Showing papers on "Chemical resistance published in 2003"

Polysilazane-containing coating solution

Abstract: A coating solution comprising 0.1 to 35% by weight of an inorganic or organic polysilazane having repeating units represented by the general formula below and soluble in a solvent and 0.1 to 10% by weight of catalyst such as 4,4'-trimethylenebis(1-methylpiperidine) based on a pure polysilazane content. By applying the coating solution onto the surface of base materials such as metals, plastics, glass, ceramic, wood, cement, mortar, bricks, etc., a silica coating strongly adhered to the base materials can be formed excellent in corrosion resistance and anti-scratch properties and simultaneously excellent in characteristics such as abrasion resistant, long-lasting anti-fouling properties, wetting properties to water, sealing properties, chemical resistance, oxidation resistance, physical barrier effect, heat resistance, fire resistance and antistatic properties.

Chemical Resistance and Tensile Properties of Epoxy/Unsaturated Polyester Blend Coated Bamboo Fibers

Abstract: The untreated and 2%aqueous NaOH treated bamboo fibers (Dendrocalamus strictus) were coated with epoxy, unsaturated polyester (UP) and their blends. The chemical resistance of these fibers to acetic acid, nitric acid, hydrochloric acid, sodium hydroxide, ammonium hydroxide, sodium carbonate, benzene, toluene, carbon tetrachloride and water was studied. The blend coated fibers showed better resistance to the chemicals mentioned above. The blend coated fibers had higher tensile strength. This was attributed to the hydrogen bonding between the unsaturated polyester and epoxides group.

Fluoropolymer and composition thereof

Abstract: The present invention provides a fluoropolymer capable of giving fluorine-containing molded materials and laminates excellent in moldability, productivity, interlaminar bonding and stress cracking resistance, in particular stress cracking resistance upon contacting with various liquid chemicals, without impairing such characteristics intrinsic in fluororesins as chemical resistance, solvent resistance, weathering resistance, antifouling properties, liquid chemical impermeability and nonstickiness. The present invention provides a fluoropolymer which is an oligomer-containing or oligomer-free fluoropolymer, wherein said oligomer has a molecular weight not higher than 10,000 and amounts to not more than 0.05% by mass relative to the fluoropolymer.

Water fluorine-carbon nanapaint and producing process thereof

Abstract: A water F-C nano paint is prepared from aqueous vinyl F-C emulsion as filming liquid, nano material as modifier, pigment, filler, assistant and water. Its advantages are smooth surface, high weatherability, self-cleaning power, chemical resistance and durability, and low cost.

Water-borne non-toxic high-performance inorganic silicate coatings

Abstract: Silicate coatings are reactive inorganic coatings These provide weather-, chemical- and temperature-resistance coatings with lasting decoration and protection of steel against corrosion Properties of these coatings depend on the ratio of silica to alkali metal oxide The drying rate and chemical resistance properties of the film increase with increasing ratio of silica to alkali metal oxide However, water miscibility of the system decreases Their curing mechanism shows an explicit difference between the curing on masonry and iron substrates These coatings exhibit a unique property, namely their chemical reaction with the substrate, which accounts for their excellent abrasion resistance, thus making them a permanent part of the system

Enhancement of the chemical resistance of nitrile rubber by direct fluorination

Abstract: Nitrile rubber (NBR), poly(acrylonitrile-co-butadiene) or NBR packers, are used to seal oil-well tubing, where they often come into contact with ZnBr 2 brines at high temperatures and pressures. Under these conditions, NBR exhibits accelerated chemical degradation, which results in embrittlement and cracking. Although alternative fluoropolymers exhibit excellent chemical resistance, their strength is less than NBR, and replacement of the usual gasket materials with fluoroelastomers is expensive. We have demonstrated that a fluoropolymer surface on a nitrile elastomer provides the necessary chemical resistance while the elastomer retains strength. This can be achieved by direct fluorination, a rather easy and inexpensive process. Samples of NBR O-rings were fluorinated by exposure to F 2 and F 2 /HF mixtures at various temperatures. Although fluorination by F 2 produced the desired fluoropolymer layer, fluorination by F 2 /HF (hydrofluoric acid) mixtures gave a smoother fluorinated layer at lower temperatures and shorter reaction times. Elemental analysis showed that the fluorinated layer eliminated ZnBr 2 diffusion into the NBR polymeric matrix. Surface fluorination also significantly retarded the loss of the mechanical properties of NBR when it was exposed to zinc bromide fluid.

Flame-retarded epoxy resin composition, prepregs containing the same, laminated sheets and printed wiring boards

Abstract: A flame-retarded epoxy resin composition which comprises an epoxy resin and a curing agent as the essential components and further contains a phosphorus-containing flame-retardant polyester resin obtained by the condensation or polycondensation of the reactive phosphorus compound represented by structural formula (Ι). Since the epoxy resin composition is enhanced in flame retardance by using the phosphorus-containing flame-retardant polyester resin serving as a halogen-free flame retardant, the composition little evolves toxic gas in burning and exhibits excellent moldability. Further, the products obtained by curing the composition are excellent in heat resistance, water resistance, chemical resistance, flame retardance, soldering resistance, moisture resistance, and tracking resistance and so on.

Heat-schrinkable film

Abstract: A heat-shrinkable film and a heat-shrinkable multi-layer film which are prepared from a resin composition which comprises an aromatic vinyl compound-conjugated diene block copolymer having a microphase separated structure comprising a soft phase and a hard phase and further having a specific structure and preferably exhibiting a specific dynamic viscoelasticity spectrum and a styrene polymer having a syndiotactic structure, in a specific ratio. The heat-shrinkable film or a heat-shrinkable multi-layer film offers an excellent balance of heat resistance, high shrinkability especially at a low temperature, the resistance to natural shrinking, chemical resistance and rigidity.

Radiation solidified paint

Abstract: A paint solidified by ultraviolet light radiation or electronic beam triggering features that its (methyl) acrylic acid esterified polyurethane oligomer is prepared by reaction between polyurethane polyol and diiocyanate or polyisocyanate Its advantages are low cost, high mechanical toughness, chemical resistance, hydrolytic stability and thermal stability

Transparent polyamide molding material having improved transparency, chemical-resistance and high permanent fatigue strength

Abstract: PROBLEM TO BE SOLVED: To provide a transparent polyamide molding material having a very good heat resistance and chemical resistance, and a very high permanent fatigue strength. SOLUTION: This transparent polyamide molding material has a melting enthalpy between 0-12 J/g, and is constituted by a diamine mixture of 10-70 mol% PACM [bis-(4-aminocyclohexyl)methane] having COPYRIGHT: (C)2004,JPO

Thermal recording material

Abstract: The present invention provides a thermal recording material, which is easy to manufacture and has excellent productivity, water resistance, heat resistance (running stability) and chemical resistance, by solving various problems caused by using a crosslinking agent for a protective layer. The thermal recording material of the present invention comprises a protective layer mainly composed of a resin emulsion (a) comprising a copolymer resin emulsion (b) containing (meth)acrylonitrile and a vinyl monomer copolymerizable therewith, and having an SP value (solubility parameter) of 12.0 or more, a glass transition temperature (Tg) of 10 to 70° C., and a minimum film-forming temperature (MFT) of 5° C. or less, and a polyolefin copolymer resin emulsion (c).

Processability and chemical resistance of the polymer blend of thermoplastic polyurethane and polydimethylsiloxane

Abstract: This work is aimed to develop the melt blend of thermoplastic polyurethane (TPU) and polydimethylsiloxane (PDMS) and to study the effect of the chemical resistance on the tensile properties and morphology of the blends. The master batch blends at 2% of PDMS with 98% of TPU were firstly prepared by an internal mixer and then the blends of TPU/PDMS were prepared by melt mixing using a twin screw extruder. The maximum PDMS content that can be mixed with TPU was found to be no higher than 1%. Higher PDMS content leaves an unmelted TPU fraction in the blends due to the short residence time in the twin screw extruder. The resultant blends show an increase in the elongation at break up to 30% and in Young's modulus up to 40% at the optimum PDMS concentration of around 0.6%-0.8%, beyond which these properties diminish. The ultimate tensile strength and the energy to break are decreased by about 20% and 10%, respectively. The Scanning Electron Micrographs of the blends show dispersed phases of PDMS in a TPU matrix. The domain size of the PDMS phase becomes smaller when increasing PDMS content from 0.2% to 0.8%. The morphology of the fractured surface of TPU/PDMS blends shows less fibrous characteristics with increasing PDMS content in the blends. For the study of the effects of chemical resistance on the tensile properties and morphology of TPU/PDMS blends, two chemical reagents, sulfuric acid (H 2 SO 4 , 3% v/v) and sodium hydroxide (NaOH, 10% w/v) are selected. The results on the relationship of chemical resistance to tensile properties and morphology of the blends show that NaOH solution has a stronger effect on the tensile properties and morphology of virgin TPU and the blends than H 2 SO 4 solution. The ultimate tensile strength and the energy to break of virgin TPU after base immersion was found to be strongly decreased, which could be caused by the base hydrolysis of the polyester soft segment of polyurethane. The effect of PDMS content in the blends on the base resistance and tensile properties is similar to results before immersion, i.e. the effective PDMS content in the blends that can generally improve tensile properties of the blends after immersion in NaOH does not exceed 0.8%. The results are in agreement with the weight loss of TPU/PDMS blends after base immersion and the morphology of the fractured surface of TPU/PDMS blends after base immersion that exhibit very small amounts of a fibrous character. There are also some small particles detached at the surface. This could be the result of an occurrence of a corrosive reaction between the sample surface and NaOH solution.

Composition containing carboxylic photosensitive resin

Abstract: PROBLEM TO BE SOLVED: To provide a curable composition giving an excellent cured film which satisfies such properties as electric insulation, PCT (pressure cooker test) resistance, adhesion, solder heat resistance, chemical resistance and resistance to electroless gold plating in addition to cracking resistance. SOLUTION: The curable composition comprises (A) a carboxylic photosensitive resin obtained by reacting a compound (a) having two or more phenolic hydroxyl groups in one molecule with an alkylene oxide (b) or cyclic carbonates (c), reacting the resulting reaction product (d) with an unsaturated-group-containing monocarboxylic acid (e) and a saturated aliphatic monocarboxylic acid (f) and/or an aromatic monocarboxylic acid (g), and reacting the resulting reaction product (h) with a polybasic acid anhydride (i), (B) a photopolymerization initiator, (C) a photosensitive (meth)acrylate compound and (D) a diluting solvent. COPYRIGHT: (C)2005,JPO&NCIPI

Chemical and Micro-Structural Changes in Glass-Like Carbon during High Temperature Heat Treatment

Abstract: A glass-like carbon was fabricated using furan resin. The influence of heat treatment temperature during fabrication process on the chemical and micro-structural changes was studied by various analytical and spectroscopic methods including TGA, FT-IR, CHN, TEM and XRD. The chemical resistance properties of the fabricated glasslike carbon were also investigated. It has been found that the heat-treated samples at higher temperature up to 2600 °C in N2 atmosphere had little weight loss, small amounts of functional groups, and high carbon content. The fabricated glass-like carbons upon heat treatment at 2600 °C showed an amorphous stage without any grain growth and/or reconstruction of structure. The glass-like carbon had much better chemical resistance than the artificial graphite, and exhibited a high chemical resistance due to its low surface areas, minimum impurities, and low graphite crystallites.

Polyacetal resin composition having excellent wear resistance and abruption-preventing effect

Abstract: Disclosed is a polyacetal resin composition, including a polyoxymethylene homopolymer or copolymer, an antioxidant, a thermal stabilizer, a polyethylene vinylacetate copolymer and hydroxyl pentaerythritol fatty acid ester. The polyacetal resin composition is excellent in mechanical properties, chemical resistance, heat resistance, dimensional stability, and electrical properties. Further, the composition is advantageous in terms of superior wear resistance and abruption-preventing effect.

Composite material comprising polyimide porous membrane and proton-conducting membrane

Abstract: PROBLEM TO BE SOLVED: To provide a novel material exerting a new function prepared by using a polyimide film showing an excellent heat resistance, chemical resistance and mechanical strength as a substrate, and a proton-conducting membrane showing a heat resistance and a proton conductivity prepared by using the polyimide film as a substrate. SOLUTION: The composite material comprising the polyimide porous membrane is obtained by filling a highly heat-resistant organic material and/or inorganic material in pores of the polyimide porous membrane and retaining its shape through a physical and/or chemical interaction. The proton-conducting membrane is prepared by filling a monomer or macromonomer which serves as a precursor of a highly heat-resistant, proton-conducting polymer in the pores of the polyimide porous membrane and inducing chemical reaction such as polymerization and crosslinking to generate the polymer. COPYRIGHT: (C)2004,JPO

Surface-modified inorganic porous material and fuel cell comprising the same as electrolyte

Abstract: An inorganic porous material having at least one functional group exhibiting proton conductivity selected from the group consisting of sulfonate groups and phosphate groups introduced in the surface thereof; a method of modifying an inorganic porous material; and a fuel cell comprising the inorganic porous material as a solid electrolyte. There is provided a solid electrolyte film that exhibits high proton conductivity, is excellent in heat resistance and chemical resistance and is highly useful as an electrolyte of fuel cell or the like.

Optical fiber and method of manufacturing the same

Abstract: PROBLEM TO BE SOLVED: To provide an optical fiber having high heat resistance, moisture resistance and chemical resistance and a low transmission loss. SOLUTION: In the method of manufacturing a plastic optical fiber, a fused material of a crystalline perfluoro resin is molded and stretched to obtain a core material, and then a clad layer made of a perfluoro fluorocarbon resin having a refractive index lower than that of the core material is formed on the core material during molding or before or after stretching. COPYRIGHT: (C)2004,JPO

Thermosetting coating material composition, method for coating finishing and coated article

Abstract: PROBLEM TO BE SOLVED: To obtain a coating material composition for a precoated steel sheet that is excellent in chemical resistance, hardness of a coating film, stain resistance against raindrop contaminant, processability, appearance of coated film, storage stability and coating workability, and to provide a method for coating finishing using the composition and a coated article using the same SOLUTION: The coating material composition is a thermosetting resin composition which comprises as essential components (A) a resin having a hydroxy group of a 5-200 mg/g hydroxyl value and whose number average molecular weight is 500-20,000, (B) an amino-resin curing agent reactive with the resin (A), (C) a condensate or a partially hydrolyzed product of the condensate of an organo silicate represented by the formula; (R 1 ) m -Si-(OR 2 ) n , wherein R 1 is phenyl group or an 1-18C alkyl group, R 2 is a 1-6C alkyl group, (m) is an integer of 0-1, (n) is an integer of 3-4 and m+n is 4, and (D) a sulfonic acid blocked with an epoxy group COPYRIGHT: (C)2005,JPO&NCIPI

Reinforced thermoplastic resin composition

Abstract: PROBLEM TO BE SOLVED: To obtain a reinforced thermoplastic resin composition excellent in mechanical properties, moldability, heat resistance, durability, excellent in appearance, impact resistance, rigidity when heated, low water absorption, chemical resistance, hydrolysis resistance and the like and capable of being suitably used as the molding material for automotive parts materials, electric and electronic materials, industrial materials, engineering materials, household items and the like. SOLUTION: This reinforced thermoplastic resin composition comprises 100 pts.wt. thermoplastic resin composition consisting of 99-1 pts.wt. (A) polytrimethylene terephthalate and 1-99 pts.wt. (B) polycarbonate and 1-250 pts.wt. (C) inorganic filler to be blended.

Flame Retardant Thermoplastic Resin Composition Showing Good Chemical Resistance

Abstract: PURPOSE: Provided is a thermoplastic resin composition, which has a remarkably improved resistance against the chemicals used in coating and plating and has excellent flame resistance even at a thin thickness of about 1.2 mm. CONSTITUTION: The flame retardant thermoplastic resin composition comprises: (A) 45-95 parts by weight of a polycarbonate resin; (B) 1-50 parts by weight of an acrylic rubber-modified graft copolymer; (C) 1-50 parts by weight of a vinyl-based copolymer or a mixture of vinyl-based copolymers; (D) 1-30 parts by weight of a mixture of organic phosphorous compounds, based on 100 parts by weight of the total amount of base resins (A)+(B)+(C), in which the mixture contains (d1) 1-50 wt% of a cyclic phosphazene oligomer compound and (d2) 99-50 wt% of a phosphate ester compound; and (E) 0.05-5 parts by weight of a fluorinated polyolefin resin having an average particle diameter of 0.05-1000 micrometers and a density of 1.2-2.3 g/cm¬3, based on 100 parts by weight of the total amount of base resins (A)+(B)+(C).

Water dispersion of polylactic acid-polyethylene glycol block copolymer, particles of the copolymer, and coated film formed from them

Abstract: PROBLEM TO BE SOLVED: To prepare a water dispersion which can be easily dispersed in water, is excellent in water resistance of its coating film, strength at a breaking point, solvent resistance, chemical resistance, and adhesion properties to a polylactic acid substrate, can easily coat and impregnate, and is good in stability and biodegradability, and to provide a finely divided particle of a polylactic acid obtained by drying and to prepare a coating film having excellent smoothness. SOLUTION: The water dispersion of a polylactic acid-polyethylene glycol block copolymer is an A-B-A terblock copolymer comprising polylactic acid (A) and polyethylene glycol (B). COPYRIGHT: (C)2005,JPO&NCIPI

Cross-linked fluororesin composite material and its production method

Abstract: PROBLEM TO BE SOLVED: To provide a fluororesin having high toughness, abrasion resistance, radiation resistance, etc., without detriment to the properties inherent in a fluororesin, such as heat resistance, chemical resistance, water repellency, stain resistance, and lubricity. SOLUTION: The cross-linked fluororesin composite material is produced by adding a fluorinated pitch powder to a fluororesin and cross-linking the fluororesin containing the fluorinated pitch powder by heating and/or by irradiating with a radiation and has a molecularly composited network structure formed by the reaction of the fluororesin and the fluorinated pitch.

Thermosetting resin composition and laminate using the same

Abstract: PROBLEM TO BE SOLVED: To provide a thermosetting resin composition which is especially used for manufacturing laminates or printed circuit boards and realizes an unprecedentedly high flame retardancy and chemical resistance, by retaining various physical properties required in laminates or printed circuit boards, i.e., a high adhesion to metals, heat resistance (solder heat resistance and glass transition temperature), dielectric properties, etc., and imparting a high flame retardancy and chemical resistance. SOLUTION: The thermosetting resin composition essentially comprises an inorganic filler (a) and has a compound (B) having a nitrogen atom and a oxygen atom in a resin structure of its cured product. Specifically, the inorganic filler (a) contains silica or a metal hydroxide (A), and the compound (B) is an isocyanuric acid derivative having a reactive functional group. COPYRIGHT: (C)2004,JPO

Corrosion-resistant coating composition, coating material and its coating film

Abstract: PROBLEM TO BE SOLVED: To provide a coating composition for coating a part having a complicated shape and a member having unevenness and flexure which excels in weatherability, chemical resistance, corrosion resistance, and lubricity. SOLUTION: The corrosion-resistant coating composition comprises (a) 10-80 wt.% epoxy resin (containing a curing agent), (b) 3-50 wt.% metallic flakes, and (c) 1-40 wt.% one or more lubricants selected from fluororesins (PTFE, TFE, PFA, EPE/FEP and the like), molybdenum disulfide, tungsten disulfide, and boron nitride (provided that the total amount dose not exceed 100 wt.%). COPYRIGHT: (C)2004,JPO

Water- and oil-repellent coating films

Abstract: The present invention provides a coating film having excellent stain resistance, water- and oil-repellency, chemical resistance and weather resistance as well as a method for preparing the coating film. The coating film satisfies the following requirements (i) and (ii) as to the atomic concentrations of silicon and fluorine present at its surface:2.1 ≤ NA(Si(90°)) ≤ 25.8 (i) 2.0 ≤ NA(F(90°)) ≤ 32.7 (ii).The coating film is also characterized by depth distributions of Si and F; Si is localized near the surface, and the concentration of F increases with receding from the surface. The coating film can be formed from a composition comprising a silicone-containing fluorine copolymer.