Silicon polymer emulsions

• US 20030040572A1
• Filed: 08/05/2002
• Published: 02/27/2003
• Est. Priority Date: 02/11/2000
• Status: Active Grant

• Current Assignee: Dow, Inc.
• Original Assignee: Dow, Inc.
• Inventors: Marteaux, Leon Andre, Girboux, Anne-Lise
• Granted Patent: US 6,878,773 B2
• Time in Patent Office: Days
• US Class Current: 524/837
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• CPC Class Codes: C08G 77/44 containing only polysiloxane sequences
• CPC Class Codes: C08G 77/442 containing vinyl polymer sequences
• CPC Class Codes: C08G 77/50 by carbon linkages C08G77/485 takes precedence
• CPC Class Codes: C08J 2383/04 Polysiloxanes
• CPC Class Codes: C08J 3/03 in aqueous media
• CPC Class Codes: C08K 5/01 Hydrocarbons C08K5/0091 takes precedence
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 83/04 Polysiloxanes

Abstract

In a process for the preparation of an emulsion of a silicone organic block copolymer in water, a polydiorganosiloxane having terminal reactive groups (A), an organic material having terminal groups (B) which are reactive with the groups (A) and a catalyst are emulsified in water with a surfactant and the resulting emulsion is subjected to conditions under which the reaction between groups (A) and (B) proceeds in the presence of the catalyst, thereby forming a copolymer chain containing polysiloxane blocks and blocks of organic material. Preferred emulsions comprise a copolymer comprising polydiorganosiloxane blocks and organic blocks, having a viscosity in the range 10 to 1000000 Pa.s and a mean particle size of 0.3 to 1000 micrometers.

Claims

1. A process for the preparation of an emulsion of a silicone organic block copolymer in water, characterised in that a polydiorganosiloxane having terminal Si—

H groups (A), an organic material having terminal aliphatically unsaturated groups (B) which are reactive with the Si—

H groups (A) and a catalyst are emulsified in water with a surfactant to form an emulsion and the resulting emulsion is subjected to conditions under which the reaction between groups (A) and (B) proceeds in the presence of the catalyst, thereby forming a copolymer chain containing polysiloxane blocks and blocks of organic material.

2. A process according to claim 1, characterized in that the organic material is an alpha, omega-diene having 6 to 30 carbon atoms.

3. A process according to claim 1 or claim 2, characterised in that the catalyst is a Pt^IV compound.

4. A process according to any of claims 1 to 3, characterized in that the polydiorganosiloxane and the organic material are emulsified in water with a nonionic surfactant t and the catalyst is added to the the emulsion.

5. A process according to any of claims 1 to 3, characterised in that the polydiorganosiloxane and the organic material are emulsified in water with an anionic, cationic or amphoteric surfactant and the catalyst is dispersed in a nonionic surfactant before being added to the the emulsion.

7. A process according to any of claims 1 to 6, characterised in that the organic material is a polymer having a backbone of carbon-carbon bonds.

8. A process according to claim 7, wherein the polymer is polyisobutylene.

10. An emulsion of a silicone organic block copolymer in water prepared by the process of any of claims 1 to 8.

6. A process for the preparation of an emulsion of a silicone organic block copolymer in water, characterised in that a polydiorganosiloxane having terminal reactive groups (A), an organic material having terminal groups (B) which are reactive with the groups (A) and a catalyst are mixed and then emulsified in water with a surfactant to and the resulting is subjected to conditions under which the reaction between groups (A) and (B) proceeds in the presence of the catalyst, thereby forming a copolymer chain containing polysiloxane blocks and blocks of organic material.

9. An emulsion of a silicone organic copolymer in water, characterised in that the copolymer comprises polydiorganosiloxane blocks and organic blocks and has a viscosity in the range 10 to 1000000 Pa.s and a mean particle size of 0.3 to 1000 micrometers.