A thermally conductive resin composition capable of maintaining high thermal conductivity and a thermally conductive sheet using the same. A thermally conductive resin composition contains: an addition reaction type silicone resin; a hindered phenol-based antioxidant; a thiol-based antioxidant; a dispersant having a hydrophilic functional group and a silicone chain; and a thermally conductive filler, wherein the thermally conductive resin composition contains 65 to 90% by volume of the thermally conductive filler.

The invention relates to a bi-functionalized polysiloxane brush copolymer comprising at least one hydroxyl-terminated polyalkyleneglycol side chain and at least one onium-functionalized side chain as defined herein, and a method for preparing the bi-functionalized polysiloxane brush copolymer, a curable composition comprising the bi-functionalized polysiloxane brush copolymer and its use.

The invention relates to a bi-functionalized polysiloxane brush copolymer comprising at least one hydroxyl-terminated polyalkyleneglycol side chain and at least one onium-functionalized side chain as defined herein, and a method for preparing the bi-functionalized polysiloxane brush copolymer, a curable composition comprising the bi-functionalized polysiloxane brush copolymer and its use.

A defoaming composition is composed of a composition E composed of a hydrogen bond donor polyether modified polysiloxane C and a hydrogen bond acceptor X, and a composition F composed of a hydrogen bond donor fatty alcohol polyether D and a hydrogen bond acceptor Y; and the polyether modified polysiloxane C is composed of a polyorganosiloxane A and an allyl polyether B. The general structural formula of the polyorganosiloxane A is R.sup.0.sub.2HSiO (Me.sub.2SiO).sub.aSiHR.sup.0.sub.2, where R.sup.0 is C1-12 alkyl, cycloalkyl or aryl, and a=10-100. The general structural formula of the allyl polyether B is CH.sub.2═CHCH.sub.2(OCH.sub.2CH.sub.2).sub.b(OCH.sub.2CHCH.sub.3).sub.cOH, where b=1-10, and c=10-100. The general structural formula of the fatty alcohol polyether D is R.sup.1(OCH.sub.2CH.sub.2).sub.m(OCH.sub.2CHCH.sub.3).sub.nOH, where R.sup.1 is C3-20 linear or branched alkyl, cycloalkyl or aralkyl; m=1-50; and n=10-100. The hydrogen bond acceptors X and Y are menthol, menthene, thymol, terpilenol, carveol or perillyl alcohol.

A fluorosilicone surfactant, and a preparation method and a use thereof are provided. The preparation method of the fluorosilicone surfactant includes: mixing alkynol or a derivative thereof, an allylpolyether, and an alkenyl fluorine-containing monomer with hydrogen-containing silicone oil to allow a hydrosilylation reaction, where a structural formula of the hydrogen-containing silicone oil includes at least three Si—H bonds. The fluorosilicone surfactant prepared by the present disclosure has both excellent wettability and low-foaming performance.

A fluorosilicone surfactant, and a preparation method and a use thereof are provided. The preparation method of the fluorosilicone surfactant includes: mixing alkynol or a derivative thereof, an allylpolyether, and an alkenyl fluorine-containing monomer with hydrogen-containing silicone oil to allow a hydrosilylation reaction, where a structural formula of the hydrogen-containing silicone oil includes at least three Si—H bonds. The fluorosilicone surfactant prepared by the present disclosure has both excellent wettability and low-foaming performance.

A curable composition contains (A) a perfluoro(poly)ether group-containing silane compound having two or more Si atoms bonded to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group, (B) a compound (other than (A)) having at least two OR.sup.2 groups bonded to an Si atom (in the formula, R.sup.2 each independently are a hydrogen atom or a monovalent organic group at each occurrence) or a partial hydrolysis condensate thereof, (C) a condensation catalyst, and (D) surface-treated silica.

A curable composition contains (A) a perfluoro(poly)ether group-containing silane compound having two or more Si atoms bonded to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group, (B) a compound (other than (A)) having at least two OR.sup.2 groups bonded to an Si atom (in the formula, R.sup.2 each independently are a hydrogen atom or a monovalent organic group at each occurrence) or a partial hydrolysis condensate thereof, (C) a condensation catalyst, and (D) surface-treated silica.

A curable composition includes: (A) a perfluoro(poly)ether group-containing silane compound having two or more Si atoms bonded to at least one group selected from the group consisting of a hydroxyl group and hydrolyzable groups; (B) a compound having at least two OR.sup.2 groups (in the formula, R.sup.2 is independently a hydrogen atom or a monovalent organic group at each occurrence) bonded to an Si atom (provided that (A) and (D) are excluded) or a partially hydrolyzed condensate thereof; (C) a condensation catalyst; and (D) a compound containing two or more alkoxysilyl groups in one molecule or a partially hydrolyzed condensate thereof (provided that (A) is excluded), with the linking group between the alkoxysilyl groups being a group other than that selected from the group consisting of an —O— group and a group having a siloxane bond.

A curable composition includes: (A) a perfluoro(poly)ether group-containing silane compound having two or more Si atoms bonded to at least one group selected from the group consisting of a hydroxyl group and hydrolyzable groups; (B) a compound having at least two OR.sup.2 groups (in the formula, R.sup.2 is independently a hydrogen atom or a monovalent organic group at each occurrence) bonded to an Si atom (provided that (A) and (D) are excluded) or a partially hydrolyzed condensate thereof; (C) a condensation catalyst; and (D) a compound containing two or more alkoxysilyl groups in one molecule or a partially hydrolyzed condensate thereof (provided that (A) is excluded), with the linking group between the alkoxysilyl groups being a group other than that selected from the group consisting of an —O— group and a group having a siloxane bond.