-20wt% of the compsn
11 citations
Patent•
14 Mar 1995
TL;DR: In this paper, a sealing material composition is obtained by blending a main agent liquid containing a polyol having 10-150mgKOH/g total weight-average hydroxyl value, a catalyst, a water foaming agent, a foam stabilizer such as a compound of the formula [R is a 1-4C alkyl, etc., R' is a divalent organic group; (n) is 2-4; (x), (y) and (z) are >=1] and an agent for improving permanent stress to compression or elongation with (
Abstract: PURPOSE:To obtain the composition excellent in thermal permanent strain characteristics, heat resistance and chemical resistance and useful for lamp tools, etc., for vehicles, etc., by mixing a specific main agent liquid with a curing agent liquid in a specific ratio. CONSTITUTION:This sealing material composition is obtained by blending (A) 100 pts.wt. of a main agent liquid containing a polyol having 10-150mgKOH/g total weight-average hydroxyl value, a catalyst, a water foaming agent, a foam stabilizer such as a compound of the formula [R is a 1-4C alkyl, etc.; R' is a divalent organic group; (n) is 2-4; (x), (y) and (z) are >=1] and an agent for improving permanent stress to compression or elongation with (B) 10-300 pts.wt. of a curing agent liquid consisting of a polyisocyanate and/or a modified polyisocyanate having two or more terminal isocyanate groups. In the composition, the permanent strain improver in the component A consists of a halogen- based thermoplastic resin, e.g. a vinilidene resin, having <=2mum average primary particle diameter.
9 citations
Patent•
07 Nov 1995
TL;DR: In this article, a polyamideimide resin containing trimellitic acid residues and alkylene glycol bisanhydrotrimellitate residues as constituting units and having an intrinsic viscosity of >= 1 dl/g was used for coating the inner surfaces of chemical agent cans.
Abstract: PURPOSE:To obtain the subject coating composition comprising a polyamideimide resin having a specific intrinsic viscosity and an acid value, an organic solvent capable of dissolving the resin, and a curing agent, and excellent in adhesivity, bending processability, chemical resistance at high temperatures and pot life CONSTITUTION:(A) A polyamideimide resin containing trimellitic acid residues and alkylene glycol bisanhydrotrimellitate residues as constituting units and having an intrinsic viscosity of >=01 dl/g, (B) an organic solvent (eg N- methyl-2-pyrrolidone) capable of dissolving the resin, and (C) a curing agent comprising an epoxy resin, a melamine resin, a phenolic resin, a polyfunctional isocyanate compound, etc, are compounded with each other to obtain the objective coating composition giving coated coating films excellent in impact resistance, chemical resistance and can-producing properties such as adhesiveness and bending processability, having long pot life, and used for coating the inner surfaces of chemical agent cans
Patent•
09 Feb 1995
TL;DR: In this article, the surface of the heat exchanger is coated with a fluororesin having excellent chemical resistance and characteristics in that the hardness is R96 or more, the taper abrasion is less than 8.7 mg, the linear expansion coefficient is 7.5 to 8.0×10-5/°C, and the elongation is 223 to 280%.
Abstract: The present invention provides a heat exchanger having a coating with durability which causes neither adhesion of sludge nor separation of the coating within a short time. The surface of the heat exchanger is coated with a fluororesin having excellent chemical resistance and characteristics in that the hardness is R96 or more, the taper abrasion is less than 8.7 mg, the linear expansion coefficient is 7.5 to 8.0×10-5 /°C., and the elongation is 223 to 280%. The fluororesin is preferably poly chloro tri fluoro ethylene with 1-2 weight percent cobalt.
Patent•
01 Feb 1995
TL;DR: In this paper, a polyarylene sulfide composite material is obtained by uniformly dispersing (B) 0.01-5wt.% metal of the group VIII or Ib of the periodic table of elements having 0.5-30nm average particle diameter into (A) 95-99.99wt.%.
Abstract: PURPOSE: To obtain a polyarylene sulfide composite material having heat resistance, chemical resistance and flame retardancy and enabling application to electronic parts, automobile parts excellent in strength and elongation and materials having toughness. CONSTITUTION: This material is obtained by uniformly dispersing (B) 0.01-5wt.% metal of the group VIII or Ib of the periodic table of elements having 0.5-30nm average particle diameter into (A) 95-99.99wt.% polyarylene sulfide. The material is obtained by dissolving, e.g. 0.02-10wt.% metal salt of the formula M m X n [M is a metal of the group VIII or Ib of the periodic table; X is a halide ion, SO 4 2- , NO 3 - , etc.; (m) is 1 or 2; (n) is 1-4] in a solvent and mixing the solution with 90-99.98wt.% component A, removing the solvent to afford a solid solution comprising the component A and a metal salt or mixture thereof, heating the solid solution or the mixture to 300-400°C, melting and kneading the solid solution or the mixture at 10-500sec -1 shear rate, reducing the metal salt to a metal and uniformly dispersing the metal into the component A. COPYRIGHT: (C)1996,JPO
Patent•
15 Aug 1995
TL;DR: In this paper, a thermoplastic resin composition suitable as a molding material especially excellent in weather resistance, chemical resistance, moldability, etc., was provided by adding both a specific UV absorber and a specific stabilizer to a composition comprising an aromatic polycarbonate and a thermoplastic polyester.
Abstract: PURPOSE:To provide a thermoplastic resin composition suitable as a molding material especially excellent in weather resistance, chemical resistance, moldability, etc., by adding both a specific UV absorber and a specific stabilizer to a composition comprising an aromatic polycarbonate and a thermoplastic polyester. CONSTITUTION:This composition is produced by adding (D) 0.01-3 pts.wt. of a benzotriazole UV absorber of formula I (X is phenyl, OH or 1-10C alkyl- substituted phenyl; R1 to R4 are H, phenyl, etc.,) [preferably-2-(5-methyl-2- hydroxyphenyl)benzotriazole] and (E) 0.01-3 pts.wt. of a hindered amine stabilizer of formula II (R5 to R8 are H, CH3) (e.g. a compound of formula III) to 100 pts.wt. of a resin composition comprising (A) 10-90wt.% of an aromatic polycarbonate resin (preferably the resin produced from bisphenol A as a main raw material), (B) 90-10wt.% of a thermoplastic polyester (e.g. polyethylene terephthalate), and (C) 0-20wt.% of an impact resistance-improving agent (preferably a polyester elastomer).
Patent•
24 Mar 1995
TL;DR: In this article, a leadless glass compsn. is presented, consisting of, by weight, 45.0-60.0%, in total, of alkali metal oxides including ≥ 2.0% Li 2 O, 15.0 -30.0%.
Abstract: PURPOSE: To impart a leadless safe compsn. not retarding color forming by a pigment and to improve chemical resistance and peeling resistance. CONSTITUTION: This leadless glass compsn. is an Li 2 O-Al 2 O 3 -SiO 2 glass compsn. consisting of, by weight, 45.0-60.0% SiO 2 , 4.0-18.0% Al 2 O 3 , 5.0-10.0%, in total, of alkali metal oxides including ≥2.0% Li 2 O, 15.0-30.0% B 2 O 3 and 3.0-7.0% ZrO 2 . The weight ratio of Al 2 O 3 to Li 2 O is ≥1.2 and the softening point of the compsn. is 700-760°C. COPYRIGHT: (C)1996,JPO
Patent•
02 Oct 1995
TL;DR: In this paper, new crosslinkers for polymers with acid anhydride groups on the basis of amines or polyamines that are adsorbed on anhydrous molecular sieve powder.
Abstract: Subjects of the invention are new crosslinking agents for polymers with acid anhydride groups on the basis of amines or polyamines that are adsorbed on anhydrous molecular sieve powder. In blends with the polymers containing acid anhydride groups and under water-free conditions, the new crosslinkers form crosslinkable polymer systems that are storage-stable at room temperature. The crosslinking reaction is triggered by water or elevated temperature, leading to desorption of the amines by the molecular sieve powder and reaction with the anhydride groups. The crosslinking products are very soft to hard compositions with different tensile strength, tear resistance, permanent set, glass transition temperature, heat resistance, adhesion, tackiness and chemical resistance. The polymer systems can be used in the manufacture of molding compositions, coating compositions, foams, adhesive compositions, hot melt compositions and sealant compositions.
Patent•
04 Dec 1995
TL;DR: In this paper, the problem of providing an optical transparent laminated film having excellent gas barrier property, solvent resistance, heat resistance, chemical resistance, water resistance, flexibility, and adhesion is addressed.
Abstract: PROBLEM TO BE SOLVED: To provide an optical transparent laminated film having excellent gas barrier property, solvent resistance, heat resistance, chemical resistance, water resistance, flexibility, and adhesion. SOLUTION: After a metallic oxide layer (layer A) is formed by a gas phase growing method on at least one face of a transparent high molecular film of polycarbonate, a coating agent layer which is formed of the under-mentioned (a)-(b) [a/b=5/1-1/2 (weight ratio)] and is adjusted to pH3-11 is applied on the layer A. Thereafter, it is heated so as to form a PVA hardened film (layer B) which is crosslinked by the component (b). The (a) represents a polyvinyl alcohol(PVA), (b) represents a (partial) hydrolysate of an alkoxysilane to be shown by a general expression R n-Si(OR )4-n such as a tetramethoxy silane, its (partial) condensate or their mixture, (c) represents a curing catalyst, and (d) represents a solvent (50wt.% or above of PVA soluble solvent).
Patent•
27 Apr 1995
TL;DR: In this article, a method of coating steel is disclosed, which method comprises applying to the steel a resin composition comprising 55 to 90% by weight of a high-pressure low density polyethylene which has a melt flow rate determined at 190°C under a load of 2.16 kg of 0.5 to 10.0 g/10 min.
Abstract: A method of coating steel is disclosed, which method comprises applying to the steel a resin composition comprising :
(A) 55 to 90% by weight of a high-pressure low density polyethylene which has a melt flow rate determined at 190°C under a load of 2.16 kg of 0.1 to 3.0 g/10 min. and a density of from 0.915 g/cm 3 to 0.930 g/cm 3 , and (B) 45 to 10% by weight of an ethylene-a-olefin copolymer which has a melt flow rate determined at 190°C under a load of 2.16 kg of 0.5 to 10.0 g/10 min., a density of 0.895 to 0.920 g/cm 3 , and has only one endothermic peak as determined with DSC, and the temperature of the top of said endothermic peak falls within the range of 70 to 115°C, and in which the endotherm in the temperature range of 70 to 115°C is 90% or more to the total endotherm. A laminate comprising a steel substrate coated by the method of the invention has excellent corrosion resistance, abrasion resistance, chemical resistance and processability, a laminated surface with low stickiness and high hardness, and improved impact strength at low temperatures.
Patent•
23 May 1995
TL;DR: In this paper, the authors proposed a method to obtain the composition suitable for a coating without using any organic solvent, capable of forming a colorless transparent coating film having good water resistance, chemical resistance and adhesion, by combining a specific molecular weight formaldehyde condensation product as a part of its components.
Abstract: PURPOSE:To obtain the composition suitable for a coating without using any organic solvent, capable of forming a colorless transparent coating film having good water resistance, chemical resistance and adhesion, by combining a specific molecular weight formaldehyde condensation product as a part of its components. CONSTITUTION:A water-based resin composition contains as a part of its components, a condensation product of formaldehyde with 1 mole of a phenolic compound and 0.5-0.05 mole of an aromatic aminosulfonic acid, having an average molecular weight of 2000-500000. Also the composition contains the condensation product with one mole of a bisphenol and 0.75-0.05 mole of the aromatic amino acid, having an average molecular weight of 2000-50000. The bisphenol is expressed by the formula (wherein, X is CH2, SO2, O, etc.). The formaldehyde condensation product of 100wt.pt. is used by combining with 5-200wt.pt. of a component containing a functional group capable of reacting with amino group, methylol group, etc., a water-based melamine resin, a water-based epoxide resin, a water-based urethane resin or a water-based blocked isocyanate. This composition is used for an ink, a coating material, etc.
Patent•
11 Jul 1995
TL;DR: In this article, a composition consisting of a compound having at least one oxetane ring in the molecule and a cationic polymerization initiator and curable by actinic radiation is irradiated with actinic radiation in an atmosphere of nitrogen.
Abstract: PURPOSE:To produce a cured material more quickly without detriment to physical properties, such as hardness, tensile strength, elongation, heat resistance and chemical resistance. CONSTITUTION:A composition consisting of a compound having at least one oxetane ring in the molecule and a cationic polymerization initiator and curable by actinic radiation is irradiated with actinic radiation in an atmosphere of nitrogen.
Patent•
19 Dec 1995
TL;DR: In this article, a heat-resistant and flame-retardant pasty composition is presented, which is composed of a polyamidesimide resin solution having >= 0.2dl/g logarithmic viscosity, an inorganic fine particle and a colored pigment.
Abstract: PURPOSE:To obtain a heat-resistant and flame-retardant pasty composition excellent in heat resistance, flame retardancy, flexibility, chemical resistance and adhesion and useful especially as a coating material for electronic components and a coating material for electrode materials at low cost. CONSTITUTION:This heat-resistant and flame-retardant pasty composition is composed of (A) a polyamidesimide resin solution having >=0.2dl/g logarithmic viscosity, (B) an inorganic fine particle and (C) a colored pigment and the weight ratio of the respective components is (A)/(B)/(C)=100/1 to 3000/0.05 to 20 on solid base. The degree of thixotropy of this pasty composition is >=1.2. In addition, a coating material for electronic components and a coating material for electrode materials respectively containing this heat-resistant and flame-retardant pasty composition are provided.
Patent•
29 Aug 1995
TL;DR: A polyamide compsn. comprises 100 pts. as discussed by the authors, which is obtd. from a dicarboxylic acid component contg. 60-100 mol% 1,9-nonanediamine and has an intrinsic viscosity [eta] measured in conc. sulfuric acid at 30 deg.C of 0.4-3.0 di/g.
Abstract: PURPOSE:To obtain a polyamide compsn. excellent not only in resistance to heat aging but also in heat resistance, low water absorption properties, resistance to hot water, and chemical resistance. CONSTITUTION:A polyamide compsn. comprises 100 pts.wt. polyamide which is obtd. from a dicarboxylic acid component contg. 60-100 mol% terephthalic acid and a diamine component contg. 60-100 mol% 1,9-nonanediamine and has an intrinsic viscosity [eta] measured in conc. sulfuric acid at 30 deg.C of 0.4-3.0 di/g, 0.01-1 pt.wt. copper compd., 0.01-5 pts.wt. alkali metal halide compd., and 0.05-5 pts.wt. org. stabilizer.
Patent•
09 May 1995
TL;DR: In this article, a zinc-containing water-based inks for printing on plastic films is described. But it is not shown how to use acrylic latex binders for this purpose.
Abstract: The invention relates to ink binders. In particular, the invention relates to acrylic latex binders for use in preparing zinc-containing water-based inks for printing on plastic films. Inks containing these binders exhibit increased chemical resistance to commonly-used cleaning formulations and excellent heat resistance and water-crinkle resistance properties.
Patent•
[...]
07 Mar 1995
TL;DR: In this paper, a water blocking sheet adapted to a waste disposal plant is constituted of a sheet layer made of a soft vinyl chloride type resin, an adhesive layer and a sheet layers made of an olefinic resin.
Abstract: PURPOSE:To obtain a water blocking sheet excellent in weatherability, oil resistance, chemical resistance and execution properties by providing a sheet layer made of a soft vinyl chloride resin, an adhesive layer and a sheet layer made of an olefinic resin such as high density polyethylene to combine the respective merits of the respective layers. CONSTITUTION:A water blocking sheet adapted to a waste disposal plant is constituted of a sheet layer made of a soft vinyl chloride type resin, an adhesive layer and a sheet layer made of an olefinic resin. The olefinic resin is composed of high density polyethylene. The vinyl chloride resin is composed of a vinyl chloride resin or a vinyl chloride copolymer of vinyl chloride and a monomer copolymerizable therewith. The olefinic resin is composed, for example, of high density polyethylene or a resin having flexibility and oil resistance. The adhesive is composed of an acrylic resin, etc. By this constitution, the merits of the respective layers are combined to obtain the water blocking sheet excellent in weatherability, oil resistance, chemical resistance and execution properties.
Patent•
21 Dec 1995
TL;DR: In this paper, the problem of obtaining a self-crosslinkable polymer emulsion composition which can give a coating film having a high crosslinking degree and being excellent in toughness, heat resistance, chemical resistance, water resistance, weather resistance, etc., at relatively low temperatures was addressed.
Abstract: PROBLEM TO BE SOLVED: To obtain a self-crosslinkable polymer emulsion composition which can give a coating film having a high crosslinking degree and being excellent in toughness, heat resistance, chemical resistance, water resistance, weather resistance, etc., at relatively low temperatures by modifying a polymer emulsion obtained from an ethylenically unsaturated carbonyl monomer (A) and an ethylenically unsaturated monomer (B) with a modifier (C) having a silicone structure and mixing the modified product with a specified semicarbazide curing agent and/or a terminal-blocked product thereof (D). SOLUTION: Component A has a least one also or keto group in the molecule. Component B is exemplified by an acrylic ester. An emulsion obtained by emulsion-polymerizing 0.1-50wt.% component A and 50-99.9wt.% component B in an aqueous medium is modified with component C (e.g. cyclic silane). The modified product is mixed with component D represented by formula I (wherein R is a 2-20C alkylenediisocyanate or the like; R is a 2-20C alkylene or the like; R is H or the like; (n) is 0 or 1; and (l) and (m) are each 0 or a positive integer).
Patent•
04 Dec 1995
TL;DR: In this paper, a polyvinyl alcohol (PVA), a (partial) hydrolyzate of an alkoxysilane (eg tetramethoxylsilane) represented by the general formula: R 1 n Si(OR 2 ) 4-n (wherein R 1 is a 1-4C alkyl, vinyl or an organic group having a methacryloxy group or the like; R 2 is an integer of 0-2), a condense thereof or a mixture thereof, a curing catalyst and a solvent (50wt
Abstract: PROBLEM TO BE SOLVED: To obtain a coating composition which can form a transparent coating film not corrosive to a coating equipment and excellent in gas barrier properties, adhesion, heat resistance, chemical resistance, water resistance and flexibility SOLUTION: This coating composition comprises (A) a polyvinyl alcohol (PVA), (B) a (partial) hydrolyzate of an alkoxysilane (eg tetramethoxysilane) represented by the general formula: R 1 n Si(OR 2 ) 4-n (wherein R 1 is a 1-4C alkyl, vinyl or an organic group having a methacryloxy group or the like; R 2 is a 1-4C alkyl; and (n) is an integer of 0-2), a condense thereof or a mixture thereof, (C) a curing catalyst and (D) a solvent (50wt% or above solvent in which the PVA is soluble) The A/B ratio should be 5/1 to 2/1 by weight, and the pH of the composition should the be adjusted to 7-11 (at 25°C) COPYRIGHT: (C)1997,JPO
Patent•
13 Jun 1995
TL;DR: In this paper, a copolymer comprising (A) 72-96wt.% of methyl methacrylate units, (B) 1 to 10wt.%.% of maleimide units such as N-methylmaleimide or N-phenylmaleimides, (C) 2 to 8wt.%).
Abstract: PURPOSE:To obtain a resin which is useful in lighting covers, car parts or the like because of its excellent optical properties, mechanical properties, weathering resistance, moldability, chemical resistance and water absorption, by heat-treating a specific methacryl copolymer at a specific temperature. CONSTITUTION:A copolymer comprising (A) 72-96wt.% of methyl methacrylate units, (B) 1 to 10wt.% of maleimide units such as N-methylmaleimide or N- phenylmaleimide, (C) 1 to 10wt.% of aromatic vinyl units such as styrene or methylstyrene and (D) 2 to 8wt.% of methacrylic acid units where A+B+C+D =100wt.% is heat treated in an extruder at 200-300 deg.C to give the objective resin.
TL;DR: In this paper, the chemical resistance of solventless and high-solid epoxy compositions has been studied and the compositions have been cured at normal temperature and the chemical resistivity has been analyzed as a function of various resin types, solvent types and hardener types.
Patent•
19 Dec 1995
TL;DR: In this paper, a compound of formula I or formula II was obtained by reacting a fatty acid having naphthyl group with 0-phenylene diamine, and the compound was formed by bringing an aqueous solution containing the compound as an active ingredient into contact with metal surface.
Abstract: PURPOSE:To obtain a new compound useful as a protecting agent for metal surface, especially, as a water soluble protecting agent capable of forming a coating film excellent in rust roofing, heat resistance, moisture resistance and chemical resistance on metal surface in printed-wiring board. CONSTITUTION:A compound of formula I or formula II [R1 and R3 are each H, a lower alkyl, a halogen, an amino, a lower alkoxy, hydroxy, cyano, benzoyl, etc.; R2 is an alkylene; (n) is 0 or >=1], e.g. 2-naphthylbenzimidazole. The compound of formula I is obtained by reacting a fatty acid having naphthyl group with 0-phenylene diamine. The compound of formula II is obtained by reacting a fatty acid having naphthyl group with ethylenediamine. The excellent coating film is formed by bringing an aqueous solution containing the compound of formula I or II as an active ingredient into contact with metal surface. The coating film has good wetting property and spreading property of low melting point cream soldering, good soldering up property and wetting property after high temperature reflow treatment and is especially effective in mounting electronic parts on the surface of a printed-wiring board.
Patent•
30 May 1995
TL;DR: In this article, a paving material composition containing a prepolymer having terminal isocyanate group, a specific compound and an inorganic powder, quickly curable at normal temperature to give a pavement film having excellent chemical resistance, impact resistance, surface finish and useful for the finishing of floor, corridor, etc.
Abstract: PURPOSE:To obtain a urethane paving material composition containing a prepolymer having terminal isocyanate group, a specific compound and an inorganic powder, quickly curable at normal temperature to give a pavement film having excellent chemical resistance, impact resistance, surface finish, etc., and useful for the finishing of floor, corridor, etc. CONSTITUTION:This composition contains (A) a prepolymer having isocyanate group on the terminal, (B) a compound containing a polyol such as butylene glycol and poly(oxypropylene) polyol and (C) aluminum oxide powder or silicon oxide powder having a BET specific surface area of >=100m /g. Preferably, the composition is composed of the component A and a dispersion of the component C in the component B.