Dow Toray Co., Ltd.

Takeshi Yoshizawa

Kazuhiko Kojima

Mari Wakita

Tsunehito Sugiura

Hiroko Taniguchi

Ikutaro Morikawa

Yasue Kanzaki

Provided is a silicone anti-foaming agent composition that not only has superior anti-foaming speed but also in which anti-foaming performance is not reduced even when used repeatedly or over a long period. The composition comprises: a polyorganosiloxane polymer crosslinked product having a polyoxyalkylene group, which includes: moiety structure (I): -R-(RSiO)-R(where Rrepresents an alkylene group bonded to a silicon atom on the polysiloxane chain, Rrepresents a monovalent hydrocarbon group, and d is 200 to 1000); and moiety structure (II): —(CH)—O—(EO)-(PO)-(BO)-R(where a single bond on the left end is bonded to a silicon atom on the polysiloxane chain, Rrepresents a hydrogen atom, an alkyl group, an aryl group or an acyl group, e is 2 to 10, (x+y+z) is 40 to 100, x is 15 to 50, y is 15 to 50, and z is 0 to 50).

Silicone-based defoamer composition

Provided is a silicone resin-coated silicone elastomer particle that is superior in dispersibility into organic resins, in stress relaxation performance, and the like, and that has low dust scattering when mixing and thus is superior in ease of handling. Also provided is an organic resin additive, an organic resin, a coating composition, or a coating agent composition, and applications such as in cosmetic compositions, including the particle. The silicone resin-coated silicone elastomer particle has a structure wherein at least two silicon atoms in a silicone elastomer particle are cross-linked through a silalkylene group with a carbon number between 4 and 20 where some or all of the surface thereof is coated with a silicone resin structured from siloxane units expressed by SiO.

Silicone resin-covered silicone elastomer particles, organic resin additive, and other uses

Provided is a silicone based anti-foaming agent oil compound that has not only superior anti-foaming speed but also anti-foaming performance that does not degrade with repeated use or use over a long period. The silicone based anti-foaming agent oil compound comprises: (A) an essentially hydrophobic organopolysiloxane with a viscosity at 25° C. of 2,500 to 50,000 mPa·s: 20 to 80 parts by mass; (B) a hydrophobic organopolysiloxane or cyclic organopolysiloxane having silanol groups at least at both terminals: 20 to 80 parts by mass; (C) a silane or silane condensation product: 1 to 10 parts by mass; and (D) a fine powder silica with a specific surface area of 50 m/g or more: 2 to 10 parts by mass; where the total amount of (A) and (B) combined is 100 parts by mass. Also provided is a method for manufacturing the silicone based anti-foaming agent oil compound.

Oil compound for silicone-based defoaming agents, method for producing same, and defoaming agent containing oil compound for silicone-based defoaming agents

Provided is a silicone resin coated silicone elastomer particle which can be easily produced on an industrial scale, has superior dispersibility and oil absorptivity in a curable organic resin such as an epoxy resin, and has superior workability due to low secondary aggregation compared to conventional silicone elastomer particles. Also provided are applications containing the particles such as organic resin additives, organic resins, coating compositions or coating agent compositions, and cosmetic compositions. The silicone resin coated silicone elastomer particles have part or all of their surface coated with a silicone resin made up of two types of siloxane units. The siloxane units are selected from D units represented by RSiO, T units represented by RSiO, and Q units represented by SiO. The particles also have a structure in which at least two silicon atoms in the particles are cross-linked by a silalkylene group with 2 to 20 carbon atoms.

Growing community of inventors

Ichihara, Japan

Takeshi Yoshizawa