Showing papers on "Chemical resistance published in 1998"

Syndiospecific polymerization of styrene

Abstract: Syndiotactic polystyrene, namely XAREC® is being developed by Idemitsu Petrochemical Co., Ltd. as a major new polymer family. XAREC® is a new crystalline engineering thermoplastic with a crystalline melting point of 270 °C. Because of its crystalline nature, XAREC® has a high heat resistance, an excellent chemical resistance and a water/steam resistance. XAREC® also has the dip soldering resistance. Potential applications for XAREC® include surface-mount electronic devices and electrical connectors. In this paper, some mechanistic models for polymerization and stereo-regulation as well as the factors which affect the activity and stereospecificity of the catalysts are discussed. The effects of substitutions on Cp ligand of half titanocene complexes were examined. The bulky substitution groups reduce the activity. Also, borate compounds as activator and effects of hydrogen are discussed.

Tetrafluoroethylene copolymer and use thereof

Abstract: A tetrafluoroethylene copolymer comprising 30 to 81 % by mole of tetrafluorethylene and 70 to 19 % by mole of at least one other monomer, wherein the polymer chain is terminated with a carbonate group and which has a melt flow rate (200 °C, load 5 kg) of 0.1 to 100 g/10 min and a melting point of 90 to 200 °C. The copolymer can be directly and firmly bonded to other materials, such as general-purpose resins, while maintaining the excellent chemical resistance, weather resistance, solvent resistance, nontackiness, electrical insulating properties, antifouling properties, and flame retardancy inherent in fluororesins, can be molded at a lower temperature than the conventional fluororesins, heat-fused to and coextrudable together with general-purpose resins not possessing heat resistance, and can be molded at low temperature.

Chemical Resistance and Tensile Properties of Short Bamboo Fiber Reinforced Epoxy Composites

Abstract: Short bamboo fiber reinforced epoxy composites have been developed with varying fiber length. The chemical resistance tests indicate that the composite materials are resistant to acetic acid, hydrochloric acid, nitric acid, sodium hydroxide, sodium carbonate, ammonia, benzene, carbon tetrachloride and toluene. The variation of tensile load at break with fiber length has been studied and the tensile load is found to be maximum for the fiber length of 30 mm.

Anti-reflection material and method for producing the same

Abstract: The present invention provides an anti-reflection material and a polarizing film which can exhibit excellent anti-reflection properties and can obtain a visible image without glittering and without reducing an image contrast while exhibiting an excellent wear resistance and chemical resistance, as well as, exhibiting an excellent stain resistance. A surface-roughened layer (12) is provided on one surface or double surfaces of a transparent substrate (11) directly or via another layer, and the surface-roughened layer (12) comprises an ultraviolet-curing resin comprising at least an epoxy compound and a photo-cationic polymerization initiator.

High performance filters comprising an inorganic composite substrate and inorganic fiber whiskers

Abstract: A filter media system, which is capable of operating in the microfiltration regime, offers: low cost, durability, high temperature and chemical resistance, no particulation, mechanical strength, separation efficiency, and biocompatibility. A filter media system is comprised of a carbon or ceramic composite substrate which contains a carbon or ceramic matrix reinforced with carbon or ceramic fibers. The composite has an array of carbon or ceramic fiber whiskers grown onto its surface or in its bulk. A process is provided for manufacturing the filter media system wherein a carbon fiber is disposed in a matrix deposited by a CVI or LPI process, at temperatures of about 900 to about 1200° C. to achieve a weight gain of about 10 to 200% (the ceramic matrix is deposited by a CVI process from an aqueous slurry or by use of a preceramic polymer). This composite is treated with an aqueous solution of metal catalyst salt and is then heated in hydrogen at elevated temperatures to reduce the metal salt to metal. Whiskers are then grown on the surface or in the bulk of the catalyst deposited composite such as by decomposition of methane gas using metal catalyzed chemical vapor deposition (CVD).

Aqueous resin dispersion composition

Abstract: A composition comprising an aqueous dispersion of a synthetic resin (A) having an intrinsic viscosity, [θ], as measured at 35 °C in methyl ethyl ketone of 0.3 to 2.0; or an aqueous resin dispersion mixture comprising the above dispersion and an aqueous dispersion of a synthetic resin (B) whose intrinsic viscosity, [θ], as measured at 35 °C in methyl ethyl ketone is 0.6 or above and is higher by at least 0.3 than the [θ] of the synthetic resin (A). They have improved film-forming properties and give a coating film excellent in chemical resistance, water resistance, mechanical properties, and resistance to boiling water.

Molecular sieve carbon film and its manufacture

Abstract: PROBLEM TO BE SOLVED: To prepare a molecular sieve carbon film having good selective permeability, high strength, and heat resistance by making a carbon film having a carbon content of at least a given value and lots of pores adhere to the surface of a porous ceramic material of a specified shape. SOLUTION: A porous ceramic material such as alumina, silica is used, and the porosity of the material is made 30-80%. A thermosetting resin such as a phenol and a melamine resin is applied on the surface of the material to form a polymer film, and the film is heat-treated at 550-1100 deg.C in a nonoxidative atmosphere. A molecular sieve carbon film having a carbon content of not less than 80% and lots of pores at least 1nm in diameter is prepared. The film can separate and purify a component of a specified molecular size selectively from various mixed gases of different molecular sizes and is good in heat resistance, chemical resistance and has high strength.

Corrosion resistant resin coating structure in a metal tube

Abstract: The present invention provides a corrosion resistant resin coating excellent in corrosion resistance, weather resistance and chemical resistance, mechanically tough and strong and having high heat resistance temperature. A steel tube optionally having a copper layer is formed. Then, a zinc or zinc/nickel plating layer is formed on the outer circumferential surface of the steel tube, and a chromate film comprising a trivalent chromium compound is formed on the zinc or zinc/nickel plating layer. At least one layer of a kind of resin selected from the group consisting of polyvinyl fluoride, polyvinylidene fluoride, polypropylene, polyethylene and polyamide resins is formed, as required, through a primer. Sufficiently satisfactory results are obtained in corrosion resistance test.

Conductive membrane and coating liquid for forming conductive membrane

Abstract: PROBLEM TO BE SOLVED: To provide a transparent conductive membrane whose initial surface resistance is low at 102-103 Ω/unit area level, which is excellent in heat resistant, moisture resistance, weather resistance and chemical resistance, and which maintains a low resistance for a long term, and has a good visible light permeability. SOLUTION: Aqueous solution (A) containing one kind of or more of metallic salt selected from a group of Au, Pt, Ir, Pd, Ag, Rh, Ru, Os, Re, and Cu is mixed with aqueous solution (B) containing a citric acid ion and a primary iron ion in nitrogen gas flow at, 25-95 deg.C; to deposit a coating liquid for forming a conductive membrane that contains an alloyed Ag-Pd fine particles. Then, a substrate is coated with the coating liquid to form a fine particle film thereon. Thereafter, a silica-based coating is formed thereon.

Composite materials for cookware

Abstract: Composite materials for cooking apparatuses which are produced by applying, to a substrate, a material comprising a fluorine-containing polymer having an excellent adhesive property to the substrate without necessitating complicated steps and are excellent in heat resistance, non-sticking property, stain-proofing property, water- and oil-repelling property, stain-removing property, chemical resistance, rust-preventing property, antibacterial property, resistance to energy ray and abrasion resistance. The composite materials for cooking apparatuses are produced by applying, to the substrate, the material comprising a fluorine-containing ethylenic polymer having functional group which is prepared by copolymerizing (a) 0.05 to 30% by mole of at least one of fluorine-containing ethylenic monomers having at least one functional group selected from the group consisting of hydroxyl, carboxyl, a carboxylic salt group, a carboxylic ester group and epoxy, and (b) 70 to 99.95% by mole of at least one of fluorine-containing ethylenic monomers having no functional group mentioned above.

Conformable composite chemical barrier closure and attachment tape

Abstract: A conformable, hand-tearable, high chemical barrier closure and attachment tape made up of a film composite which contains at least one stratum layer of polyvinylidene chloride, ethylene vinyl acetate, ethylene vinyl alcohol ethylene matallized polyester or similar chemical resistance material which may be disposed between additional layers of polyethylene, the film composite coated with an appropriate pressure sensitive adhesive which is further adhered to a woven base cloth which is further coated with additional pressure sensitive adhesive. Tapes having the structure show improved chemical resistance to the 15 liquid chemicals included on the ASTM F1001 chemical test battery as compared to a competitive tapes commonly used in the protective clothing and chemical packaging industry.

Compound, a process for the preparation thereof, and a resin composition

Abstract: Novel polyester compounds having a benzotriazole group of the invention are obtained by a ring-opening addition-polymerisation of lactones with the alcoholic hydroxyl group of 3-(5-chloro-2H-benzotriazol-2-yl)-5-(1,1-dimethyl-ethyl)-4-hydroxy-benzene-propanol, 3-(2H-benzotriazol-2-yl)-4-hydroxy-benzene-ethanol, 3-(5-methyl-2H-benzotriazol-2-yl)-5-(1-methyl-ethyl)-4-hydroxy-benzene-propanolbis[3-(2H-benzotriazol-2-yl)-4-hydroxy-benzene-ethanol]methane or the like. These compounds are used as ultraviolet-rays absorbents for thermoplastic resins. The resulting resin composition has an excellent light resistance and chemical resistance.

Composite chemical barrier fabric with enhanced durability

Abstract: A flexible, heat sealable, composite chemical barrier fabric (20) which exhibits enhanced durability characteristics comprised of a multi-layered chemical barrier material or fabric (22) that has been coated on one or more sides with a layer of halogen-free thermoplastic olefin resin (24, 26). Fabrics having this structure show enhanced durability characteristics while maintaining a high degree of chemical resistance and heat sealability. More specifically, embodiments are included that show order of magnitude increases in various measures of durability including flex crack resistance, abrasions resistance, and resistance to puncture as compared to un-coated fabrics.

Electronic component-protecting material

Abstract: Electronic component-protecting material excellent in mechanical properties, electric properties, heat resistance and chemical resistance and reduced in water absorption, made from a curable resin composition comprising (A) a cyclic olefinic polymer having a number-average molecular weight of 1,000 to 500,000 and (B) at least one curing agent selected from the group consisting of organic peroxides, curing agents which exhibit their effects upon heating and curing agents which exhibit their effects upon irradiation with a light.

Transfer material with excellent wear resistance and chemical resistance, surface protective sheet, and manufacture of molding with excellent wear resistance and chemical resistance using them

Abstract: PROBLEM TO BE SOLVED: To provide a transfer material with excellent wear resistance and chemical resistance and a surface protective sheet for eliminating a residue of fluidity and adhesive properties in a protective print layer before emitting an activated energy beam even in the step of printing in line without generating a crack in the print layer disposed on a molding curved surface at the time of adhering the transfer material or the protective sheet to the molding and a method for manufacturing the molding with excellent wear resistance and chemical resistance using them. SOLUTION: The transfer material 6 comprises a base sheet 1 having a releasability, a protective print layer 2 made of an activated energy beam curable resin composition containing as an effective component a reaction product having an urethane bonding amount of 6000 to 50000 g/eq and obtained by a polyaddition reaction of a polymer having a (meth)acryl equivalent of 100 to 300 g/eq, a hydroxyl value of 20 to 500 and a weight-average molecular weight of 5000 to 50000 and a multifunctional isocyanate and provided on a release surface of the sheet 1, and other print layers 3, 4 provided on the layer 2.

Varnished compositions, methods of making and components made therefrom

Abstract: Apparatuses and methods are disclosed for the production of a polyester/epoxy copolymer that can be applied as a liquid to a surface prior to being cured. The method of preparing the polyester/epoxy copolymer includes mixing maleic acid with dicyclopentadiene to produce a ten-carbon double ring ester, promoting esterification with the addition of a source of hydroxyl, such as an alcohol or a glycol, to a desired acid number and reacting with an epoxy. Optionally, a source of unsaturation may also be added. Examples include excess maleic anhydride, fumaric acid, excess ten-carbon ester, nadic anhydride, or tetrahydrophthalic acid. Electrical components of the present invention include a cured coating of the copolymer of the present invention over at least a portion of the component. Specific, selective modifications to 100 % reactive polyester/epoxy copolymer electrical varnishes can result in greatly improved moisture and chemical resistance properties.

Fine fibrous cellulose-containing mechanical material

Abstract: PROBLEM TO BE SOLVED: To provide a material having high elasticity and strength with excellent tensile strength and strain resistance, having an excellent hydrophilicity and no toxicity and providing an electric conductivity, magnetic properties, high insulating properties, a thermal conductivity, weatherability, chemical resistance or the like. SOLUTION: A fine fibrous cellulose is contained and the content thereof is 0.01-100%. It is preferable that the material contains one or more kinds of substances selected from the group consisting of a hydrophilic polymer material, a hydrophobic polymer material, an inorganic material, a coupling agent, an adhesive, a coating material, a dye, a pharmaceutical and an antibiotic.

Condensed azo compounds and process for preparing the same

Abstract: The present invention provides novel condensed azo compounds using bisamide compounds of 2-hydroxynaphthalene-3,6-dicarboxylic acid, amide, or ester as the couplers, which have excellent properties such as excellent water resistance, chemical resistance, solvent resistance, and heat resistance.

Biosoluble pot and marble (flame attenuated)-derived fiberglass

Abstract: Glass compositions suitable for pot and marble fiberization display excellent chemical resistance to both acids and moisture while being highly biosoluble at the same time. The glass compositions are characterized by ratios of components which are reflective of acid resistance, biosolubility, and moisture resistance. Preferred glasses have a difference between HTV (103 poise) and liquidus greater than 500 °F, and a biodissolution greater than about 350 ng/cm2/hr.

Structure having transparent layer composed of fluorinecontaining polymer and reflecting sheet using it

Abstract: PROBLEM TO BE SOLVED: To obtain a heat ray-reflecting structure having heat resistance, non- adhering characteristics, stainproof characteristics, chemical resistance, weathering resistance or the like without harming reflecting efficiency. SOLUTION: A structure is formed by directly adhering a base and a layer composed of a fluorine-containing polymer without using a binder therebetween. An infrared ray permissivity of the layer composed of fluorine-containing polymer is 85% or higher and a contact angle with water of a surface thereof is 95 degrees or more. A decomposition heat resistance temperature of 1% weight loss of the fluorine-containing polymer is 300°C, or higher and a crystalline melting point thereof is 250°C or higher. COPYRIGHT: (C)2000,JPO

Transfer material, surface protective sheet, and manufacture of molded product having superior light fastness, wear resistance and chemical resistance using the material and the sheet

Abstract: PROBLEM TO BE SOLVED: To crosslink and cure completely by irradiation of activation energy beam by forming a protective layer containing hydroxyphenyl benzotriazole represented by a formula I or hydroxyphenyl-S-triazine represented by a formula II as an ultraviolet absorber. SOLUTION: For forming a protective layer 2 on one face of a base sheet 1 of release properties, hydroxyphenyl benzotriazole represented by a formula I or hydroxyphenyl-S-triazine represented by a formula II is used as an ultraviolet absorber for an activation energy beam cured resin composition containing a polymer composed of (meth)acryl of weight per equivalent of 100-300 g/eq, hydroxyl valence of 20-500 and weight average molecular weight of 5000-50000 and polyfunctional isocyanate as effective components. When the activation energy beam cured resin composition is heated, hydroxyl reacts with isocyanate and also when being exposed in the activation energy beam, an ethylene unsaturated group is polymerized and resin is crosslinked. That is, resin is crosslinked by both of heat and activation energy beam.

Acrylic resin for coating material and its production

Abstract: PROBLEM TO BE SOLVED: To produce the subject one-pack type resin, enabling the low- temperature baking, excellent in adhesion, chemical resistance, etc., and useful as even an anion electrodeposition coating material, etc., by polymerizing a specific composition according to a specified method. SOLUTION: This acrylic resin is a copolymer of (A) an acrylic or a methacrylic ester monomer, (B) an α,β-unsaturated carboxylic acid, (C) a hydroxyl group-containing unsaturated monomer, (D) a monomer derived from (meth) acrylamide and (E) other unsaturated monomers and has 5,000-100,000 weight- average molecular weight, 10-80mg KOH/g-R acid value, 30-120mg KOH/g-R hydroxy value and -30 to +100 deg.C glass transition temperature. The component D is preferably methoxymethylacrylamide, etc., and the component E is preferably styrene. When copolymerization is carried out, (1/20) to (16/20) of the monomer mixture is preferably prepolymerized and the residual monomer mixture is dropped to the resultant prepolymerized mixture to perform the polymerization.

Composite film for interior finishing material, composite sheet for interior finishing material using the same, and laminate

Abstract: PROBLEM TO BE SOLVED: To provide chemical resistance, stain resistance and satisfactory adhesive properties by laminating a heat resistant polyalkylene terephthalate polyester resin layer having a specific temperature or higher and a polybutylene terephthalate polyester resin layer containing a specific amount of polycarbonate and having a specific range of a melting point. SOLUTION: The composite film for an interior finishing material is obtained by laminating a heat resistant polyalkylene terephthalate polyester resin layer having a melting point of 220 deg.C or higher, and a polybutylene terephthalate polyester layer having a melting point of 150 to 215 deg.C. The polybutylene terephthalate resin layer contains polycarbonate resin of 5 to 50 wt.% for the purpose of improving durability such as water resistance and chemical resistance. If its adding amount is less than 5 wt.%, adding effect cannot be obtained. If it exceeds 50 wt.%, thermal adhesive properties are lowered. A thickness of the polybutylene terephthalate resin layer is 5 μm or more and 20 to 80% of the thickness of the entire film.

Adhesive composite material for office automation machines

Abstract: An adhesive composite material for office automation machines which is excellent in heat resistance, adhesiveness, stainproofness, water- and oil-repellency, stain removing properties, chemical resistance, rustproofness, antimicrobial properties, actinic radiation resistance and wear resistance can be produced without any complicated step by applying to a substrate a material comprising a fluorinated copolymer excellent in adhesion to the substrate. Specifically, an adhesive composite material for office automation machines, produced by applying to a substrate a material comprising a fluorinated ethylenic copolymer prepared by copolymerizing (a) 0,05 to 30 mole % of at least one fluorinated ethylenic monomer having at least one functional group selected among hydroxyl, carboxyl, carboxylic salt, carboxylic ester and epoxy groups, with (b) 70 to 99.95 mole % of at least one fluorinated ethylenic monomer free from the above functional groups.

A fluorinated hard mask for micropatterning of polymers

Abstract: The present invention discloses the formation of a hard mask layer in an organic polymer layer by modifying at least locally the chemical composition of a part of said exposed organic low-k polymer. This modification starts from an exposed surface of the polymer and extends into the polymer thereby increasing the chemical resistance of the modified part of the polymer. As a result, this modified part can be used as a hard mask or an etch stop layer for plasma etching.

Adhesives and coatings based on poly(vinyl acetal)s

Abstract: Phenolic resins such as resole phenol- and cresol-formaldehyde, as well as low-molecular-weight epoxy resin based on bis(4-hydroxy phenol) cyclohexane were prepared and modified with various types of the prepared poly(vinyl acetal)s. Poly(vinyl formal), poly(vinyl isobutyral), and poly(vinyl propional) were used. This study indicated that the optimum conditions for curing phenolic or epoxy resin-poly(vinyl acetal)s adhesive compositions are of an equal weight ratio or a 2: 1 weight ratio in the presence of phthalic anhydride (10 or 20 wt %) of resin content as a curing agent at 150°C for 20 or 60 min, respectively. The effect of acetal type on the tensile shear strength values of resin samples, cured under the previously mentioned optimum conditions for different times, was investigated. The effect of structure of cresol-formaldehyde and epoxy resins was also studied. Metallic and glass coatings from the previous pure resins and their formulated mixtures were also prepared and evaluated as varnishes or paints.

Thermoplastic resin composition and formed article thereof

Abstract: PROBLEM TO BE SOLVED: To obtain an excellent thermoplastic resin composition having a number of properties of weather resistance, shock resistance, pigment coloring property, chemical resistance and transparency. SOLUTION: This composition is a thermoplastic resin composition comprising 15 pts.wt. or more and less than 50 pts.wt. of a graft copolymer (I) obtained by graft-polymerizing a monomer mixture (B) consisting of an aromatic alkenyl compound and a vinyl cyanide compound in the presence of a composite rubber (A) having a weight average particle size of 0.08-0.16 μm consisting of a polyorganosiloxane (a-1) and a polyalkyl acrylate (a-2) and exceeding 50 pts.wt. and 85 pts.wt. or less of a polymethyl methacrylate resin (II) [(I)+(II)=100]. The content of the composite rubber (A) in the thermoplastic resin composition is 10-25 pts.wt.

Polyamideimide resin paste and film-forming material

Abstract: PROBLEM TO BE SOLVED: To provide a polyamideimide resin paste excellent in softness, adhesion to sealants, solvent resistance and chemical resistance while retaining low warpage and, in addition, soluble in non-nitrogen-containing polar solvents, having low temperature curability and excellent in heat resistance, electrical characteristics, resistance to moisture, workability, shape retention and economy, and a film-forming material containing the same. SOLUTION: A polyamideimide resin paste comprises (A) 100 pts.wt. polyamideimide resin obtained by reacting (a) a tri- or higher-valent polycarboxylic acid having an acid anhydride group or a derivative thereof, (b) a dicarboxylic acid having a number average molecular weight of 1,000-10,000 represented by the formula (a plurality of R are each independently a 1-12C alkylene group; a plurality of X are each independently a 1-12C alkylene group or an arylene group; and n and m are each independently an integer of 1-20) and (c) a polyisocyanate compound, (B) 1-50 pts.wt. epoxy resin, and (C) inorganic fine particles and/or organic fine particles, and a film-forming material comprises this polyamideimide resin paste. COPYRIGHT: (C)2000,JPO