Abstract: A silicone particle containing: a dialkylsiloxane unit represented by the following general formula (1), R42SiO2/2 (1), where, in the formula (1), R4s each independently represent a monovalent hydrocarbon group having 1 to 6 carbon atoms; and a poly(alkyleneoxyalkyl)methylsiloxane unit represented by the following general formula (2), where, in the formula (2), R1s each independently represent a hydrogen atom or a monovalent hydrocarbon group having 1 to 6 carbon atoms, R2s each independently represent a divalent aliphatic group having 1 to 6 carbon atoms, and “n” is a number that satisfies 1?n?20, where the silicone particle has an oxyalkylene group in a surface thereof. A silicone particle may be readily dispersed in an aqueous material without the use of a dispersant or a surfactant, the silicone particle having a hydrophilic group.

Abstract: A hydrophilic silicone particle containing a surfactant fixed by a chemical bond formed by radical polymerization to a surface of a silicone particle having a volume average particle size of 0.1 to 100 ?m and a method for producing the hydrophilic silicone particle, the method including fixing a hydrophilic group derived from a component (B) to a surface of a silicone particle by subjecting an emulsion to radical polymerization, the emulsion containing: (A) 100 parts by mass of an organopolysiloxane having a radical polymerization reactive group; (B) 0.5 to 50 parts by mass of a surfactant having a radical polymerization reactive group; (C) 0.1 to 5 parts by mass of a radical generator; and (D) 10 to 1000 parts by mass of water. A silicone particle may be readily dispersed in an aqueous material without the additional use of a dispersant (typically, a surfactant) and has a hydrophilic group.

Abstract: An oil-in-water emulsion composition which contains components (A), (B) and (C). (A) 30-70% by mass of a silicone resin composition which is a mixture that is obtained by mixing component (A-1) and component (A-2) at a specific mass ratio, and which has a viscosity of from 100 mm2/s to 4,000 mm2/s at 25° C. (A-1) a silicone resin which has an (R3SiO0.5) unit and an (SiO2) unit at a specific molar ratio (A-2) a volatile oil (B) 2-10% by mass of a polyoxyethylene sorbitan fatty acid ester which has an average number of moles of added ethylene oxide (EO) of 10 or more and an HLB of 11 or more (C) 20-62% by mass of water.

Abstract: The present invention is a water repellent composition containing (A) a component that is a condensation reaction product between: (a) an organopolysiloxane shown by the following general formula (1) and having a hydroxyl group or an alkoxy group at both terminals of a molecular chain of the organopolysiloxane, (R2O)R12SiO—(R12SiO)m—SiR12 (OR2) (1); and (b) a trialkylsiloxysilicate containing an R13SiO1/2 unit, an SiO2 unit, and a siloxane unit having a hydroxyl group bonded to a silicon atom, where a molar ratio of the R13SiO1/2 unit/the SiO2 unit is 0.6 to 1.3, and a content of the hydroxyl group is 0.1 or more and less than 2.0 mass %. This provides a water repellent composition which is effectively used as a water repellent excellent in water repellency, particularly suitably applied as an agent for paintwork and a glass surface of an automobile, so as to impart favorable initial water repellency and long-lasting water repellency.

Abstract: This waterproof sheet made of a silicone rubber is characterized by being provided with: a base material layer obtained by curing a silicone rubber composition; and a pressure-sensitive adhesive layer comprising a cured product of a silicone gel composition laminated on one surface of the base material layer, wherein, on the other surface of the base material layer, a coating layer containing a silicone resin represented by average composition formula (1): [RSiO3/2]m[R2SiO]n (in the formula, each R represents an identical or a different monovalent hydrocarbon group that is unsubstituted or substituted and that contains 1-20 carbon atoms, m is 0.45-1.0, n is 0-0.55, and m+n?1.0 is satisfied) is included.

Abstract: An oil compound used for defoaming includes (A) a substantially hydrophobic organopolysiloxane having a viscosity of 10 to 100,000 mm2/second at 25° C., and (B) finely divided silica that has undergone surface hydrophobization treatment, wherein when an insoluble matter is collected from the oil compound by using hexane and the spectra of the insoluble matter are measured by 29Si-CP/MAS-NMR, the peaks of the silica due to the SiO4/2 (Q) units on the silica surface are such that a ratio [(Q2+Q3)/Q4] between a total area (Q2+Q3) wherein Q2 is a peak area of a silicon atom having two unreacted silanol groups and Q3 is a peak area of a silicon atom having one unreacted silanol group and an area Q4 wherein Q4 is a peak area of a silicon atom having no unreacted silanol group is at 70/30 to 20/80.

Abstract: An oil compound used for defoaming includes (A) a substantially hydrophobic organopolysiloxane having a viscosity of 10 to 100,000 mm2/second at 25° C., and (B) finely divided silica that has undergone surface hydrophobization treatment, wherein when an insoluble matter is collected from the oil compound by using hexane and the spectra of the insoluble matter are measured by 29Si-CP/MAS-NMR, the peaks of the silica due to the SiO4/2 (Q) units on the silica surface are such that a ratio [(Q2+Q3)/Q4] between a total area (Q2+Q3) wherein Q2 is a peak area of a silicon atom having two unreacted silanol groups and Q3 is a peak area of a silicon atom having one unreacted silanol group and an area Q4 wherein Q4 is a peak area of a silicon atom having no unreacted silanol group is at 70/30 to 20/80.

Abstract: The present invention relates to a perfluoropolyether-modified polysiloxane represented by general formula (1): wherein Rf is a linear or branched perfluoroalkyl group having 1 to 10 carbon atoms; X is a fluorine atom or a trifluoromethyl group; Q is a divalent organic group having 1 to 12 carbon atoms; R1, R2, and R3 are, independently of each other, an alkyl group having 1 to 10 carbon atoms or an aryl group; a, b, c, and d are, independently of each other, an integer of from 0 to 200, provided that a total of a, b, c and d is 1 or larger; e is an integer of 0 or 1; and z is an integer of from 5 to 100; a method for preparing the same; and a defoaming agent comprising the same.

Abstract: The present invention relates to a perfluoropolyether-modified polysiloxane represented by general formula (1): wherein Rf is a linear or branched perfluoroalkyl group having 1 to 10 carbon atoms; X is a fluorine atom or a trifluoromethyl group; Q is a divalent organic group having 1 to 12 carbon atoms; R1, R2, and R3 are, independently of each other, an alkyl group having 1 to 10 carbon atoms or an aryl group; a, b, c, and d are, independently of each other, an integer of from 0 to 200, provided that a total of a, b, c and d is 1 or larger; e is an integer of 0 or 1; and z is an integer of from 5 to 100; a method for preparing the same; and a defoaming agent comprising the same.

Abstract: An oil compound is prepared by kneading (A) an essentially hydrophobic organopolysiloxane and (B) finely divided silica with (C) a minor amount of a silica surface treating agent and (D) water or with (E) aqueous ammonia, heat treating the resulting mixture, further kneading the mixture with (C) a major amount of the silica surface treating agent, and heat treating the resulting mixture. The oil compound is used to form a silicone-based antifoam composition having effective foam-breaking, persistent antifoaming ability and internal addition stability in foaming liquids.

Abstract: Provided is a low-foaming silicone composition, including: (A) from 51 to 99.9 parts by mass of a polyoxyalkylene-modified organopolysiloxane having a specific structure, (B) from 0.1 to 49 parts by mass of a polyoxyalkylene/perfluoroalkyl-comodified organopolysiloxane having a specific structure, and (C) from 0 to 48.9 parts by mass of a glycerol-modified organopolysiloxane having a specific structure (provided that the combined quantity of the component (A), the component (B) and the component (C) is 100 parts by mass). The silicone composition exhibits a powerful surfactant action and low foaming properties, and is useful as a spreading agent and a cleaning agent.

Abstract: Provided is a low-foaming silicone composition, including: (A) from 51 to 99.9 parts by mass of a polyoxyalkylene-modified organopolysiloxane having a specific structure, (B) from 0.1 to 49 parts by mass of a polyoxyalkylene/perfluoroalkyl-comodified organopolysiloxane having a specific structure, and (C) from 0 to 48.9 parts by mass of a glycerol-modified organopolysiloxane having a specific structure (provided that the combined quantity of the component (A), the component (B) and the component (C) is 100 parts by mass). The silicone composition exhibits a powerful surfactant action and low foaming properties, and is useful as a spreading agent and a cleaning agent.