Abstract: Grease composition contains (A) a straight-chain perfluoropolyether having a kinematic viscosity of 2-110 mm2/s at 40° C., (B) a branched perfluoropolyether having a kinematic viscosity of 2-100 mm2/s at 40° C., and (C) a fluorocarbon resin powder having a primary particle size of 1 ?m or less, wherein the contained amount of the fluorocarbon resin powder is 25-40 wt % with respect to the weight of the grease composition, and the weight ratio of the straight-chain perfluoropolyether (A) to the branched perfluoropolyether (B) is 15:85 to 70:30.

Abstract: An optical member resin sheet has excellent characteristics as an optical member and exhibits excellent performance even if used for a light-emitting device or the like. The optical member resin sheet is characterized in that the difference between the thickness of an end of the sheet and the thickness of the center of the sheet in the width direction of the sheet is within 5.0% of the total film thickness of the sheet; in that the thickness of the center of the sheet is in the range of 10-1000 ?m; in that the sheet area is 225 mm2 or more; and by containing at least one fluorescent substance or reflective material.

Abstract: Provided is a laminate having, on a substrate, a gel layer which is excellent in heat resistance, has low elastic modulus, low stress and is excellent in stress buffering properties and flexibility, is soft and excellent in holding property of electronic components before curing, and after curing, the gel layer is changed to a hard cured layer which is higher in shape retention and excellent in mold releasability than before curing, and a method for manufacturing the same. Also provided is a method for manufacturing an electronic component in which use of the laminate makes it difficult to cause problems such as deposits of silicone gel or a cured product thereof to a substrate or an electronic component, and makes it difficult to cause problems of defects or defective products of the electronic component. The laminate includes a curing reactive silicone gel layer on at least one type of substrate.

Abstract: A curable silicone composition for die bonding use contains at least (A) an organopolysiloxane having at least two alkenyl groups per molecule, (B) an organopolysiloxane having at least two siloxane units each represented by the formula: RHSiO (wherein R represents a monovalent hydrocarbon group having 1 to 12 carbon atoms and having no aliphatic unsaturated bond) per molecule, (C) a platinum-group metal-based catalyst for hydrosilylation reactions, (D) a hydrosilylation reaction inhibitor and (E) an adhesiveness-imparting agent, wherein the scorch time (ts1), which is defined in JIS K 6300-2, at a die bonding temperature is 20 to 60 seconds, and the 90% vulcanization time [tc(90)] with respect to the maximum torque value during the vulcanization time of 600 seconds is 300 to 500 seconds. The curable silicone composition for die bonding use according to the present invention can adhere a semiconductor chip to a support strongly.

Abstract: A silicone resin-linear co-polymer is disclosed. The silicone resin-linear copolymer includes a resinous structure having the general formula (1): (R1R2R3SiO1/2)x(R4SiO3/2)y ??(1) wherein each R1, R2, R3 and R4 is an independently selected substituted or unsubstituted hydrocarbyl group, with the proviso that in one molecular at least two of R1, R2, and R3 are aryl groups; and x and y are each from >0 to <1 such that x+y=1; and a linear structure having the general formula (2): (R5R6SiO2/2) ??(2) wherein R5 and R6 are each independently selected substituted or unsubstituted hydrocarbyl groups. End use applications and related methods of the silicone resin-linear copolymer are also disclosed.

Abstract: The first water repellent agent composition contains amino-modified silicone, a silicone resin, and a polyfunctional isocyanate compound. The second water repellent agent composition comprising dimethylpolysiloxane having a hydroxyl group and/or an alkoxy group having 1 to 3 carbon atoms, an amino group-containing silane coupling agent, a silicone resin, and a polyfunctional isocyanate compound.

Abstract: The present invention relates to a method for producing a transparent or semi-transparent liquid glycerin derivative-modified silicone composition that comprises a hydration step of adding water to a liquid glycerin derivative-modified silicone or composition thereof. The present invention can provide a liquid glycerin derivative-modified silicone composition having a transparent or semi-transparent appearance can be provided.

Abstract: A silicone resin-linear copolymer is disclosed which has a resinous structure (A1) including R1SiO3/2 units, and a linear structure (A2) including repeated R22SiO2/2 units, wherein R1 is a propyl group and each R2 is an independently selected substituted or unsubstituted hydrocarbyl group, and wherein the resinous structure (A1) and the linear structure (A2) are bonded together in the silicone resin-linear copolymer via a siloxane bond.

Abstract: The present invention relates to a curable silicone composition comprising: (A) a diorganopolysiloxane having at least two alkenyl groups in a molecule, (B) at least two types of resinous organopolysiloxanes having different mass average molecular weights, (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, and (D) a hydrosilylation reaction catalyst. The curable silicone composition enables the production of an optical semiconductor device in which the marked viscosity elevation of the resulting composition can be inhibited, in which the fluidity and packing properties are outstanding and that has outstanding gas barrier properties when used as a sealant, and in which the device has outstanding initial optical output efficiency even when organopolysiloxane resin is blended in order to form cured product with moderate hardness and strength.

Abstract: A treatment agent for a cosmetic powder is provided. The treatment agent contains a reactive organosiloxane represented by the following general formula (1) as a main ingredient: In general formula (1): each R1 is independently an alkyl group having 1 to 30 carbon atoms; each R2 is independently an alkyl group having 1 to 20 carbon atoms; R3 is a divalent alkylene group; n is an integer of 1 to 200; and p is an integer of 1 to 3. The treatment agent for a cosmetic powder of this disclosure is capable of imparting excellent lipophilicity. A cosmetic raw material having cosmetic effect and giving an excellent feeling of use, and a cosmetic are also provided.

Abstract: A coating composition for a lubricating coating film includes: (A) a phenolic resin; (B) an epoxy resin having an epoxy equivalent weight of 600 to 4000; and (C) at least one type of solid lubricant. The epoxy equivalent weight is generally defined by the number average molecular weight per the number of epoxy groups in a single molecule. The coating composition has a weight ratio of component (A) to the total weight of component (A) and component (B) of at least 50 weight %. A lubricating coating film, formed from the coating composition, has a high level of flexibility on surfaces of various base materials.

Abstract: Silicone particles having excellent dispersibility are provided. A cosmetic material having excellent feeling of use, and a highly functional paint and an electronic material are also provided. The silicone particles include a siloxane as a component. A content of a hydrogen atom bonded to a silicon atom per unit mass is 300 ppm or less. In addition, the silicon atom in the siloxane as a component for the silicone particles is crosslinked with another silicon atom via an alkylene group having a carbon number of 4 to 20.

Abstract: A silicone rubber composition for textile coating is disclosed. The silicone rubber composition comprises: (A) an organopolysiloxane having at least two alkenyl groups in a molecule and having a viscosity at 25° C. of from 100 to 1000000 mPa·s; (B) an organopolysiloxane represented by an average unit formula described herein; (C) a hydrosilylation catalyst; (D) a reinforcing silica fine powder; (E) an organotitanium compound and/or an organozirconium compound; and (F) an alkoxysilane having an epoxy group and/or an alkoxysilane having a methacryl group or an acryl group. The silicone rubber composition generally reduces formation and/or expansion of openings even when a large tension is applied to a textile coated with the silicone rubber composition. A silicone rubber-coated textile and method of formation are also disclosed.

Abstract: A curable silicone composition comprises: (A) an organopolysiloxane represented by a specific average unit formula; optionally, (B) an organopolysiloxane represented by a specific average unit formula; (C) an organohydrogenpolysiloxane represented by a specific average composition formula; and (D) a hydrosilylation catalyst. A curable hot-melt silicone is obtained by subjecting the curable silicone composition to a hydrosilylation reaction to a degree that does not form a cured product. The curable hot-melt silicone is non-flowable at 25° C. and has a melt viscosity at 100° C. of 5000 Pa·s or less. The curable silicone composition provides a cured product having excellent heat resistance and light resistance after being cured. The curable hot-melt silicone is non-flowable at room temperature, has low surface stickiness, and is readily melted by heating.

Abstract: A copolymer in which from 45 to 60% by mass of all monomer units are unsaturated monomers having a specific carbosiloxane dendrimer structure is disclosed, along with a composition, a cosmetic raw material, and a cosmetic containing the copolymer. The copolymer has excellent physical properties, including compatibility with other cosmetic raw materials, e.g. hardly soluble ultraviolet absorbers, and is capable of improving the compounding stability of cosmetics. The copolymer imparts cosmetics with good water resistance, sebum resistance, luster, tactile sensation, and adhesiveness to the hair or skin.

Abstract: A production method of a liquid high-purity polyhydric alcohol derivative-modified silicone or a composition thereof is disclosed. The method comprises: a capturing step 1) of bringing into an impurity-containing composition containing a liquid polyhydric alcohol derivative-modified silicone and hydrophilic impurities originating from a polyhydric alcohol derivative, the polyhydric alcohol derivative being a hydrophilic modifier of the polyhydric alcohol derivative-modified silicone, into contact with solid particles capable of capturing the hydrophilic impurities, and then capturing the hydrophilic impurities with the solid particles; and a separating step 2) of separating the polyhydric alcohol derivative-modified silicone and the solid particles. The method is useful for production of the liquid high-purity polyhydric alcohol derivative-modified silicone and the composition thereof on a commercial scale.

Abstract: A silicone gel composition for use in sealing or filling of electrical or electronic parts comprising at least one adhesion promoter (Z), and by curing to form a silicone gel having, at 25° C. and a shear frequency of 0.1 Hz, a loss elastic modulus of from 5.0×103 to 1.0×105 dyne/cm2, a complex elastic modulus of from 5.0×104 to 1.0×106 dyne/cm2, and a loss tangent of 0.3 or less. The silicone gel composition is provided, which can suppress the occurrence of air bubbles or cracks in silicone gel that seals or fills an electrical or electronic part and has excellent bonding to the electrical or electronic part even when used under high-temperature conditions as in a power device; and a silicone gel is provided, which can suppress the occurrence of air bubbles or cracks when it seals or fills an electrical or electronic part.

Abstract: Provided are a thermally conductive silicone composition excelling in heat resistance and thermal conductivity, in which thickening in an uncured state is suppressed, and which has excellent handling ease; and an electrical/electronic apparatus in which the thermally conductive silicone composition is used as a member. The thermally conductive silicone composition comprises (A) 100 parts by mass of either i) (a1) an organopolysiloxane having, in each molecule thereof, at least one alkoxysilyl-containing group bonded to a silicon atom and expressed by the general formula: and as generally described herein, or ii) a mixture of component (a1) and (a2) an organopolysiloxane having in each molecule thereof, at least two alkenyl groups but not the alkoxysilyl-containing group. In the mixture, the content of component (a1) is 10 to less than 100 mass %. The thermally conductive silicone composition further comprises (B) 400 to 3,500 parts by mass of a thermally conductive filler.

Abstract: A cosmetic material comprises (A) a hydrophobic powder; (B) a carboxylic acid modified silicone; (C) a basic compound; and (D) water. The (A) hydrophobic powder is generally dispersed in an aqueous phase of the cosmetic material. The cosmetic material can provide a refreshing sense of feel during use, and can form a cosmetic film with excellent water resistance on the skin.

Abstract: An organosilicon compound represented by the general formula, a hydrosilylation-curable silicone composition containing the compound as an adhesion promoter, and a semiconductor device having a semiconductor element sealed with a cured product of the composition. To provide a novel organosilicon compound, a curable silicone composition that contains the organosilicon compound as an adhesion promoter, has excellent initial adhesion and adhesion durability to a base material such as an organic resin, and forms a cured product having high light transmittance, and a highly reliable semiconductor device produced using this composition.