Abstract: The present invention relates to a curable silicone composition comprising: (A) an organopolysiloxane represented by a specific average unit formula, (B) an optional straight-chain organopolysiloxane having at least two alkenyl groups and not having any silicon-bonded hydrogen atoms in a molecule, (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, and (D) a hydrosilylation reaction catalyst. The curable silicone composition has high reactivity and forms a cured product with low gas permeability.

Abstract: The present invention relates to a curable silicone composition comprising: (A) an organopolysiloxane represented by a specific average unit formula and having at least two alkenyl groups in a molecule, (B) an optional straight-chain organopolysiloxane having at least two alkenyl groups and not having any silicon-bonded hydrogen atoms in a molecule, (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, wherein at least 80 mass % of this component comprises an organotrisiloxane represented by the formula: H(CH3)2SiO(C6H5)2SiOSi(CH3)2H, and (D) a hydrosilylation reaction catalyst. The curable silicone composition has excellent handleability and high reactivity and forms a cured product with low gas permeability.

Abstract: Problem: To provide a novel copolymer capable of use as a surface treatment agent which is safe and does not generate hydrogen, which has good compatibility with other cosmetic raw materials so as to be able to improve compounding stability of a cosmetic, which contributes to good water resistance, sebum resistance, gloss, feel, hair attachment ability, skin attachment ability and the like of a cosmetic, which further may be used for treatment of powders of a wide range of cosmetics, and which nearly entirely suppresses the occurrence of dispersion failure on the skin. Resolution Means: A copolymer comprising: (A) an unsaturated monomer having a carbosiloxane dendrimer structure; and (B) an unsaturated monomer having at least one hydrophilic group in the molecule. A content of the unsaturated monomer having the carbosiloxane dendrimer structure is in the range of 35 to 50% by mass of the total monomer units of the copolymer.

Abstract: The present invention relates to a monoalkenyl-containing glycerin derivative with purity of not less than 92% and electrical conductivity of not greater than 50 ?S/cm. The monoalkenyl-containing glycerin derivative can be manufactured by a manufacturing method comprising a step (A): a step of reacting a ketalized glycerin derivative and a monoalkenyl glycidyl ether in the presence of an inorganic base to obtain a ketal of monoalkenyl-containing glycerin derivative; a step (B): a step of purifying the ketal of monoalkenyl-containing glycerin derivative obtained in the step (A) by distillation; and a step (C): a step of hydrolyzing the ketal of monoalkenyl-containing glycerin derivative obtained in the step (B). The present invention is able to provide a high-purity monoalkenyl-containing glycerin derivative that was difficult in the past.

Abstract: A curable organopolysiloxane composition that can achieve excellent initial adhesion improvement effects towards various types of substrates, and a protective agent or adhesive composition for electric and electronic components, are provided. The curable organopolysiloxane composition comprises (A) either i) (a1) an organopolysiloxane having a specific alkoxysilyl-containing group and at least an average of 0.5 alkenyl groups, or ii) a mixture of (a1) and (a2) an organopolysiloxane that has at least two alkenyl groups in a molecule, and that does not have the aforementioned group having an alkoxysilyl group. In the mixture, the amount of component (a1) is 10 to less than 100 mass %. The curable organopolysiloxane composition further comprises (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in each molecule, (C) a catalyst for a hydrosilylation reaction, and (D) a catalyst for a condensation reaction.

Abstract: An anti-foaming agent containing (A) an organopolysiloxane and a finely powdered inorganic filler, (B) a polyoxyalkylene group-containing branched chain organopolysiloxane, and (C) an anionic surfactant. This anti-foaming agent exhibits stable anti-foaming performance even at high temperatures that reach, for example, 80QC or under strongly alkaline conditions and produces no aggregates.

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: The present invention relates to a curable silicone composition comprising: (A) an organopolysiloxane having at least two alkenyl groups and at least one aryl group in a molecule, (B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms in a molecule, (C) an organopolysiloxane having at least one aryl group in a molecule and containing a metal atom selected from the group consisting of V, Ta, Nb and Ce, and (D) a hydrosilylation-reaction catalyst. The present invention can provide the curable silicone composition, which does not develop a crack by thermal aging and further can form a cured material that exhibits less yellowing.

Abstract: A curable silicone composition comprising: (A) an organopolysiloxane represented by the average unit formula: (R13SiO1/2)a(R22SiO2/2)b(R3SiO3/2)c (R1 are alkyl groups, alkenyl groups, aryl groups, or aralkyl groups; R2 are alkyl groups or alkenyl groups; R3 is an alkyl group, aryl group, or an aralkyl group, provided that, in a molecule, at least 0.5 mol % of R1 to R3 are the alkenyl groups, at least one of R3 is the aryl group or the aralkyl group; and a, b, and c are numbers satisfying: 0.01?a?0.5, 0.4?b?0.8, 0.01?c?0.5, and a+b+c=1); (B) an organopolysiloxane that is different from component (A); (C) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms in a molecule; and (D) a hydrosilylation reaction catalyst. A cured product exhibiting excellent dispersibility of phosphor and having high strength and gas barrier properties is formed.

Abstract: The present invention relates to a glycerin derivative-modified organopolysiloxane elastomer comprising: as a hydrophilic group, a glycerin derivative group in which an average number of repetitions of glycerin units is in a range of 1.0 to 2.4, being free of an oxyalkylene structure having an average number of repetitions of an oxyalkylene unit of 2 or higher; and a crosslinked three-dimensional net-like structure having a carbon-silicon bond in a crosslinking part.

Abstract: Provided is a heat fixing apparatus, which suppresses the depletion of a lubricant applied to an inside of the heat fixing apparatus and which has long life and high reliability, the heat fixing apparatus including a heating rotary member and a pressurizing rotary member, and containing, as a lubricant in a sliding portion, (A) perfluoropolyether oil having a kinetic viscosity at 40° C. of from 100 to 200 mm2/s and an evaporation loss being 1.2 mass % or less in a case where 10 g of a sample of the perfluoropolyether oil is placed in a petri dish having an inner diameter of 41 mm and allowed to stand still at 250° C. for 200 hours and (B) polytetrafluoroethylene.

Abstract: In a process for separating a solid material from a suspension of the solid material in water, an organopolysiloxane polyalkylene oxide copolymer comprising a branched organopolysiloxane structure is added to the suspension of solid material in water and the suspension is drained. The organopolysiloxane polyalkylene oxide copolymer comprising a branched organopolysiloxane structure increases the rate of drainage of the suspension.

Abstract: A method to produce a hydrosilylation reaction-crosslinkable silicone rubber powder includes washing the hydrosilylation reaction-crosslinkable silicone rubber powder using an aqueous solution. The aqueous solution can be heated to a temperature of 30° C. to 99° C. The aqueous solution contains at least one type of surfactant. The hydrosilylation reaction-crosslinkable silicone rubber powder produced via the method has a platinum metal content ?3.5 ppm by mass. The hydrosilylation reaction-crosslinkable silicone rubber powder can be used for various applications, including use in a cosmetic composition, which can also include a cosmetic raw material.

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: This invention relates to a silicone material satisfying any of the following conditions in an elemental composition percentage of the silicone material surface according to X-ray photoelectron spectroscopy (ESCA): (i) the elemental composition percentage of carbon atoms is from 50.0 to 70.0 atom %; (ii) a ratio of the elemental composition percentage of carbon atoms to the elemental composition percentage of silicon atoms (C/Si) is from 2.0 to 5.0; or (iii) both of the above conditions (i) and (ii). The silicone material is stable against light and heat, in which a decrease in transmittance and generation of cracks do not tend to occur.

Abstract: A curable silicone composition comprising: (A) (A1) an organopolysiloxane having at least two alkenyl groups in a molecule and free of silicon-bonded hydroxyl groups or silicon-bonded hydrogen atoms, or a mixture of said component (A1) and (A2) a branched chain organopolysiloxane represented by an average unit formula; (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule; (C) a diorganodialkoxysilane represented by a general formula; (D) a straight chain organosiloxane oligomer having at least one silicon-bonded hydroxyl group in a molecule and free of silicon-bonded hydrogen atoms; and (E) a hydrosilylation catalyst, can form a cured product which exhibits excellent initial adhesive properties and transparency and exhibits excellent adhesive durability and retention of transparency under conditions of high temperature and high humidity.

Abstract: The present invention relates to a hot-meltable curable silicone composition for compression molding or laminating and a laminate provided with at least one layer comprising the composition, as well as a semiconductor device using these and a method of manufacturing the same. In accordance with the present invention, it is possible to efficiently manufacture a semiconductor device provided with a hemi-spheroidal lens- or dome-shaped seal. In the present invention, it is easy to control the shape of the seal, and the seal does not contain any bubbles. In the present invention, it is also easy to control the thickness of the coating layer of the semiconductor device apart from the seal.

Abstract: A phenol-modified polyorganosiloxane suitable as a modifier for an organic resin, in which a platinum metal content is reduced, and the yellowing is reduced, a method for preparing the same, and a modifier for an organic resin containing the same are provided. The phenol-modified polyorganosiloxane is a compound of formula (I), having a platinum metal content of 0.9 ppm or less. The phenol-modified polyorganosiloxane can be prepared by subjecting a phenol compound substituted with an alkenyl group of formula (IV) and a polyorganohydrogen siloxane of formula (V) to a hydrosilation reaction in the presence of a platinum-based catalyst applicable to a homogenous system, and subsequently, reducing the platinum metal content of the resulting product to 0.

Abstract: A co-modified organopolysiloxane represented by General Formula (1): R2R12SiO(R12SiO)nSiR12Q, and a surfactant/dispersing agent, emulsifier for a water-in-oil emulsion, external use preparation and cosmetic composition comprising the same. In the formula, the R1 groups are monovalent hydrocarbon group having 1 to 12 carbon atoms, R2 is a monovalent hydrocarbon group having 13 to 30 carbon atoms, and Q is a sugar alcohol group-containing organic group or a diglycerin derivative group having an average number of repetitions of a glycerin unit of 1.1 to 2.9, n is a number in a range of 0 to 100.

Abstract: The present invention provides a co-modified organopolysiloxane having a specified chemical structure in which a sugar alcohol-modified group and a silylalkyl group having a siloxane dendron structure, and optionally a long-chain hydrocarbon group are present. The co-modified organopolysiloxane is blended, as a surfactant, a powder treatment agent, a gelling agent or the like, or as a cosmetic raw material together with powder (s), oil agent (s) or the like, in a preparation for external use, and in particular, a cosmetic.