Showing papers on "Chemical resistance published in 1996"

Borosilicate glass of high chemical resistance and low viscosity which contains zirconium oxide and lithium oxide

Abstract: The invention relates to a borosilicate glass of high chemical resistance and low viscosity which contains zirconium oxide and lithium oxide. The borosilicate glass has hydrolytic resistance (in accordance with DIN ISO 719), class 1 acid resistance (in accordance with DIN 12116), and class 1 alkali resistance (in accordance with DIN ISO 659), and with a low operating temperature V A of between 1180° C. to 1230° C. and a coefficient of thermal expansion α 20/300 of 4.9×10 -6 K -1 . The borosilicate glass has the composition (in % by weight, based on oxide): SiO 2 73-75; B 2 0 3 7-10; Al 2 0 3 5-7; ZrO 2 1-3; Li 2 0 0.5-1.5; Na 2 0 0-10; K 2 0 0-10; MgO 0-3; CaO 0-3; BaO 0-3; SrO 0-3; ZnO 0-3; ratio of SiO 2 /B 2 0 3 ≧7.5; Σ SiO 2 +Al 2 0 3 +ZrO 2 80-83 and Σ MgO+CaO+BaO+SrO+ZnO≦3, and fluorides 0-3. The glass is particularly suitable for use as a versatile primary packaging material for pharmaceuticals, for example as ampule glass.

Resin transfer molding process for composites

Abstract: A laminate has at least two layers, at least one of which comprises a polymer having more than one perfluorocyclobutane group. Such polymers impart qualities of environmental or protection, chemical and solvent resistance, hydrolytic stability, lubricity, low dielectric, hydrostatic stability, weatherability, flame resistance, chemical resistance, hydrolytic stability, lubricity, environmental protection, scratch resistance, solvent resistance, surface passivation, water repellancy, lower surface refractive index, lower surface coefficient of friction, fluid barrier properties, oil repellancy, thermal stability, and/or reduced moisture pick-up. Additionally, the coatings are optically clear, easy to apply either neat, in a solvent or otherwise, have relatively low cure temperatures for their temperature resistance, and exhibit insulating and planarizing capabilities.

Coating composition and optical member

Abstract: PROBLEM TO BE SOLVED: To prevent the occurrence of interference fringes and improve the marring resistance, surface hardness, wear resistance, flexibility, transparency, antistatic properties, dyeability, heat resistance, chemical resistance, tight adhesion, etc., by using a specified silylated substance and specified titanium dioxide/ tin oxide composite colloid particles as the constituents. SOLUTION: At least one silylated substance selected from (partially hydrolyzed) organosilicon compounds of formula I [wherein R and R are each (halogenated) alkyl, (halogenated) aryl, alkenyl, or an organic group having an epoxy, (meth)acryloyl, mercapto, amino, or cyano group and bound to an Si atom through an Si-C bond; R is a 1-8C alkyl, alkoxyalkyl, or acyl; and a and b are each 0 to 2, provided that a+b=(0 to 2)] and formula II (wherein R is a 1-5C alkyl; X is a 1-4C alkyl, or acyl; Y is methylene, or a 2-20C alkylene; and c is 0 or 1), in an amount of 100 pts.wt. is compounded with titanium dioxide/tin oxide composite colloid particles having a primary particle diameter of 2-20nm, in an amount of 1-500 pts.wt., preferably 100-300 pts.wt.

Phenolic resin compositions with improved impact resistance

Abstract: Phenolic siloxane composition are prepared by 1) combining phenol with an aldehyde and an alkoxy or silanol-functional silicone intermediate, 2) combining a phenolic novolac resin with a formaldehyde donor and an alkoxy or silanol-functional silicone intermediate or 3) combining a phenolic resole resin with an alkoxy or silanol-functional silicone intermediate. Catalysts to facilitate the formation of a phenolic resin, the condensation of the phenolic resin and the hydrolysis and/or condensation of the silicone intermediate can optionally be added. The resulting composition comprises an IPN of siloxane polymers and phenolic polymers and has flame, heat and chemical resistance equal to or exceeding conventional phenolic resins and improved impact resistance, tensile strength, flexural modulus and density.

Thermosetting compositions, methods of coating and coated articles

Abstract: A thermosetting composition which comprises (A) an epoxy group-containing modified polyester polymer comprising a structural moiety of (a) a carboxyl group-containing polyester resin having a number average molecular weight of 1,500 to 50,000 and a resin acid value of 2 to 30 mgKOH/g and a structural moiety of a polymer of (b) an epoxy group-containing vinyl monomer, the carboxyl groups and a part of the epoxy groups being bonded in an equivalent ratio of the carboxyl groups in the component (a) to the epoxy groups in the polymer of the component (b) of 0.1 or less, and having an epoxy equivalent weight of 200 to 2,000 g/mol, and (B) a compound having two or more functional groups which are blocked by a vinyl ether, vinyl thioether or heterocyclic group carrying oxygen or sulfur as the heteroatom and having a double bond of the vinyl type. The composition can give cured articles excellent in hardness, chemical resistance, stain resistance, processability, impact resistance, elasticity and weathering resistance and has a good storage stability.

Novel resin-coated metallic pigment and metallic coating material containing the pigment

Abstract: A resin-coated metallic pigment which is prepared by using (A) at least one member selected from among radical-polymerizable unsaturated carboxylic acids, mono- and di-esters of phosphoric acid and phosphonic acid each having a radical-polymerizable double bond and coupling agents each having a radical-polymerizable double bond, (B) a monomer having three or more radical-polymerizable double bonds and (C) a polymerization initiator according to a process characterised by treating a metallic pigment with the component (A) and thereafter forming a resin layer on the surface of the resulting pigment by gradually adding at least one of the components (B) and (C) to cause polymerization and which is excellent in weathering resistance, chemical resistance, gloss and storage stability in aqueous coating materials and permits the formation of a metallic finish; and a metallic coating material containing the resin-coated metallic pigment.

Chlorinated polyvinyl chloride compound having excellent physical, chemical resistance and processing properties

Abstract: The present invention relates to a chlorinated polyvinyl chloride compound and an article made therefrom. The compound comprises a two step CPVC resin, chlorinated polyethylene as well as an impact modifier. The compound exhibits good physical properties, chemical resistance as well as ease of processability.

Material for fluorine-containing coating composition and method for coating by using same

Abstract: To provide a fluorine-containing coating material which gives excellent adhesive strength directly to a substrate such as metal, glass, etc. with maintaining excellent characteristics of the fluorine-containing polymer such as thermal resistance, chemical resistance, non-sticking property and low friction property, and a method for coating the material. The fluorine-containing coating material is prepared by using a fluorine-containing ethylenic polymer having functional group which is obtained by copolymerizing (a-1) 0.05 to 30% by mole of at least one of fluorine-containing ethylenic monomers having any one of functional groups selected from hydroxyl, carboxyl, carboxylate salt group, carboxylate ester group or epoxy and (b-1) 70 to 99.95% by mole of at least one of fluorine-containing ethylenic monomers having no functional group mentioned above.

Polyimide compositions for electrodeposition and coatings formed of the same

Abstract: Aromatic diamines having a carboxylic acid group and various other diamines are reacted with aromatic tetracarboxylic dianhdyrides in organic polar solvents to provide polyimides. Polyimide compositions for electrodeposition which comprise the neutralized salts of the polyimides, water and poor solvents for the polyimides have good keeping quality and when electrodeposited on electrically conductive materials, can form polyimide coats that have high levels of appearance, smoothness and denseness while exhibiting good physical and chemical characteristics in such aspects as heat resistance, electrical insulation and chemical resistance.

Production of porous fluororesin

Abstract: PROBLEM TO BE SOLVED: To produce a porous fluororesin which has an inside structure most suitable for the case where a chemical reaction occurs between two liquid phases through a porous material as in the case of a secondary battery and which is excellent in chemical resistance and long-term durability. SOLUTION: This porous material is produced by forming a matrix consisting of 100 pts.wt. copolymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride, 5-300 pts.wt. ester compound having a boiling point or decomposition point of at least 200 deg.C and 10-150 pts.wt. silicon oxide compound having a mean particle diameter of at most 100μm, and then extracting the ester compound with an organic solvent.

Polystyrene resin composition

Abstract: An SPS-containing resin composition which is improved in heat stability in high-temperature molding without any adverse effect on the excellent characteristics, such as heat resistance, chemical resistance and mechanical strengths, inherent in SPS; and molded articles of SPS improved in the resistance to thermal aging in high-temperature and long-time use. Specifically, a resin composition obtained by adding both a phenolic antioxidant and a phosphorus-containing antioxidant to a syndiotactic polystyrene (SPS); and molded articles thereof. Additional use of an sulfur antioxidant gives a more excellent improvement. The composition may further contain other thermoplastic resins and/or rubbery elastomers, polymers exhibiting compatibility with or affinity for SPS and having polar groups, and/or inorganic fillers.

Thermosetting composition, method of finish coating, and coated articles

Abstract: A thermosetting composition containing (A) an epoxy group-containing modified polyester polymer which consists of (a) a component comprising a carboxyl group-containing polyester resin having a number-average molecular weight of 1,500 to 50,000 and a resin acid value of 2 to 30 mgKOH/g and (b) another component comprising a polymer of a vinyl monomer having an epoxy group, in which a part of the carboxyl groups have been bonded to a part of the epoxy groups by reaction in such a manner as to give an equivalent ratio of the carboxyl groups in the component (a) to the epoxy groups in the polymer of the component (b) of 0.1 or below, and which has an epoxy equivalent of 200 to 2,000 g/mol and (B) a compound having, per molecule, two or more carboxyl groups which are blocked by a vinyl ether, vinyl thioether or heterocyclic group carrying oxygen or sulfur as the heteroatom and having a double bond of the vinyl type. The composition can give cured articles excellent in hardness, chemical resistance, stain resistance, processability, shock resistance, flex resistance and weatherability and has a good storage stability.

Thermoplastic elastomer composition

Abstract: PURPOSE: To obtain the subject composition useful for interior automotive trims, etc., having excellent flexibility, mechanical strength, rubber-like properties, chemical resistance, scratching resistance, appearance and feel, comprising a syndiotactic polypropylene and an ethylene-octene copolymer in a specific ratio. CONSTITUTION: This composition is obtained by blending (A) 10-90wt.% of a syndiotactic polypropylene with (B) 90-10wt.% of an ethylene-octene copolymer and preferably (C) an organic peroxide in a molten state and partially cross- linking. The component A having >=0.75 syndiotactic pendant ratio in the case of a homopolymer, >=0.7 in the case of a copolymer is preferably used. The component B having 0.5-30g/10 minutes MFI and 0.85-0.93g/cm is preferably used. 2,5-Dimethyl-2,5-di-(t-butylperoxy)hexane is preferably used as the component C.

Chemical resistance and tensile properties of epoxy-coated bamboo fibres

Abstract: The chemical resistance and te~oad at break of bamboo fibres (Dendrocalamus striclus) before and after coating with a high performance epoxy resin (Araldite LY 5052/Hardner 5052 system) have been studied. It is observed that the tensile load at break and chemical resistance of bamboo fibres increase on coating, indicating that epoxy resin and bamboo fibres are favourable materials for making the composites.

Resin composition, molding produced using the same, and process for producing the same

Abstract: A resin composition which can impart performances such as excellent mechanical properties and abrasion resistance to a molding while maintaining excellent heat resistance, chemical resistance, surface properties (nontackiness and low abrasion), electrical insulating properties and other properties inherent in fluoropolymers. The composition comprises: (A-1) a fluoroethylenic polymer prepared by copolymerizing 0,05 to 30 % by mole, based on the total amount of the monomers, of at least one fluoromonomer having any one of hydroxyl, carboxyl, carboxylic salt, carboxylic ester, and epoxy groups; and (B-1) an inorganic filler or an insolubilized organic filler, the contents of the components (A-1) and (B-1) being respectively 1 to 99.5 % by weight and 0.5 to 99 % by weight.

Curing agent for resins and resin composition containing the same

Abstract: A curing agent having less odor and providing a cured resin which is excellent in appearance, mechanical properties, water resistance and chemical resistance, and a one-component type humidity-curing resin composition having excellent storage stability and providing a cured matter which is excellent in appearance and physical properties Specifically, provided are polyaminoamide or ketimine obtained by dehydration of 2,5- and/or 2,6-bis(aminomethyl)-bicyclo[221]heptane with carboxylic acids or ketones, a curing agent for epoxy resins using the same and a one-component type humidity-curing epoxy resin or urethane prepolymer composition containing the curing agent

Aqueous resin, its production and aqueous curable resin composition comprising the same

Abstract: PROBLEM TO BE SOLVED: To obtain an aqueous resin excellent in curing characteristics, storage stability, luster retention properties, etc., by subjecting a polymer containing both a hydrolyzable silyl group and an acid group and a specific polysiloxane to condensation reaction, neutralizing the reaction product to give a resin and dispersing the resin into water. SOLUTION: (A) A polymer containing both a hydrolyzable silyl group and an acid group and (B) a polysiloxane containing a hydroxyl group bonded to a silicon atom and/or a hydrolyzable group bonded to a silicone atom are subjected to condensation reaction. The reaction product is partially or completely neutralized with a basic compound to give a resin, which is dispersed or dissolved in water to give an aqueous resin excellent in strain resistance by raindrops, acid rain resistance, solvent resistance, chemical resistance and water resistance.

Glass substrate excellent in chemical resistance

Abstract: PURPOSE:To obtain a glass substrate not substantially contg. alkali metal oxides, excellent in chemical resistance, especially resistance to buffered hydrofluoric acid and preventing the occurrence of bubbles, foreign matter and stria at the time of melting. CONSTITUTION:This glass substrate consists of, by weight 50-65% SiO2, 7-19% Al2O3, 3-15% B2O3, 2-18% CaO, 10.5-25% BaO, 0-10% SrO, 0-10% ZnO and 0.1-4% ZrO2, and alkali metal oxides, MgO and PbO are not substantially contained.

Manufacture of polyamide

Abstract: PURPOSE: To obtain a polyamide resin improved, for example, in color tone, tensile strength, tensile elogation, flextural strength, flextural modulus, and chemical resistance with the production of various polyamides made possible efficiently. CONSTITUTION: This method is one wherein a primary condensate is formed and then the degree of polymerization is increased. At the time of the polymerization of the primary condensate, the maximum destined pressure is less than 23kg/cm -G and the maximum destined temperature is higher than 260 deg.C but at most 330 deg.C.

Resin composition, composition for lens and cured material thereof

Abstract: PURPOSE: To obtain a resin composition which gives a cured material having low specific gravity and high refractive index and excellent in surface hardness, chemical resistance and transparency. CONSTITUTION: This resin composition contains a di(meth)acrylate represented by the formula [wherein R1 is H or methyl; R2 is H, methyl or ethyl; and the average of (a+b) is 2 to 5] and an unsaturated compound other than the di(meth)acrylate.

Polyester and Vinyl Ester Coatings

Abstract: olyester and vinyl ester resinbased linings are known for their solvent and chemical resistance. The different resins in these linings have broad resistance ranges, with acid resistance being a major strength. Some of the specific resins resist 1 or more chemicals or types of chemicals better than other resins, so systems often are finetuned by the choice of resin for a particular chemical environment. Esters are the reaction product of an organic acid and an alcohol. Polymers used in this class of materials are the unsaturated polyesters formed by reaction of unsaturated dibasic acids and dihydric alcohols. Styrene or a similar vinyl-type monomer is used to cross-link the resin and form the film. The polymerization is initiated by a catalyst, with the reaction by free radical addition, which is a chemical reaction mechanism unique to this class

Fluoroadhesive and adhesive film and laminate prepared therefrom

Abstract: A fluoroadhesive which maintains heat resistance, chemical resistance, weather resistance, and electrical insulating properties and can impart strong adhesiveness directly to substrates such as metal or glass. It is prepared from a hydroxylated fluoroethylenic polymer prepared by copolymerizing 0.05 to 30 % by mole of at least one monomer selected among hydroxylated fluoroethylenic monomers with 70 to 99.95 % by mole of at least one monomer selected among fluoroethylenic monomers copolymerizable with the above monomer.

Improving the chemical resistance of glass containers by thermochemical treatment with a reagent solution

Abstract: A way to increase the chemical resistance of glass containers by injecting a quantity (0.2–1.0 ml) of a special reagent solution into freshly shaped items is considered.

Modified polypropylene resin foam, multilayer foam, and molded article obtained therefrom

Abstract: PURPOSE: To improve the heat resistance, heat-insulating properties, chemical resistance, and impact resistance in refrigeration and transport by mixing a base resin with an ethylene/butene random copolymer. CONSTITUTION: Up to 98 wt.% base resin consisting of either a propylene homopolymer which gives, upon analysis by gel permeation chromatography (GPC), a camel-shaped mol.wt. distribution curve showing the presence of branched polymers in a high-mol. region and has a Z-average mol.wt. of 2.0×10 or higher and an MZ/MW (weight-average mol.wt.) ratio of 3.0 or higher, or an ethylene/propylene copolymer based on the propylene homopolymer and having an ethylene content of 1-10wt.%, is compounded with 2-40wt.% modifier consisting of an ethylene/butene random copolymer having a butene content of 5-30wt.% and a density of 0.86-0.92g/cm optionally together with a small amount of an elastomer, e.g. a polyethylene resin, and further with an inorganic filler in an amount of 10-50wt.% based on all resins. The compound is fed to an extrusion foaming machine and a foaming agent is added thereto. The resulting mixture is thermally melted and extruded with a die.

Weather and soiling-resistant silicone-containing coating composition

Abstract: A coating agent composition comprising: (A) an organic resin, and (B) a silicone compound represented by the average composition formula (1): (X) a (Y') b (R 1 ) c SiO (4-a-b-c)/2 (1) wherein X is a particular functional group containing organic group, Y' is a hydrolyzable group or an admixture of a hydrolyzable group and the silanol group, R 1 is a monovalent hydrocarbon group, a ranges from 0.05 to 0.90, b 0.12 to 1.88, and c 0.10 to 1.00, a + b + c being in the range of 2.02 to 2.67. The amount of the silicon atoms to which said functional group-containing organic group X is bonded is 5 to 90 mol % based on the entire silicon atoms, and the amount of the T unit of R 1 -SiO 3/2 is 10 to 95 mole % based on the entire siloxane units. This composition is useful to form a coating film excellent in weathering resistance, adhesion, stain resistance, scuffing resistance, water resistance and chemical resistance and therefore suitable for protection of articles exposed outdoors.

Highly chemical-resistant anticlouding optical element

Abstract: PURPOSE: To produce an optical element having chemical resistance and anticlouding property. CONSTITUTION: A polymer contg. >=98.0wt.% polymer component, wherein 40.0-70.0wt.% consists of a transparent polystyrene resin having 250,000-500,000 weight average mol.wt. and added with 1.0-10.0wt.% nonionic surfactant is used to form an optical element by injection molding. The surface of the optical element is made hydrophilic and provided with an anticlouding property due to the surfactant. The element is resistant to chemicals because the polymer has a high degree of polymerization.

Abs resin composition for calendering

Abstract: PURPOSE: To obtain an ABS resin composition having excellent moldability in calendering and giving a film having excellent chemical resistance and light resistance. CONSTITUTION: This ABS resin composition for calendering has a melt flow rate of 5-30g/10min under 10kg load at 220 deg.C and contains 100 pts.wt. of an ABS resin and 0.5-5 pts.wt. of a polycaprolactone having a weight-average molecular weight of >=60,000. The above resin composition may further contain 5-50wt.% of a methacrylic resin having a melt flow rate of 5-15g/10min under 3.8kg load at 230 deg.C.

Phenolic resin compositions with improved impact resistance

Abstract: The phenolic siloxane composition can be used to: 1) combine phenol with aldehydes and alkoxy or silanol-functional silicone intermediates, or 2) phenol novolak resins with formaldehyde donor and alkoxy or silaol-functional silicone intermediates, or 3) phenolic resol The resin is prepared by combining with alkoxy or silanol-functional silicone intermediates. Catalysts may optionally be added to assist in the formation of phenolic resins, condensation of phenolic resins and hydrolysis and / or condensation of silicone intermediates. The composition prepared consists of IPNs of siloxane polymers and phenolic polymers, and has the same or better fire resistance, heat resistance and chemical resistance than conventional phenolic resins, and has improved impact resistance, tensile strength, flexural modulus and density.

Preparation and Characterization of Phenol Resin Coatings Containing Silica

Abstract: This paper shows that silica sol derived from silicon alkoxide is an excellent additive for resin. Silica disperses into the matrix of resin by using emulsion type phenol resin, and it can mix in resin homogeneously by using resol type phenol resin. It is well known that silica sol derived from silicon alkoxide consists of ultra fine particles. In the present study, a clear colorless silica sol has been prepared by hydrolysis of tetraethyl orthosilicate (TEOS) using p-toluenesulfonic acid monohydrate as a catalyst. The silica sol was mixed well in resol type phenol resin, and the contents of silica in coatings was higher in the case of resol type phenol resin than that of emulsion type phenol resin. The coatings were evaluated on the degree of surface-cracks, on chemical resistance (acidic and basic aqueous solutions) based on peeling from substrate, on hardness and on resistance to fire. Emulsion type phenol resin and resol type phenol resin were used. Both of the coatings up to 30mass% silica-contents in the former and 45mass% silica-contents in the latter were crack-free. Chemical resistance was not degra-dated by the addition of silica. Hardness and resistance to fire were remarkably improved by the addition of silica sol.