Catalyst for synthesis of siloxanes

Patent metadata

Field	Value
Publication number	US-9751987-B2
Application number	US-201414913789-A
Country	US
Kind code	B2
Filing date	Aug 18, 2014
Priority date	Aug 23, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

The present technology provides compositions, methods, and processes to form polysiloxanes. In one aspect, the present technology provides a process for the ring opening polymerization of a cyclosiloxane comprising contacting a cyclosiloxane with a N-trialkylsilyl-bis(perfluoroalkylsulfonyl)imide compound.

First claim

What is claimed is:

1. A process for the ring opening polymerization of a cyclosiloxane comprising contacting a cyclosiloxane and a silanol terminated siloxane with a N-trialkylsilyl-bis(perfluoroalkylsulfonyl)imide compound.

2. The process of claim 1 , wherein the N-trialkylsilyl-bis(perfluoroalkylsulfonyl)imide is of the formula:

where R 1 and R 2 are independently chosen from a perfluoroalkyl radical; and R 3 , R 4 , and R 5 are independently chosen from, a linear or branched alkyl a linear or branched alkyl optionally comprising one or more heteroatoms.

3. The process of claim 2 , wherein the perfluoroalkyl radical is a linear or branched perfluoroalkyl radical having 1-10 carbon atoms.

4. The process of claim 2 , wherein the perfluoroalkyl radical is chosen from —CF 3 , —C 2 F 5 , —C 3 F 7 , —C 4 F 9 , —C 5 F 11 , —C 6 F 13 , —C 7 F 15 , —C 8 F 17 or a combination of two or more thereof.

5. The process of any one of claim 2 - 4 , wherein the alkyl group is chosen from a linear or branched alkyl having 1-10 carbon atoms.

6. The process of claim 2 , wherein R 1 and R 2 are each —CF 3 , and R 3 -R 5 are each CH 3 .

7. The process of claim 1 , wherein the N-trialkylsilyl-bis(perfluoroalkylsulfonyl)imide is present in an amount of from about 0.025 weight percent to about 5 weight percent based on the total weight of the cyclosiloxane.

8. The process of claim 1 , wherein the N-trialkylsilyl-bis(perfluoroalkylsulfonyl)imide is present in an amount of from about 0.1 weight percent to about 0.4 weight percent based on the total weight of the cyclosiloxane.

9. The process of claim 1 , wherein the cyclosiloxane is of the formula (R 6 R 7 SiO) n , wherein R 6 and R 7 are independently chosen from hydrogen or an optionally substituted alkyl, alkenyl, aryl, alkaryl or aralkyl group having up to 8 carbon atoms, and n denotes an integer with a value of from 3 to 12.

10. The process of claim 1 , wherein the cyclosiloxane is chosen from octamethyl cyclotetrasiloxane (D4), hexamethylcyclotrisiloxane (D3), octaphenylcyclotetrasiloxane, tetramethylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane, hexamethyl-1,1-diphenylcyclotetrasiloxane, decamethyl pentacyclosiloxane, cyclopenta (methylvinyl) siloxane, cyclotetra(phenylmethyl) siloxane, cyclopenta methylhydrosiloxane, or a combination of two or more thereof.

11. The process of claim 1 comprising two or more cyclosiloxanes, where at least two cyclosiloxanes have a different ring size from each other.

12. The process of claim 1 , wherein the reaction comprises an endblocker material.

13. The process of claim 12 , wherein the endblocker material is chosen from hexamethyl di siloxane; octamethyltrisiloxane; decamethyltetrasiloxane; dodecamethylpentasiloxane; tetradecamethylhexasiloxane; hexadecamethylheptasiloxane, hydride substituted siloxane or a combination of two or more thereof.

14. The process of claim 1 further comprising deactivating the catalyst.

15. The process of claim 14 , wherein deactivating the catalyst comprises: treating the product with a material to neutralize the catalyst such as a base or a basic resin, or a combination of two or more thereof.

16. The process of claim 14 further comprising filtering the reaction mixture.

17. The process of claim 1 , wherein the silanol terminated siloxane is silanol terminated poly(dimethylsiloxane).

Assignees

• Momentive Performance Mat Inc

Inventors

• Sivasubramanian Karthikeyan
• Anderson Patricia Pike
• Khare Vivek

Classifications

• C08G77/08 Primary

  characterised by the catalysts used · CPC title

• C08G77/04

  Polysiloxanes · CPC title

• B01J2231/14

  Other (co) polymerisation, e.g. of lactides or epoxides · CPC title

• B01J31/0224

  being perfluorinated, i.e. comprising at least one perfluorinated moiety as substructure in case of polyfunctional compounds · CPC title