Showing papers on "Chemical resistance published in 2006"

Application of Modified Natural Oils as Reactive Diluents for Epoxy Resins

Abstract: Bisphenol A based low-molecular-weight epoxy resin was modified with epoxidized soybean oil, which exhibit viscosity reducing ability comparable to commercial grade active diluents. The studied compositions showed a non-Newtonian rheological behavior, typical for Bingham liquids. The values of the flow index (n) and the consistency index (k) for the compositions tested in the temperature range 25-65°c were calculated from the Ostwald-de Waele rheological model and were used to calculate the flow-activation energy (E a ) using the Arhenius equation. Studies of co-crosslinking of mixed oil-resin compositions using isophorone diamine showed essential decrease of the reaction heat and peak maximum temperature. Mechanical properties, thermal stability, water absorption and chemical resistance of the epoxy resin modified with natural oil, were also investigated. Compositions of epoxy resin Ruetapox 0162, modified with the oil diluent, preserved very good mechanical properties of the epoxy resins and demonstrated relatively low water absorption as well as high chemical resistance. The compositions displayed even higher impact strength than pure epoxy resin due to plasticizing effect of the built-in oil. Compositions with the high contents (up to 60 weight %) of the oil were flexible materials with fast elastic recovery.

Surface treatment for metal materials, surface treatment process, and surface-treated metal materials

Abstract: A surface treatment for metal materials obtained by incorporating an anionic water-dispersible resin (A) having a glass transition temperature of 0°C or above and at least one member (B) selected from the group consisting of alkali metal silicates and basic zirconium compounds in water, wherein the alkali metal silicates have M2O/SiO2 mass ratios of 1/1000 to 6/10 with M being at least one element selected from the group consisting of lithium, sodium and potassium; a surface treatment process; and surface-treated metal materials. The invention provides a chromium-free surface treatment for metal materials which is useful for imparting excellent corrosion resistance, chemical resistance, thermal discoloration resistance and weather resistance to metal materials. Additional incorporation of one or more members selected from among silane coupling agents, vanadium compounds, titanium compounds, organophosphonic acids, polyhydric alcohol phosphates, inorganic acids, salts thereof, metal fluorides, and metal oxides brings about further improvement in the performance of the treatment.

Negative photosensitive resin composition

Abstract: PROBLEM TO BE SOLVED: To provide a negative photosensitive resin composition which excels in performances such as adhesive force, heat resistance, insulation, flatness, chemical resistance and room-temperature storage stability and is suitable for an image forming material of a liquid crystal display element, which is suitable for use as an interlayer organic insulating film because of excellent sensitivity, film retention and UV transmittance particularly in the formation of an organic insulating film of a liquid crystal display element, and which can improve sensitivity and film retention when used as a resist resin for an overcoat, for a black matrix, for column spacers or for a color filter. SOLUTION: The negative photosensitive resin composition comprises (a) an acrylic copolymer obtained by copolymerizing (i) a phenylmaleimide compound, (ii) an allyl acrylic compound and (iii) an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride or a mixture of these, (b) a photoinitiator, (c) a polyfunctional monomer having an ethylenically unsaturated bond, (d) a silicon compound containing an epoxy group or an amine group, and (e) a solvent. COPYRIGHT: (C)2008,JPO&INPIT

Alkyd–epoxy blends as multipurpose coatings

Abstract: The alkyd resins of three different compositions based on nahar seed oil (Mesua ferrea), phthalic anhydride, and maleic anhydride were synthesized by an alcoholysis method. These alkyd resins were blended with a commercially available epoxy resin (Araldite 250, Ciba Geigy, Mumbai, India) separately to study the performance of the blends as coatings. The morphology of the blends was studied with scanning electron microscopy. The drying time, gloss, flexibility, pencil hardness, adhesion, pressure test, and chemical resistance under different conditions were measured for this purpose. The thermal characteristics of the blends were also investigated by thermogravimetric analysis. The studies showed better performance of the blends with respect to the drying time, hardness, flexibility, gloss, pressure test, thermal stability, and chemical resistance. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 516–521, 2006

Thermosetting resin composition and cured film

Abstract: PROBLEM TO BE SOLVED: To provide a cured film especially excellent in flatness and heat resistance and also in solvent resistance and chemical resistance such as acid resistance and alkali resistance, and adhesion to a substrate such as glass and also excellent in transparency, scratch resistance, applicability, and light resistance and to provide a resin composition which gives the cured film. SOLUTION: The thermosetting resin composition is a resin composition comprising a polyester amic acid obtained by reacting a tetracarboxylic acid dianhydride, a diamine, and a polyhydroxy compound as essential components, an epoxy resin containing 3-20 epoxy groups and having a weight-average molecular weight of below 5,000, and an epoxy curing agent, wherein 20-400 pts.wt. epoxy resin is present per 100 pts.wt. polyester amic acid, and 0-13 pts.wt. epoxy curing agent is present per 100 pts.wt. epoxy resin. COPYRIGHT: (C)2008,JPO&INPIT

Water-based surface treatment agent for metal, surface treatment method for metal, and surface-treated metallic material

Abstract: PROBLEM TO BE SOLVED: To provide a chromium-free water-based surface treatment agent for a metal, which can impart the metal corrosion resistance, blackening resistance and thermal-yellowing resistance which are equivalent to or more excellent than those of a chromate film, and chemical resistance, adhesiveness to a coating film, fingerprint resistance and formability as well, and is stable for a long period of time in a wide pH range even when kept in high concentration. SOLUTION: The chromium-free water-based surface treatment agent (A) for a metal includes at least one of vanadium compounds (a) shown by the general formula (I), wherein M represents a cation; P represents an anion containing phosphor; F presents an anion containing fluorine; x is 0 to 10, y is 0 to 10, z is 0 to 10, w is 0 to 10, and z+w=0.2 or more; and the valency of V is four or three. COPYRIGHT: (C)2007,JPO&INPIT

Effect of chemical reagents on the mechanical properties of natural fiber polypropylene composites

Abstract: Chemical resistance of natural fiber (wood flour, rice hulls, kenaf fiber, and newsprint) polypropylene composites was studied in terms of their weight loss and reduction of mechanical properties after 7 days immersion in chemical reagents. Composites containing 25 and 50% of various natural fibers and polypropylene were prepared and immersed in NaOH (10%), NaClO (bleach solution) (13%), HCl (10%), H2O2 (3%), soap solution (1%), and acetone. Results indicated that H2O2, soap solution, and acetone had very negligible effects on all composites. On the other hand, the effects of NaClO and HCl were found to be statistically significant. Different fibers exhibited different behaviors regarding their chemical resistance. Rice hulls composites were considerably affected by NaOH, whereas the same chemical reagent was ineffective on other fibers. The effects of bleach solution and HCl on the mechanical performance of the composites were found to be critical. Generally, it was concluded that bleach and acids had the highest effects on natural fiber polypropylene composites. POLYM. COMPOS. 27:563–569, 2006. © 2006 Society of Plastics Engineers

Plasma-sprayed graded ceramic coatings on refractory materials for improved chemical resistance

Abstract: Plasma-sprayed ceramic coatings were manufactured on sintered alumina–mullite refractory bricks to improve their chemical resistance to molten glass. Mullite and alumina powders were employed. Graded layered coatings were designed and produced, to reduce the thermal expansion mismatch with the substrate: in all cases, the upper layer consisted in pure alumina (very resistant to chemical attack); alumina–mullite intermediate layers were added to match the low thermal expansion of the porous substrates. Plasma-sprayed coatings definitely improved both the abrasion resistance and the chemical resistance to long-time (8 h at 1400 °C) contact with molten glass, since the coating preserved its original microstructure. However, in thermal shock tests, some transverse cracks appeared; thus, thermal cycling tests in presence of molten glass indicated that, after a few cycles, the glass can penetrate down to these cracks. The tested samples were studied by means of scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS) and X-ray diffraction (XRD).

Aqueous surface-treating agent for metal material and surface-coated metal material

Abstract: Disclosed is an aqueous surface-treating agent for metal materials, which is obtained by blending a water-dispersible urethane resin (A), at least one organic compound (B) and a zirconium compound (C) in water. The water-dispersible urethane resin (A) has a glass transition temperature of more than 50˚C and a lowest film-forming temperature of not more than 40˚C, and the at least one compound (B) is selected from the group consisting of methylolated phenols and condensates thereof, carbodiimide resins, epoxy resins, silane coupling agents, organic phosphonic acids and partial alkali metal salts/ammonium salts/alkyl esters thereof, organic phosphinic acids, phosphoric acid esters of polyols, amine compounds, isocyanate compounds, aldehyde compounds, carboxylic acids, amino resins, and urethane prepolymers wherein an isocyanate group is protected by adding a disulfonic acid alkali metal salt thereto. Also disclosed is a metal material treated with such a surface-treating agent. The aqueous surface-treating agent is capable of forming a film which is excellent in corrosion resistance, formability, chemical resistance and moisture resistance, and the metal material of this invention is coated with such a film.

Photosensitive resin composition and black matrix using the same

Abstract: A photosensitive resin composition suitable for the production of a light-shielding black matrix for use in a liquid crystal display is disclosed. The photosensitive resin composition includes a cardo binder resin and a carboxyl group-containing polyfunctional monomer and exhibits superior physical properties, such as heat resistance, chemical resistance, development margin, developability and adhesive properties. Further disclosed is a black matrix produced using the photosensitive resin composition. The black matrix has superior physical properties, including heat resistance, chemical resistance, development margin and adhesive properties. Particularly, since the black matrix has excellent developability with an alkaline solution, it contains no undissolved material of the composition in radiation-unexposed portions.

Modified polyimide resin containing polycarbonate, its composition and cured insulation film

Abstract: PROBLEM TO BE SOLVED: To provide a new modified polyimide resin containing a polycarbonate, which is soluble in an organic solvent, excellent in both electric insulation and adhesiveness, and further excellent in such as heatresistance, flexibility, low camber property, solvent resistance, chemical resistance and bending resistance, and to provide a resin composition comprising the resin and a cured insulation film. SOLUTION: The present invention relates to a modified polyimide resin and is produced by a reaction of (a) a diisocyanate compound, (b) one or more diol compounds containing a polycarbonate with a bifunctional hydroxy group terminal and (c) an imide oligomer with a bifunctional hydroxy group terminal, a resin composition comprising the modified polyimide resin and a cured insulation film using the resin composition. COPYRIGHT: (C)2007,JPO&INPIT

Alumina‐Incorporated Polyesteramide from Non‐Edible Seed Oils

Abstract: To improve the physico‐mechanical and chemical resistance properties, lower the curing temperature of annona squamosa and pongamia glabra seeds oils based polyesteramides [ASPEA, PGPEA], as well as to convert the non‐edible seed oils into value added products, their respective alumina‐incorporated polyesteramides resins [Al‐ASPEA, Al‐PGPEA] have been synthesized. The resins and their coatings have been tested for their chemical, physico mechanical and chemical/corrosion resistance properties. These properties were compared among the prepared resins and with that of previously reported alumina filled linseed polyesteramide [Al‐LPEA]. It was observed that Al‐PGPEA‐71, which has the highest amount of oleic acid chains, shows the best physico‐mechanical and chemical resistance properties.

Chemical resistance evaluation of polystyrene / polypropylene blends : effect of blend compositions and SEBS comtent

Abstract: Polystyrene (PS) is widely used in packaging, building and construction, and injection molding application due the advantages of being clear, hard, easily processed and low cost. However PS lack in toughness and chemical resistance towards certain chemical such as ketones. Blends of PS with Polypropylene (PP) are developed with the objective to enhance the impact and chemical resistance of PS. However, the blends of PS and PP are known to be immiscible and incompatible. Previous studies have concluded that the block copolymer such as styrene-b-(ethylene-co-butylenes)-b-styrene (SEBS) is good compatibilizer for this PS/PP blends. The present study investigates the effect of SEBS on the chemical resistance on the PS/PP blends. Using a Brabender PL2000 twin-screw extruder, blends of PS/PP in various composition ranging of 90-60 wt % PS containing different amount of SEBS in the composition range of 5-25 phr were prepared and injection molded to evaluated for chemical resistance. The chemical resistance testing was carried out according to ASTM D543-87. The specimens were placed in appropriate containers for the reagents being used, and allow the specimens to be totally immersed in fresh reagent for 7 days in the Standard Laboratory Atmosphere. The results show the chemical resistance of PS to acetone (ketone) increases with increasing PP content. On the other hand, the chemical resistance of PS/PP blends increases with increasing SEBS content at lower PP content. However, at higher PP content, the chemical resistance decreases with increasing SEBS content.

Flow modified epoxy resin: the complete solution of aerosol in 2‐pack epoxy adhesive

Abstract: Purpose – To reduce the cost of epoxy adhesive without affecting the properties of epoxy adhesive in two pack system.Design/methodology/approach – For effective toughening, adhesion, chemical resistance, etc. various compositions were made by incorporating flow modified solid epoxy resin. The impact, adhesive strengths and some other properties of the unmodified and modified epoxy networks were characterised.Findings – The modification of epoxy resin using flow modified solid epoxy resin showed significant enhancement of impact and adhesive strengths and chemical resistance over the unmodified one. The optimum results were obtained at 13.66 parts per hundred parts of epoxy resin (phr) of modifier by replacing 4.33 phr of aerosil.Research limitations/implications – The modifier, 7004 FM, used in the present context was high molecular weight flow modified epoxy resin. Besides, these results could be obtained from other grades of flow modified high molecular weight epoxy resin. In addition, the efficiency of...

Functional coating compositions of perfluoroalkyl perfluoro-phthalocyanine compounds

Abstract: Coating compositions comprising perfluoroalkyl metallo and non-metallo perfluoro- phthalocyanine compounds and associated coating methods are provided by the present invention. Perfluoroalkyl metallo and non-metallo perfluoro-phthalocyanine compounds are suitable for use as functional coatings and may be optionally combined with conductive polymers. The functional properties imparted generally include one or more of chemical resistance, thermal resistance, biological and chemical non-stick surface behavior, electrochromism, variable electromagnetic field signatures, and/or non-linear optical properties. Advantages of the disclosed perfluoroalkyl metallo and non-metallo perfluoro- phthalocyanine coatings include the fact that an inert uninterrupted fluorinated surface provides for improved hydrophobic properties at the periphery while exhibiting improved hydrophilicity at the center, which in turn results in one or more of the following properties: variable optical, electric and magnetic properties; enhanced durability; and enhanced resistance to chemical and biological surface contamination.

Coating material composite and coated article

Abstract: It is aimed at providing a coating material composite capable of having a lower refractive index and keeping higher antiscratching property, antifouling property, chemical resistance, and anticrack property even when the coating material composite is used to form a coating on a malleable substrate such as plastic substrates and exposed to high temperatures upon formation of the coating and after formation of the coating. There is provided a coating material composite containing: a silane compound represented by the following general formula (A); and an epoxy group-containing organic compound containing one or more epoxy groups in each molecule; wherein the silane compound has a content of 60 to 97% by weight relative to a total amount of resin components; and wherein the epoxy group-containing organic compound has a content of 3 to 10% by weight relative to the total amount of resin components; XmR1 3−mSi—Y—SiR1 3−mXm (A) [R1 is a monovalent hydrocarbon group having a carbon number of 1 to 6; Y is a divalent organic group containing one or more fluorine atoms; X is a hydrolytic group; and m is an integer of 1 to 3]. The coating formed by such a coating material composite is capable of keeping a higher anticrack property even upon exposure to high-temperature.

Thermosetting polymer composition

Abstract: PROBLEM TO BE SOLVED: To provide a hardened film excellent in chemical resistance such as solvent resistance, acid resistance and alkali resistance, water resistance, adhesion to a substrate like glass, transparency, crack resistance, coating property, flatness, light resistance, foreign matter characteristics and thermostability, and provide a polymer composition giving the hardened film. SOLUTION: The thermosetting polymer composition comprises a polyester compound which is obtained by reacting a tetracarboxylic acid dianhydride and a polyhydroxy compound, an N-substituted maleimide copolymer and a solvent. The N-substituted maleimide copolymer is a copolymer of a N-substituted maleimide and a monomer with an oxiranyl or a copolymer of a N-substituted maleimide and a monomer with an oxetanyl. COPYRIGHT: (C)2007,JPO&INPIT

Polyamide-polyphenylene ether-based resin film

Abstract: PROBLEM TO BE SOLVED: To provide a polyamide-polyphenylene ether-based resin film excellent in heat resistance, low water absorptivity, chemical resistance, tear resistance, heat-resistant mechanical strength and electrical properties. SOLUTION: The film is made from a resin composition comprising (A) 5-60 pts.mass of a polyphenylene ether-based resin, (B) 95-40 pts.mass of a semiaromatic polyamide resin composed of (a) dicarboxylic acid units including 60-100 mol% of terephthalic acid units and (b) diamine units including 60-100 mol% of 1,9-nonanediamine units and/or 2-methyl-1,8-octanediamine units, and (C) 0.01-2 pts.mass of a compatibilizing agent. The resin composition has a shearing viscosity(measured at 320°C and a shearing rate of 121.6 s -1 using a capillograph with a capillary length of 10 mm and a capillary diameter of 1 mm) of 30-900 Pa×s. The film, which is 1-200μm in thickness, has the following characteristics: The component A has a dispersed phase 0.6-2.0μm in average particle size, the component B has a morphology as continuous phase, and the terminal amino group concentration of the component B is greater than 45μmol/g but less than 75μmol/g. COPYRIGHT: (C)2007,JPO&INPIT

Polymer-coated silica

Abstract: PROBLEM TO BE SOLVED: To provide polymer-coated silica which has high hydrophobicity and is used as a polymer material filler for improving the compatibility with various hydrophobic organic materials to be blended in order to improve the physical/mechanical performance (for example, degradation resistance to light, water resistance, oil resistance, chemical resistance, contamination resistance, antiadhesiveness, wear resistance, water repellency and fluidity) such as strength, toughness, impact strength and thermal stability of a polymer material such as paint, rubber, a resin and a molding material. SOLUTION: The polymer-coated silica is obtained by treating hydrophilic silica with an amino alkylsilane compound (A) represented by general formula (1): H 2 N-(R 1 -NH)n-R 2 -Si-(R 3 )(R 4 )(R 5 ) (wherein R 1 is a 1-4C alkylene group; R 2 is a 1-4C alkylene group; R 3 , R 4 and R 5 are each a hydrogen atom, a 1-3C alkyl group or a 1-3C alkoxyl group independently; n is an integer of 0-5) and further treating the resulting hydrophilic silica with a polymer (B) containing an ethylenic unsaturated carboxylic acid as a constituent unit. COPYRIGHT: (C)2008,JPO&INPIT

Polycarbonate resin composition having good chemical resistance and flowability

Abstract: The polycarbonate resin composition having good chemical resistance and flowability according to the present invention comprises (A) 0.5 to 10 parts by weight of a polycarbonate resin, (B) 0.5 to 10 parts by weight of a syndiotactic polystyrene resin, (C) 1 to 30 parts by weight of a core-shell graft copolymer, and (D) 0.01 to 10 parts by weight of a phosphoric acid ester.

Production method for polyamide resin composition

Abstract: PROBLEM TO BE SOLVED: To provide a polyamide resin composition more improved in resistance to heat aging and suppressed in corrosion and deposition of copper without deteriorating mechanical properties, heat resistance and chemical resistance which are obtainable from a conventional polyamide resin and to provide its production method. SOLUTION: The production of the polyamide resin composition involves the production of a polyamide resin which is obtained by addition of (A) an end modifier containing carboxylic groups, (B) a copper compound and (C) a halogen compound in the process of polymerization. The resin has 55-85% carboxylic group concentration ratio, 0.001-0.0250 pt.wt. copper compound on the basis of 100 pts.wt. polyamide in terms of a copper element and 7-40 of the molar ratio of halogen to copper (halogen/Cu) in the halogen compound. The production of the composition is carried out by the followings. After addition of the component (A), the components (B) and (C) are added thereto by their mixed aqueous solution in the process of polymerization at the stage of 1-15 wt.% moisture content. COPYRIGHT: (C)2007,JPO&INPIT

Extrudable acrylic compositions

Abstract: A novel extrudable acrylic composition having suitable physical and chemical resistance properties may also be thermoformable. Specific resistance to solvent crazing is desirable. Such compositions can be formed using a combination of a multifunctional chain transfer agent and a multifunctional crosslinking agent.

Polyether sulfone fiber and preparation method and application thereof

Abstract: The invention discloses a polyethersulfone fiber, making method and appliance in the resin spinning domain, which is characterized by the following: the fineness of signal fiber is between 0.3 and 30 dt, wherein the limited oxygen index equals to and more than 30 when the fineness is between 1.5 and 10 dt; adapting twin-screw extruder to heat and melt the polyethersulfone resin; forming the fiber by cooling and solidifying at the high temperature-resistant spinning component pattern of fondant rill. The invention comprises the following advantages: heat resistance, flame-proof, chemical resistance, good physical mechanical property and so on, which can be used in the textile of flame-proof and or heat resistance or chemical resistance and physical mechanical property need as reinforced material in the compound material.

Manufacturing process of polyamide resin composition and polyamide resin composition

Abstract: PROBLEM TO BE SOLVED: To provide a polyamide resin composition which exhibits an improved heat resistant aging characteristic and a controlled copper deposition at no expense of the mechanical properties, heat resistance and chemical resistance inherent in the existing polyamide resins and its manufacturing process. SOLUTION: The manufacturing process of the polyamide resin composition involves a polyamide polymerization step to obtain a resin composition by adding at least one kind of reducing phosphorus compound and a polyamide resin manufacturing step to manufacture the polyamide resin composition by adding a copper compound and a halogen compound (except for a copper halide) to the polyamide resin. COPYRIGHT: (C)2008,JPO&INPIT

Polymer alloy composition

Abstract: Provided is a polymer alloy composition having excellent fatigue resistance, impact resistance and chemical resistance. The composition comprises 30 to 80 % by weight of a polycarbonate resin, 20 to 70% by weight of a polyester resin having an intrinsic viscosity of 1.2 to 2, and 0.5 to 20 parts by weight of an impact modifier, based on 100 parts by weight of the polycarbonate resin and the polyester resin.

Surface protection sheet for solar cell module

Abstract: PROBLEM TO BE SOLVED: To provide a low price and safe surface protection sheet for solar cell modules rich in transparency for transmitting sunlight, excellent in strength, excellent in durability such as weatherability, heat resistance, water resistance, light resistance, wind resistance, hail resistance, chemical resistance, and puncture resistance, and excellent in easiness of inventory control of materials because only one raw material is required for different applications due to the characteristics that the film thickness of a thermosetting transparent resin layer can be freely controlled. SOLUTION: The surface protection sheet for solar cell modules comprises a substrate film and a thermosetting transparent resin layer formed on the film. The thermosetting transparent resin layer comprises a resin prepared by copolymerizing a vinyl ester resin, a monomer which is copolymerizable with the vinyl ester resin and whose homopolymer has a Tg of -20°C or lower, and a monomer which is copolymerizable with the vinyl ester resin and whose homopolymer has a Tg of 120°C or high. COPYRIGHT: (C)2006,JPO&NCIPI

Thermoplastic resin composition and molded products thereof

Abstract: PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition having an excellent balance among chemical resistance, coating appearance, rigidity and heat resistance without impairing mechanical properties. SOLUTION: To the resin composition in which a graft copolymer, a saturated polyester resin, a polycarbonate resin are incorporated, a modified vinyl based copolymer is added to obtain the thermoplastic resin composition excellent in impact resistance and having an excellent balance among chemical resistance, coating appearance, rigidity and heat resistance. COPYRIGHT: (C)2006,JPO&NCIPI