Showing papers on "Chemical resistance published in 1994"

Modifications of poly(alkylene cyclohexanedicarboxylate) blends

Abstract: Compositions are provided which comprise (A) a polyester resin which comprises the reaction product of at least one straight chain, branched, or cycloaliphatic C₂-C₁₀ alkane diol or chemical equivalent thereof, and a cycloaliphatic diacid or chemical equivalent thereof; and (B) an effective impact strength or tensile property modifying amount of a substantially amorphous copolymer resin. These compositions are homogeneous and exhibit excellent light stability, chemical resistance, particularly to gasoline and similar automotive chemicals, excellent impact strength even at low temperatures and excellent tensile properties.

Wood enhancement treatments. I: Impregnation of southern yellow pine with melamine-formaldehyde and melamine-ammeline-formaldehyde resins

Abstract: Southern yellow pine (SYP) was impregnated with melamine-formaldehyde (MF) or melamine-ammeline-formaldehyde (MAF) resins The dimensional stability, strength properties, weathering, fire resistance and chemical resistance of the impregnated wood were examined The wood treated with two commercial MF resins or with a synthesized MAF resin exhibited greatly enhanced dimensional stability, fire resistance and resistance to weathering The chemical resistance increased moderately

Synthesis of zinc‐containing epoxy resin

Abstract: Novel epoxy resins containing zinc acrylate have been synthesized by reacting zinc acrylate with bisphenol-A and an excess of epichlorohydrin. Parameters such as epoxy equivalent weight, hydroxyl content, and hydrolyzable chlorine content have been estimated. These resins, characterized by IR, 1H-NMR, and 13C-NMR, have been evaluated by thermal analysis. Curing was carried out with polyamide at 130°C for 24 h. Cured resins have improved thermal and chemical resistance. The reaction follows first-order kinetics with activation energy 86 and 34 kJ mol−1 in the presence and absence of zinc acrylate. The role of zinc, which increases epoxidation due to formation of complex with bisphenol-A, has been discussed. © 1994 John Wiley & Sons, Inc.

Adhesive and mechanical properties of reactive polysulfone modified epoxy resins

Abstract: The diglycidyl ether of bisphenol-A epoxy resin (EPON 828®) was cured with 4,4′-diaminodiphenylsulfone (DDS) and, optionally, an animophenyl functional reactive polyethersulfone (R-PES, ⟨ Mn ⟩=10k) as a co-curing agent. Commercial polysulfone, Udel® P-1700, was also utilized to afford epoxy-Udel® blends (or semi-IPNs). Cured epoxy polymers were subjected to Tg determinations, plane strain fracture toughness (KIC) tests, adhesive bond strength measurements, tensile tests and chemical resistance studies. The morphologies of the fractured samples were studied by SEM and correlated to the property changes. Only the reactive polysulfone modification improved both fracture toughness and adhesive properties without detracting from the good mechanical properties and chemical resistance.

Polyamide composition for molding material

Abstract: PURPOSE:To obtain a polyamide composition reduced in water absorbency and improved in heat resistance, mechanical strengths, toughness, impact resistance, chemical resistance, hot-water resistance, lightweightness and moldability by mixing a specified polyamide with a powdery or fibrous filler. CONSTITUTION:This composition comprises 100 pts.wt. polyamide made from a dicarboxylic acid component comprising 60-100mol% terephthalic acid and a diamine component comprising 60-100mol% 1,9-nonanediamine and having an intrinsic viscosity (in concentrated sulfuric acid at 30 deg.C) of 0.4-3.0dl/g and 0.5-200 pts.wt. powdery filler having a mean particle diameter of 1-200mum and selected from silica (alumina), alumina, talc, graphite, TiO2, MoS2 and polytetrafluoroethylene or a fibrous filler having an average length of 0.1-200mm and selected from polyamide, glass, carbon and boron fibers.

Thermoplastic resin composition and laminate comprising the same

Abstract: A thermoplastic resin composition comprising (i) 5 to 80% by weight of a polyamide resin, (ii) 15 to 90% by weight of a fluororesin and (iii) 1 to 80% by weight of a fluororubber having a tensile modulus at ordinary temperature of not more than 500 Kg/cm2, and a laminated material having a layer formed from the thermoplastic resin composition have excellent chemical resistance.

Vacuum sucking device and its manufacture

Abstract: PURPOSE:To improve mechanical strength, chemical resistance and heat resistance as well as to have hardness in the same degree on any part of a sucking plate by forming both of a porous part constituting the sucking plate and a solid part firmly surrounding the porous part integrally of ceramics of the same composition. CONSTITUTION:As a sucking plate 1 to be furnished on a vacuum sucking device is constituted of a porous part 4 making an sucking part 2 and a solid part 5 making a support part 3 which are integrally formed of ceramics of the same composition, the porous part 4 has hardness of the solid part 5 and is excellent in mechanical strength, chemical resistance and heat resistance. Consequently, a placing surface 1a can be easily made a smooth and flat surface, and accordingly, it is possible to firmly suck and fix a work piece, and at the same time, the sucking part 2 never falls from the support part 3 by suction force. Additionally, even when cleaning is repeated, ceramic particulates never fall and strength deterioration is not caused even if it is used under high temperature, and accordingly, it is possible to use it for a long period of time.

Molding material composed of vinylated cyclic hydrocarbon polymer

Abstract: PURPOSE:To provide the subject molding material composed of a vinylated cyclic hydrocarbon polymer having specific intrinsic viscosity, resin content and residual transition metal atom content, etc., having excellent heat-resistance and chemical resistance and useful for medical material, electrically insulating material, material for the treatment of electronic parts, etc. CONSTITUTION:A polystyrene is produced by dissolving styrene, etc., in toluene, adding azoisobutyronitrile as a polymerization catalyst, reacting the components at 80 deg.C for 5hr under stirring, pouring the reaction solution into a large amount of methanol to precipitate the polymer, separating the polymer by filtration and drying under reduced pressure. The polystyrene is dissolved in a mixed solvent consisting of tetrahydrofuran and cyclohexane, a nickel catalyst supported on diatomaceous earth is added to the solution and the polymer is hydrogenated by reacting in an autoclave at 200 deg.C under hydrogen pressure of 50kg/cm for 5hr to obtain the objective molding material composed of a vinylated cyclic hydrocarbon polymer (or its hydrogenated product) having an intrinsic viscosity [eta] of 0.1-20dl/g measured in toluene at 25 deg.C and a residual transition metal atom content of <=1ppm and containing <=1wt.% of resin component having a molecular weight of <=2,000.

Thermoplastic resin composition and laminate made therefrom

Abstract: A thermoplastic resin composition comprising (i) 5-80 wt. % of a polyamide resin, (ii) 15-90 wt. % of a fluororesin, and (iii) 1-80 wt. % of a fluororubber having a tensile modulus of 500 kg/cm2 or less at ordinary temperature. A molding having a layer formed from the above composition has an excellent chemical resistance.

Black-colored, laser writable blends of carbonate polymer and polyester

Abstract: Laser-writable, black-colored blends of carbonate and polyester resins are provided by the incorporation of a black colorant formulation comprising carbon black and a fatty acid metal salt. Zinc stearate is a preferred fatty acid metal salt. The black colored resin blends can be inscribed using standard YAG lasers and maintain an excellent balance of other properties including surface aesthetics, physical properties, heat resistance, chemical resistance and processability.

Crosslinking plastisol and process for crosslinking vinyl chloride resin

Abstract: A crosslinking plastisol comprising (1) an epoxy group-containing vinyl chloride resin, (2) a triazine compound, (3) a plasticizer, and (4) an optional amino group- and/or thiol group-containing silane compound. The plastisol is capable of providing a shaped article or a laminated article, which has good heat distortion resistance, chemical resistance, resistance to whitening due to water, adhesion, transparency and thermal resistance on processing.

Ceramic circuit board having a thermal conductivity substrate

Abstract: According to this invention, there is disclosed a thermal conductivity substrate which includes an aluminum nitride sintered body and a coating layer formed on the body of aluminum phosphate and having a surface roughness of 1 μm or less, and which has excellent humidity resistance and chemical resistance.

Hydrogenated norbornene-base ring-opening polymer, process for producing the same, and use thereof

Abstract: A resin which has a high refractive index, is excellent in the characteristics inherent in hydrogenated norbornene-base ring-opening polymers, such as heat resistance, clarity, low birefringence, weathering resistance, lightfastness, low water absorptivity, moisture resistance, low permittivity, low dielectric loss and chemical resistance, and can be used as optical material, medical supply material and material for treating electronics components. It is produced by conducting ring-opening polymerization of a norbornene monomer having an aromatic ring structure, e.g. 5-phenyl-2-norbornene, and hydrogenating at least 95 % of the unsaturated bonds in the main chain while leaving at least 80 % of the aromatic ring structures intact in the presence of a catalyst comprising a combination of a transition metal compound and an alkylmetal compound.

Gamma radiation sterilizable acrylic polymer

Abstract: Provided are methyl methacrylate polymers admixed with particular polyalkylene glycols, ethers or esters, optionally with BHT, which show good chemical resistance, as well as maintenance of optical properties and minimal yellowing on exposure to sterilizing gamma radiation.

Hydrogenated norbornene ring-opening polymerization product, a process for production thereof and uses thereof

Abstract: A resin obtained by subjecting a norbornene type monomer having an aromatic ring structure (e.g. 5-phenyl-2-norbornene) to ring-opening polymerization and hydrogenating 95% or more of the unsaturated bonds in the backbone structure of the resulting polymer by the use of a catalyst composed of a combination of a transition metal compound and an alkyl metal compound, while leaving 80% or more of the aromatic ring structures, which resin has not only a high refractive index but also characteristics of a hydrogenated norbornene ring-opening polymerization product, i.e., excellent heat resistance, transparency, low birefringent properties, weather resistance, light resistance, low water absorption properties, moisture resistance, small dielectric constant, small dielectric loss, chemical resistance, etc., said resin being usable in optical materials, medical tools and materials, tools and materials for treating electronic parts, etc.

Antibacterial inorganic coating composition

Abstract: PURPOSE: To obtain an antibacterial inorganic coating composition which can provide a thin coating film made proof against formation of fine crazings, improved in staining resistance and chemical resistance and having high covering power and excellent heat resistance by mixing specified components with each other. CONSTITUTION: This composition is prepared by adding calcium silicate or zinc phosphate (B) to an alkali metal silicate (A), mixing the obtained mixture with a natural glass (C), as an inorganic filler, based on colemanite (2CaO, 3B2 O3 , 5H2 O) or ulexite (Na2 O, 2CaO, 5B2 O3 , 16H2 O) in the form of fine flakes having a mean particle diameter of 30μm and a thickness of 1.0μm or below and adding a small amount of an antibacterial metal oxide (D) such as a silver powder or a copper powder. The mixing ratio is usually such that 100 pts.wt. component A is mixed with 5-70 pts.wt. component B, 5-200 pts.wt. component C and 0.5-4 pts.wt. component D. This composition may further contain silicon carbide and ultrathin glass flakes of a thickness of 0.5μm or below.

Synthesis and studies of egyptian bagasse pith phenol formaldehyde cationic exchangers

Abstract: The article is concerned with a simple method for preparing cationic resins from polycondensation of Egyptian bagasse pith (as a source of cheap and renewable material) with phenol and paraformaldehyde as a cross-linking agent. Optimum principal reaction conditions of the preparation and properties are determined and compared with resin without bagasse pith content. The Synthesized resins are stable in water, organic solvents, thermal treatment, and mineral acids (1M). The sample having a cation exchange capacity up to 3.92 meq g−1 of dry resins are being introduced as new cationic exchangers. The synthesized resins are used in the study of the possible separation of univalent cations. The rational thermodynamic equilibrium constants (In K) are calculated for Li+ −Na+ exchanges on the resins having a various amount of bagasse pith. The thermodynamic parameters are computed and suitable explanations are described. © 1994 John Wiley & Sons, Inc.

Coating resin composition

Abstract: PURPOSE:To obtain a coating resin composition which can give a cured film excellent in hardness, elasticity, weather resistance, chemical resistance, gloss, solvent resistance, staining resistance, processability, etc., by compounding a specified (meth)acrylic resin with a specified curing agent. CONSTITUTION:This resin composition comprises a (meth)acrylic resin containing a structure of the formula [wherein R1 is H or CH3; R2 is 2-6C alkylene; (m) is 3-8; n1 is 10-100; n2 is 0-9; (x) is 1 or greater; and (y) is 0 or greater] in the main chain and having a hydroxyl value of 5-100 and a molecular weight of 3000-300000 and a curing agent (e.g. Desmodur BL-3175) which can cure the (meth)acrylic resin by reaction with the hydroxyl groups of the resin to form into a cured film.

Coating material composition and production of abrasion resistant article using the same

Abstract: PURPOSE:To obtain a coating material composition capable of readily curing by irradiation of active energy beam and forming crosslinked and cured film excellent in abrasion resistance, scratch resistance, heat resistance, chemical resistance, durability and adhesiveness to substrate on the surface of various substrates. CONSTITUTION:This coating material composition consists of (A) a crystalline laminated structure filter composed of a tetrahedral layer structure containing an atom obtained by substituting Si atoms or a part of Si atoms with at least one atom selected from Al and Fe as the center atom and an octahedral layer structure containing at least one metal selected from Mg, Al, Ni, Co, Cu, Mn, Fe, Li, V and Zr as the center atom, (B) a compound having one or more (meth) acryloyl groups in the molecule and (C) an active energy line-sensitive radical polymerization initiator.

Anticorrosive resin coating structure in metal pipe

Abstract: PURPOSE: To provide an anticorrosive resin coating structure excellent in corrosion resistance, weather resistance and chemical resistance to be also mechanically tough with also a high heat resistant temperature. CONSTITUTION: As necessary, a steel pipe 1 having a copper layer is formed. Next on a peripheral surface of the steel pipe 1, a zinc or zinc nickel plating layer 3 is formed, and on this inc or zinc nickel plating layer 3, a chromate layer 4, composed of a trivalent chrome compound, is formed. As necessary through an epoxy resin intermediate layer 5, at least a single layer, polyvinyl fluoride or polyvinylidene fluoride layer 6 is formed.

Thermoplastic saturated norbornene-based resin composition, optical material, medical equipment material and electrical insulating material composed thereof

Abstract: PURPOSE:To obtain the subject composition, excellent in heat, moisture and chemical resistance, transparency, electrical insulating properties, etc., and further weather resistance by adding a fluorophosphonite-based antioxidant to a thermoplastic saturated norbornene-based resin. CONSTITUTION:The objective composition is obtained by adding (B) 0.01-5 pts.wt., preferably 0.03-0.5 pt.wt. fluorophosphonite-based antioxidant (e.g. diphenyl fluorophosphonite or di-2-propylphenyl fluorophosphonite) to (A) 100 pts.wt. thermoplastic saturated norbornene-based resin (e.g. a hydrogenated ring opening polymer of a norbornene-based monomer or an addition type polymer thereof). Furthermore, the molecular weight of the component (A) is preferably 10000-200000 number-average molecular weight measured by the gel.permeation.chromatographic analysis. In the case of hydrogenation, the hydrogenation ratio is preferably regulated to >=99% for improving the weather resistance.

High molecular weight polyarylene sulfide for chemical pipeline

Abstract: PURPOSE: To provide a low-cost high molecular weight polyarylene sulfide which provides a chemical pipeline excellent in mechanical strength such as impact resistance and chemical resistance by itself. CONSTITUTION: In an organic amide solvent, 0.2-1.0mol% of polyhalaromatic compound is reacted to an alkaline metallic sulfide, a dihalaromatic compound, and a charged alkaline metallic sulfide. A vapor phase part in a reaction can is cooled during the reaction so as to condense a part of the vapor phase in the reaction can, which is refluxed to a liquid phase so as to manufacture a high molecular weight polyarylene sulfide for a chemical pipeline. COPYRIGHT: (C)1996,JPO

Cured product of epoxy resin having high heat resistance

Abstract: PURPOSE:To obtain a high-heat resistant epoxy resin cured product excellent in moisture resistance, mechanical strength, toughness, abrasion resistance and chemical resistance and useful as a sealing material, etc., for electrical and electronic parts, etc., by curing a specific epoxy resin with a specific polyhydric hydroxy compound. CONSTITUTION:The objective cured product is obtained by curing an epoxy resin expressed by formula I [R and R are H or methyl; G is glycidyl; n is >=0) with a polyhydric hydroxy compound expressed by formula II [A is formula III (R3 and R4 are H or 1-6C hydrocarbon) or formula IV].

Production of tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer

Abstract: PURPOSE:To obtain a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer of high heat resistance, solvent resistance and chemical resistance by using a polymerization medium with reduced environmental disruption. CONSTITUTION:A production process for a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer wherein a mixed polymerization medium of water and CF3CF2CHCl2 and a peroxide polymerization initiator are used.

Thermosetting resin composition

Abstract: PURPOSE:To obtain a resin composition having impact resistance and chemical resistance, especially high resistance to oil, comprising a composition composed of a styrenic resin and a polypropylene-based resin. CONSTITUTION:100 pts.wt. resin composition comprising (A) 5-95 wt.% polystyrene resin and (B) 95-5 pts.wt. polypropylene-based resin are blended with (C) 0.5-30 pts.wt. hydrogenated block copolymer obtained by hydrogenating >=70wt.% aliphatic double bond of a styrene-butadiene-styrene block copolymer (SBS) having >=70wt.% 1,2 vinyl bond amount of butadiene block to give a composition.

Solder resist ink composition and its cured material

Abstract: PURPOSE:To provide the subject composition containing an epoxy resin having a specified structure, capable of forming a cured material exhibiting a high heat distortion temperature, excellent in heat resistance, moisture resistance, plating resistance and chemical resistance, exhibiting a high hardness and low bleeding. CONSTITUTION:The objective composition contains an epoxy resin of formula I (R1 and R2 are each a residue having a structure obtained by removing hydroxyl groups from a compound having two or more phenolic hydroxyl groups; Z1 and Z2 are each 0 or >=1, provided that Z1+Z2 >=1 ; M is H or glycidyl; (n) is >=1; Provided that M is glycidyl in the case of n = 1 or that one or more of M are glycidyls in the case of n >=2). The resin of formula I is obtained, e.g. by reacting an alcoholic hydroxyl group of a compound represented by formula II with epichlorohydrin in the presence of an alkaline metal hydroxide in dimethylformamide. In addition, preferably dicyanamide, 2-ethyl-4-methylimidazole, etc., is used as the curing agent to be blended in this composition.

Water-based coating composition for metal surface treatment

Abstract: PURPOSE:To provide a water-based coating composition for forming a coating film excellent in all of corrosion resistance, surface protection, chemical resistance, corrosion resistance after bending, adhesion of adhesive, and adhesion to an electrodeposition coating material on the surface of a steel sheet CONSTITUTION:The coating composition comprises 100 ptswt (in terms of solid) aqueous resin dispersion, 05-20 ptswt tannic acid, gallic acid, protocatechuic acid or a mixture thereof an 10-100 ptswt (in terms of SiO2) silica hydrosol having a specific surface area of 100m /g or above, and contains a solid matter based on the above resin and tannic acid, gallic acid, protocatechuic acid or a mixture thereof, and the silica in a concentration of 5-50wt%

Lubricating material using ultrafine quartz particle

Abstract: PURPOSE:To obtain the most effective lubricating material using spherical, nontoxic, sterile and highly dispersible ultrafine quartz particles having high mechanical strength, heat resistance and chemical resistance, which are produced from high-purity silica glass CONSTITUTION:High-purity silica glass is irradiated with high-temperature laser beams of about 35000-40000 degC, the evaporated gas generated thereby is recovered and cooled to obtain ultrafine quartz particles 10a, 10b, 10c as mixed spherical particles having nonuniform diameters around ca02-04mum A mixture of the ultrafine quartz particles 10a, 10b, 10c with ultrafine fluororesin particles 12 of low friction resistance is added to a lubricating oil

New curable polyphenylene ether resin composition

Abstract: PURPOSE:To provide the subject composition containing a polyphenylene ether resin having unsaturated group, triallyl (iso)cyanurate and silica, giving a cured product having low thermal expansion coefficient and excellent dielectric characteristics, strength, chemical resistance and heat-resistance and useful for dielectric material, etc. CONSTITUTION:The objective curable polyphenylene ether resin composition exhibiting low thermal expansion coefficient and excellent dielectric characteristics, strength, chemical resistance and heat-resistance by curing can be produced by compounding (A) 98-40 pts.wt. of a polyphenylene ether resin containing unsaturated group, (B) 2-60 pts.wt. of triallyl isocyanurate and/or triallyl cyanurate (the sum of A and B is 100 pts.wt.), (C) 10-400 pts.wt. (based on 100 pts.wt. of A+B) of silica and (D) 5-90 pts.wt. (based on 100 pts.wt. of the sum of A to D) of a base material (e.g. roving cloth) and mixing the compounded composition by a Henschel mixer.