Showing papers on "Chemical resistance published in 2012"
TL;DR: In this article, the authors presented a series of PMO thin films that combine an ultra-low-k value, a hydrophobic property and a high resistance against aggressive chemical conditions.
Abstract: Periodic mesoporous organosilicas (PMOs) are one of the most promising candidates to be used as ultra-low-k dielectrics in microelectronic devices. In this paper, PMO thin films that combine an ultra-low-k value, a hydrophobic property and a high resistance against aggressive chemical conditions are presented. The films are synthesized via spin-coating of a 1,1,3,3,5,5-hexaethoxy-1,3,5-trisilacyclohexane, hydrochloric acid, water and ethanol mixture using polyoxyethylene (10) stearyl ether as a porogen template. The obtained highly porous films are hydrophobic, crack-free and an ultra-low k-value of 1.8 is achieved. Finally, the chemical resistance of these PMO films against alkaline solutions is investigated in detail and compared with the resistance of mesoporous silicas and PMOs synthesized with cetyl trimethylammonium chloride.
59 citations
TL;DR: In this article, the synthesis of new PFPE (meth)acrylic oligomers by extending OH-terminated fluorinated chains with urethane groups and reactive acrylic functions is described.
Abstract: Perfluoropolyether (PFPE) structures can be functionalized with acrylic groups using appropriate hydrogenated acrylic monomers: the macromers obtained are highly reactive under UV irradiation, and fluorinated polymers can be obtained. In the first part of this work is described the synthesis of new PFPE (meth)acrylic oligomers by extending OH-terminated fluorinated chains with urethane groups and reactive acrylic functions. The photopolymerization reaction of each product is then reported followed by the characterisation of the main thermal, mechanical and surface properties of UV-cured coatings. The polymers have good thermal resistance and fair mechanical and chemical resistance. More interestingly they show very low refractive index and low surface tension. For these latter properties the products can be advantageously used in highly demanding applications such as photonic devices and nano-patterning. Copyright © 2011 Society of Chemical Industry
53 citations
TL;DR: In this paper, the change in surface morphology due to the addition of compatibilizer and nanoparticles was studied by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR).
Abstract: Wood polymer nanocomposite (WPNC) was developed by using high-density polyethylene (HDPE), low-density polyethylene (LDPE), polypropylene (PP), polyvinyl chloride (PVC), wood flour (WF), polyethylene-co-glycidyl methacrylate (PE-co-GMA), and different nanoparticles viz. nanoclay, SiO2, and ZnO. The distribution of nanoparticles was examined by X-ray diffraction (XRD) study. The change in surface morphology due to the addition of compatibilizer and nanoparticles was studied by scanning electron microscopy (SEM). The surface modification of nanoparticles by organic surfactant and their interaction with polymer and wood was studied by Fourier transform infrared spectroscopy (FTIR). The UV resistance property was improved after the incorporation of clay, SiO2, and ZnO. Bacterial degradation of WPC was found to increase linearly with the incorporation of clay and nanoparticles. The degraded samples showed lower mechanical properties. Flame retarding property, chemical resistance, and water vapor resistance wer...
46 citations
TL;DR: In this paper, the effect of the nature of the supplementary cementing materials (SCMs) as well as the curing time on the chemical and the physical modifications of cement pastes and on the compressive strength, mass loss, altered depth and microstructure of mortars immersed in acetic acid at a pH of 4.
43 citations
Patent•
03 Jul 2012TL;DR: In this article, an inorganic filler that is soluble in an acid, a cyanic acid ester compound and an epoxy resin is used to create a roughened surface.
Abstract: Provided is a resin composition which enables the formation of a roughened surface having a low roughness degree on the surface of an insulation layer in a printed wiring board material when used on the insulation layer regardless of the roughening conditions employed and also enables the formation of a conductive layer having excellent adhesion properties, heat resistance, heat resistance under absorption of moisture, thermal expansion properties and chemical resistance on the roughened surface. A resin composition comprising (A) an inorganic filler that is soluble in an acid, (B) a cyanic acid ester compound and (C) an epoxy resin.
43 citations
TL;DR: In this article, the mechanical and chemical properties of metakaolin activated by alkaline blends of sodium silicate and sodium hydroxide were characterized and two formulations of highest strength were chosen to evaluate their chemical resistance after immersion for 10 days in 0.5 N HCl solutions at 60°C.
Abstract: The Mechanical and chemical properties of inorganic polymers based on metakaolin activated by alkaline blends of sodium silicate and sodium hydroxide were characterized. Twenty-four formulations were elaborated with variable molar composition SiO2/Al2O3 (2.6–3.0), Na2O/Al2O3 (0.55–0.7), and H2O/Solids (0.53–0.57). The effect of the chemical composition on the compressive strength development was first investigated. Infrared spectroscopy showed that the condensed reaction products were formed by bonds of T–O–T (T = Si and/or Al) and water retained.
Two formulations of highest strength were chosen to evaluate their chemical resistance after immersion for 10 days in 0.5 N HCl solutions at 60°C; the compressive strength and microstructural changes were characterized. Before the acid exposure the strengths reached up to ~80 MPa, and after acid attack, the loss of strength was a function of the SiO2/Al2O3 ratio. Infrared spectroscopy and electron microscopy suggested that the deterioration was due to the destruction of the polymeric network with migration of Na and Al toward the solution and the incorporation of H3O+ and ingress of Cl− ions in the corroded structure; however, the chemical resistance was good considering the aggressiveness of the acid solutions.
34 citations
Patent•
26 Jul 2012
TL;DR: In this article, a photo-curable organic-inorganic hybrid composite was proposed for use as an insulating material and an encapsulating material for a protective film of optical devices including display devices and semiconductors.
Abstract: The present invention relates to a photo-curable organic-inorganic hybrid composition, more particularly to a photo-curable organic-inorganic hybrid resin composition having superior physical properties such as UV resistance, chemical resistance, light transmittance, adhesive property, insulating property, heat resistance, flatness and water resistance and in particular, having excellent heat resistance and adhesive property enabling the composition to endure a thermal deformation caused by a processing temperature change during post-process after a film is cured. Thus, the composition of the invention is suitable for use as an insulating material and an encapsulating material for a protective film of optical devices including display devices and semiconductors.
19 citations
Patent•
27 Jun 2012
TL;DR: In this paper, a dual-component aqueous polyurethane paint with scrawling resistance and pasting resistance is presented, which is suitable for application fields of municipal public facility, building paint and terrace paint coating.
Abstract: The invention discloses a dual-component aqueous polyurethane paint with scrawling resistance and pasting resistance, and a preparation method thereof. The dual-component aqueous polyurethane paint with scrawling resistance and pasting resistance is prepared by using aqueous hydroxy-containing polyacrylic resin dispersion and fatty group polyisocyanate as main film forming substances, adding organosilicon resin emulsion, deionized water, antifoaming agent, wetting agent, dispersant, pigment, dulling agent, wax emulsion and thickening agent and carrying out high speed disperse. The paint has characteristics of high crosslinking density, low surface tension, strong permeability resistance, good scratch resistance, substantial scrawling resistance and pasting resistance, excellent performances of low VOC content, high hardness, good weatherability, brushing resistance and chemical resistance, and is suitable for application fields of municipal public facility, building paint and terrace paint coating, etc.
19 citations
Patent•
18 Jul 2012
TL;DR: In this paper, a tungsten-polymer composite material and a preparation method for its preparation is described. But the tungstens powder is not used in the preparation of the material.
Abstract: The invention discloses a tungsten-polymer composite material and a preparation method thereof. The tungsten-polymer composite material comprises the following components in percentage by weight: 20-100% of polymers, 950-1000% of tungsten powder, 0-50% of tungsten fibers, 0.5-5% of coupling agent and 0.5-10% of other auxiliaries, wherein the tungsten powder is prepared through airflow pulverization and surface modification. The tungsten powder disclosed by the invention is good in compaction and flowability and high in loading capacity. The composite material disclosed by the invention is good in physical and mechanical properties, and excellent in weathering resistance, chemical resistance and organic solvent resistance, not only can be applied to the field of ray shielding, but also can be applied to the fields of vibration isolation, weight counterbalance, heat conduction, weapons and ammunitions and the like.
17 citations
Patent•
22 Aug 2012
TL;DR: In this paper, an ultraviolet curing coating is characterized by comprising basic resin, a diluting agent and a light initiator, wherein the basic resin comprises urethane acrylate resin and self-initiating polyester acryl-polyester resin; and the light initiate comprises normal light and low-yellowing light initiators.
Abstract: The invention discloses an ultraviolet curing coating The ultraviolet curing coating is characterized by comprising basic resin, a diluting agent and a light initiator, wherein the basic resin comprises urethane acrylate resin and self-initiating polyester acrylate resin; and the light initiator comprises normal light initiator and low-yellowing light initiator The coating provided by the invention has high curing activity; a paint film has the advantages of high hardness, high wear resistance, superior chemical resistance, low yellowing, high weather resistance and the like; and the coating is suitable for various plastic materials
16 citations
TL;DR: In this article, the influence of SiAlON nanoparticles loading level (0-12 wt%) was investigated on the mechanical and chemical properties of epoxy resin-based nanocomposites coatings.
Abstract: In this work, the influence of SiAlON nanoparticles loading level (0–12 wt%) was investigated on the mechanical and chemical properties of epoxy resin-based nanocomposites coatings. The samples were characterized by fracture toughness, chemical, pull off, hardness and abrasion tests, followed by scanning electron microscopy of the fracture surfaces and sample surface after performing a chemical test. Nanoparticles were also characterized by transmission electron microscopy and linear light scattering analysis techniques. Epoxy resin coating based on bisphenol A was treated with polyamine hardener as a curing agent. Fracture toughness measurements were carried out using a single edge notched bend specimens within a three-point bending test at room temperature. Effect of SiAlON nanoparticles on the chemical resistance of epoxy resin was investigated by immersion of samples in 3.5 wt% NaCl solution at 85 °C for 60 days. Results indicated the enhancements in the mechanical properties and chemical resistance of epoxy nanocomposite due to the addition of small parts of SiAlON nanoparticles. The contents of samples with 3 and 5 wt% of SiAlON nanopowders have been considered as optimum contents compared to the other samples. They showed improvement in the crack propagation resistance in chemical solution and fracture toughness tests, both. Enhancment in abrasion resistance was found at either of 3 and 5 wt% SiAlON epoxy nanocomposite samples where they showed 59 and 34% abrasion resistance more than that of the neat resin, respectively.
Patent•
28 Jun 2012
TL;DR: In this paper, cross-linked oligomers made from cyclic carbosilane monomers are used to produce low k dielectric films/layers, which exhibit high porosity and strong resistance to chemical attack while also exhibiting improved hydrophobicity.
Abstract: Low k dielectric films/layers can be produced by cross-linking oligomers made from cyclic carbosilane monomers. The films may exhibit high porosity and strong resistance to chemical attack while also exhibiting improved hydrophobicity. Oligomers may be cross-linked in situ after coating on a substrate such as a silicon wafer. Resulting cross-linked layers may be further treated to improve chemical resistance and reduce water uptake.
TL;DR: In this article, a modification of conventional epoxy resin by blending with four different phenolic-urea oligomers is presented. But the authors focus on the use of phenol, m-cresol, resorcinol and 1,5-dihydroxy naphthalene for fabricating glass fiber reinforced laminates.
Patent•
15 Jun 2012
TL;DR: The photo-curable thermosetting resin composition comprises a carboxyl group-containing photosensitive resin having a structure represented by general formula (1) and a photopolymerization initiator, wherein Ris an alkylene oxide group having a (meth)acryloyl group as discussed by the authors.
Abstract: PROBLEM TO BE SOLVED: To provide a dilute alkali development-type photo-curable thermosetting resin composition which is suitable for use in obtaining a cured coating film which exhibits excellent adhesion with a substrate, chemical resistance, solder heat resistance, PCT resistance, thermal shock resistance, electroless gold plating resistance, electrical insulation properties, etc.SOLUTION: The photo-curable thermosetting resin composition comprises a carboxyl group-containing photosensitive resin having a structure represented by general formula (1) and a photopolymerization initiator, wherein Ris an alkylene oxide group having a (meth)acryloyl group, an alkylene oxide group with which a polybasic acid anhydride is reacted, or an alkylene oxide group.
TL;DR: In this paper, a hyperbranched epoxy resin has been synthesized by using epichlorohydrin, bisphenol-A, and hyperbranched polyether polyol by a low-temperature polycondensation technique.
Abstract: A hyperbranched epoxy resin has been synthesized by using epichlorohydrin, bisphenol-A, and hyperbranched polyether polyol by a low-temperature polycondensation technique in the presence of a base. The reaction parameters of this polycondensation reaction were optimized, and 5 N aqueous sodium hydroxide solution, (54 ± 1) °C reaction temperature and 3 h reaction time were found to be the best. The degree of branching of the resin was found to be 0.57 as determined from 13C nuclear magnetic resonance spectroscopy (Fig. 3). This hyperbranched epoxy resin was cured with poly(amido amine) hardener at 120 °C for a specified period of time. The resin exhibits very good crosscut adhesive strength (100%). The cured films showed moderate impact strength (60 cm), good scratch resistance (5.5 kg), good gloss (82 at 60°), thermostability up to 270 °C, and good chemical resistance in various chemical media. All these results indicate its suitability to be used as an advanced surface coating material.
TL;DR: In this article, the mechanical, chemical and morphological properties of cast polyurethane samples containing barium sulphate, calcium carbonate, kaolin and quartz fillers were investigated.
Abstract: For industrial applications of engineering polymers such as polyurethane, polyamides and polyesters, the addition of suitable reinforcing inorganic fillers is a practical and convenient method to achieve the desirable mechanical and chemical properties. In this study, the mechanical, chemical and morphological properties of cast polyurethane samples containing barium sulphate, calcium carbonate, kaolin and quartz fillers were investigated. In the formulation of these samples, the ranges of inorganic filler were 0–40 phr. The results of mechanical property tests, such as tear resistance, tensile strength, elongation at break, Young’s modulus, hardness and abrasion resistance, were evaluated. The chemical resistance of the samples was determined against xylene and methyl ethyl ketone. The chemical resistance of the filled cast polyurethane was determined by the solubility parameters of polymer/solvent. Finally, the experimental results and SEM images showed that samples containing 30 phr calcium carbonate produced the best results.
TL;DR: In this paper, the authors reported chemical treatment of pigment titanium dioxide (TiO2) with silicone to give surface functionalized TiO2, which was confirmed by Fourier Transform Infra Red Spectroscopy, Scanning Electron Microscopy and Dynamic Light Scattering analysis.
Patent•
08 Mar 2012
TL;DR: A waterproof cellulose sheet comprises a nonwoven fabric composed of fine cellulose fibers having a number average fiber diameter of 500 nm or less and satisfies all the following requirements as discussed by the authors.
Abstract: PROBLEM TO BE SOLVED: To provide a waterproof cellulose sheet composed of fine cellulose fibers which has properties peculiar to cellulose such as heat resistance, chemical resistance, high elastic modulus and high adsorption performance derived from high surface activity, and has high porosity and high durability to water.SOLUTION: A waterproof cellulose sheet comprises a nonwoven fabric composed of fine cellulose fibers having a number average fiber diameter of 500 nm or less and satisfies all the following requirements (1) to (4): (1) a weight ratio of the fine cellulose fibers of 1 wt.% or more and 99 wt.% or less, (2) a porosity of 50% or more, (3) a tensile strength corresponding to a basis weight of 10 g/mof 6 N/15 mm or more, and (4) a ratio of dry tensile strength to wet tensile strength of 50% or more.
TL;DR: In this paper, the additive effect of methyl acrylate (MA), vinyl acetate (VA) and styrene (Sty) on percentage grafting, properties and the behavior of the fiber, in binary vinyl monomeric mixtures was investigated.
Abstract: The reaction parameters for the graft co-polymerization of efficient Butyl acrylate (BA) monomer onto Hibiscus sabdariffa (Roselle) stem fiber were optimized and used to further explore the additive effect of methyl acrylate (MA), vinyl acetate (VA) and styrene (Sty) on percentage grafting, properties and the behavior of the fiber, in binary vinyl monomeric mixtures. The graft co-polymers were characterized by XRD, TGA, DTA, SEM and FTIR techniques and evaluated for physico-chemical changes like moisture absorption, swelling behavior, dye uptake studies and chemical resistance against 1N NaOH and 1N HCl. With increase in percentage grafting the percentage crystallinity, crystallinity index, and hydrophylicity were reduced whereas there was an increase in physico-chemico-thermal resistance, hydrophobicity, miscibility with organic solvents as a result of morphological transformation in these fibers. These modified graft copolymers were then used as reinforcement in phenol-formaldehyde polymer matrix as reinforcement and evaluated mechanically for modulus of elasticity, modulus of rupture, stress at the limit of proportionality and hardness. The composites reinforced with grafted fiber had better strength than raw fiber reinforced composites and phenoplast.
Patent•
04 Jul 2012
TL;DR: In this article, a thermo-oxidative ageing-resistant nylon/acrylonitrile-butadiene-styrene resin blending material is presented, which has high impact property, chemical resistance and mechanical properties, can be used as manufacturing materials of shells of automobile accessories, electric tools, office equipment and the like.
Abstract: The invention discloses a thermo-oxidative ageing-resistant nylon/acrylonitrile-butadiene-styrene resin blending material. The thermo-oxidative ageing-resistant nylon/acrylonitrile-butadiene-styrene resin mixed material comprises the following components in part by weight: 25 to 75 parts of nylon resin, 10 to 30 parts of acrylonitrile-styrene copolymer, 10 to 40 parts of acrylonitrile-butadiene-styrene copolymer, 5 parts of maleic anhydride-grafted acrylonitrile-styrene copolymer compatibilizer, 0.2 to 0.5 part of main antioxidant and 0.2 to 0.5 part of auxiliary antioxidant. By adoption of the technical scheme, the thermo-oxidative ageing-resistant nylon/acrylonitrile-butadiene-styrene resin mixed material has the characteristics of excellent thermo-oxidative ageing resistance and high flowability, has a high notch impact property, chemical resistance and mechanical properties, can be used as manufacturing materials of shells of automobile accessories, electric tools, office equipment and the like.
Patent•
07 Nov 2012
TL;DR: In this article, a spraying-free high-transparent high-glossy acrylonitrile butadiene styrene (ABS) alloy material and a preparation method thereof are presented.
Abstract: The invention discloses a spraying-free high-transparent high-glossy acrylonitrile butadiene styrene (ABS) alloy material and a preparation method thereof. The ABS alloy material comprises, by weight, 30-45% of polymethyl methacrylate (PMMA), 30-45% of acrylonitrile styrene (AS), 10-30% of flexibilizer, 1-5% of compatilizer, 0.3% of antioxidant and 0.7-2% of lubricant. The material has good transparency and high impact strength, modulus, surface glossy and surface scraping resistance, retains good processability and toughness of the ABS alloy material, and simultaneously has the advantages of good weather resistance, surface hardness, chemical resistance and glossy and the like of the PMMA and AS resin. The spraying-free high-transparent high-glossy ABS alloy material and the preparation method expand an application range of the ABS material in transparent materials. The preparation method includes the following steps: mixing raw materials according to the ratio, adding mixed resin into a plastic extruding machine, controlling the temperature to be 190-225 DEG C and granulating to obtain the spraying-free high glossy transparent ABS alloy material.
Patent•
05 Jan 2012
TL;DR: In this paper, an acryl acrylate resin with a (meth)acryloyl group on the side chain of an acrylic resin (P) having a weight-average molecular weight (Mw) of 150,000 min was produced by first producing, by suspension polymerization, the acrylic resin having an average molecular weight of 150k min.
Abstract: Provided is a production method for a curable resin with little viscosity after volatilization of a solvent, low volume shrinkage during curing, and excellent surface hardness, abrasion resistance, wear resistance, flexibility, heat resistance, mechanical strength, adhesion to substrates, adhesive strength, initial adhesiveness, chemical resistance, water resistance, and weather resistance An acryl acrylate resin having a (meth)acryloyl group on the side chain thereof is produced by introducing a (meth)acryloyl group to the side chain of an acrylic resin (P) having a weight-average molecular weight (Mw) of 150,000 min The acryl acrylate resin with a (meth)acryloyl group on the side chain thereof is produced by first producing, by suspension polymerization, the acrylic resin having a weight-average molecular weight (Mw) of 150,000 min, and then introducing a (meth)acryloyl group to the side chain of the acrylic resin (P)
Patent•
05 Dec 2012
TL;DR: In this article, a thermoplastic polyurethane (TPU) and polyvinyl chloride (PVC) blended rolling film and a preparation method thereof was revealed, which comprises following steps of step 1: respectively weighing raw materials such as a PVC film raw material and a TPU raw material.
Abstract: The invention discloses a thermoplastic polyurethane (TPU) and polyvinyl chloride (PVC) blended rolling film and a preparation method thereof The method comprises following steps of step 1: respectively weighing raw materials such as a PVC film raw material and a TPU raw material, wherein the weight ratio of the TPU and PVC is 1: 15 to 25; step 2: blending and plasticizing: blending the raw materials and plasticizing the raw materials through a roller machine; and step 3: forming a film through the processing of a forming device The hardness of the TPU and PVC blended rolling film which is prepared by the method falls in between 39P and 60P, so that not only is the good physical performance such as tensile strength, tearing strength and the like of the TPU reserved, but also good coldness resistance and good chemical resistance are achieved; and moreover, due to the adoption of the PVC, the cost is greatly reduced
Patent•
19 Sep 2012
TL;DR: In this article, a formula of heat-resistant ABS (acrylonitrile-butadiene-styrene), which comprises ABS 121H, an antioxidant, a toughener, a heat resisting agent and an assistant, was revealed.
Abstract: The invention discloses a formula of heat-resistant ABS (acrylonitrile-butadiene-styrene), which comprises ABS 121H, an antioxidant, a toughener, a heat resisting agent and an assistant, wherein the antioxidant is thiodipropionate, the toughener is polysulfide rubber, the heat resisting agent is polyimide, and the assistant is chlorinated polyethylene The heat-resistant ABS is prepared from the following components in percentage by weight: 645-66% of ABS 121H, 02-03% of thiodipropionate, 9-10% of polysulfide rubber, 247-25% of polyimide and 01-02% of chlorinated polyethylene The heat-resistant ABS has the advantages of shock resistance, favorable mechanical properties, higher toughness, high heat resistance and high chemical resistance
Patent•
13 Jun 2012
TL;DR: In this article, a PC/PMMA alloy has been used as housings of communication devices with higher surface hardness and used for packaging foods with higher requirements on the surface luster, which can adjust the transmittance of the PC and PMMA and the surface pearlescent color according to the needs.
Abstract: The invention relates to a PC/PMMA alloy and a preparation method thereof. The PC/PMMA alloy comprises the following components by weight percent: 75-82% of PC, 10-15% of PMMA, 4-10% of toughener, 3-5% of compatibilizer and 1-2% of antioxidant. The PC/PMMA alloy has the advantages of good mold filling flowability, excellent processing performance, high impact resistance, chemical resistance, highhardness and difficult scratching, and can adjust the transmittance of the PC/PMMA and the surface pearlescent color according to the needs, and be used as housings of communication devices with higher surface hardness and used for packaging foods with higher requirements on the surface luster.
Patent•
23 Feb 2012
TL;DR: In this article, the authors proposed an aromatic polycarbonate (APC) resin resin composition with high surface hardness, high scratch resistance, and chemical resistance, which was obtained by molding the same resin.
Abstract: PROBLEM TO BE SOLVED: To provide an aromatic polycarbonate resin composition being excellent in transparency and impact resistance, having high surface hardness, being good in scratch resistance, and being excellent in chemical resistance; and to provide a molded product obtained by molding the same.SOLUTION: The composition includes: 100 pts.mass of the total of resin components composed of 40 to 95 mass% of an aromatic polycarbonate resin (A) having a mass-average molecular weight of 15,000 to 40,000, and 5 to 60 mass% of a (meth)acrylate copolymer (B) containing an aromatic (meth)acrylate unit (b1) and a methyl methacrylate unit (b2) in a mass% ratio (b1/b2) of 5 to 80/20 to 95 and having a mass-average molecular weight of 5,000 to 30,000; 0.001 to 1 pt.mass of a phosphorus-based stabilizer (C); and 0.05 to 2 pts.mass of a saturated aliphatic hydrocarbon (D) having a number-average molecular weight of 200 to 1,000.
Patent•
31 May 2012
TL;DR: In this paper, a perfluoropolyether gel composition is used, in which the blending amount of a non-functional linear perfluoro compound (E) acting as a plasticizer is controlled within a specified range of 5 pts.mass or more and less than 20 pp.mass to 100 pts.
Abstract: PROBLEM TO BE SOLVED: To provide a method for further improving acid resistance of a perfluoropolyether gel cured product excellent in heat resistance, solvent resistance, chemical resistance, weatherability, mold releasability, water repellency, oil repellency, etc., without impairing these characteristics of the perfluoropolyether gel cured product.SOLUTION: A perfluoropolyether gel composition is used, in which the blending amount of a non-functional linear perfluoro compound (E) acting as a plasticizer is controlled within a specified range of 5 pts.mass or more and less than 20 pts.mass to 100 pts.mass total of a mixture of a linear perfluoropolyether compound (A) containing two or more alkenyl groups and a linear perfluoropolyether compound (B) having one alkenyl group in a molecule, which is a main agent (base polymer) of the composition.
Patent•
26 Sep 2012
TL;DR: In this article, flame resistant molding compositions comprising polycarbonates and graft polymers have been proposed for thin-walled housing parts in the electrical and electronics sector, with a UL94V-0 classification at 1.5 mm.
Abstract: The present invention relates to flame resistant moulding compositions comprising polycarbonates and graft polymers which, in addition to good flow properties, exhibit good (notched) impact strength and high chemical resistance with a UL94V-0 classification at 1.5 mm. These moulding compositions are particularly suitable for thin-walled housing parts in the electrical and electronics sector.
Patent•
13 Mar 2012
TL;DR: In this article, a transparent resin composition for forming an insulation film is proposed, which is excellent in adhesiveness to an adhesion resisting base material such as an ITO film or the like without impairing properties such as transparency, insulation, bending resistance, coating hardness, and chemical resistance.
Abstract: PROBLEM TO BE SOLVED: To provide a transparent resin composition for forming an insulation film, excellent in adhesiveness to an adhesion resisting base material such as an ITO film or the like without impairing characteristics such as transparency, insulation, bending resistance, coating hardness, and chemical resistance or the like.SOLUTION: A transparent resin composition for forming an insulation film contains (A) urethane (meta) acrylate, (B) bisphenol A type epoxy (meta) acrylate and (C) a reactive diluent containing a carboxy group and (D) a reactive diluent containing one (meta) acrylate and one or more of aromatic ring group, and/or alicyclic group in one molecule, and (E) a photopolymerization initiator. An acid value is 4.0-20 mgKOH/g.
Patent•
27 Feb 2012TL;DR: In this paper, an addition reaction-curable organopolysilmethylenesiloxane copolymer composition including an organopoly-siloxane and a platinum group metal-based catalyst was presented.
Abstract: Disclosed is an addition reaction-curable organopolysilmethylenesiloxane copolymer composition including: (A) an organopolysilmethylenesiloxane copolymer represented by formula (a) shown below: which has in one molecule at least two alkenyl groups bonding to silicon atoms; (B) an organopolysiloxane represented by formula (b) shown below: R 2 a SiO (4-a)/2 (b)
which has in one molecule at least two alkenyl groups bonding to silicon atoms; (C) an organohydrogenpolysilmethylenesiloxane and/or organohydrogenpolysiloxane; and (D) a platinum group metal-based catalyst. The copolymer composition excels in heat resistance, electrical insulation, mechanical strength, and optical properties, and exhibits good water resistance, hydrolysis resistance and gas barrier properties under severe use conditions without suffering gas permeability and poor chemical resistance inherent in silicone rubber.