# US 9,751,987 B2 · Catalyst for synthesis of siloxanes

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- Number: US 9,751,987 B2
- Document ID: US9751987B2
- Status: Granted
- Kind: B2
- Application number: 14/913,789
- Filed: 2014-08-18
- Published: 2016-12-08
- Granted: 2017-09-05
- Earliest claimed: 2013-08-23
- Assignees: Momentive Performance Materials Inc.
- Applicants: Momentive Performance Materials Inc.
- Inventors: Karthikeyan Sivasubramanian; Patricia Pike Anderson; Vivek Khare
- Web page: https://patentgrep.com/patent/US9751987B2

## CPC

- C08G 77/08: characterised by the catalysts used
- C08G 77/04: Polysiloxanes
- B01J 31/0224: {being perfluorinated, i.e. comprising at least one perfluorinated moiety as substructure in case of polyfunctional compounds}
- B01J 2231/14: Other (co) polymerisation, e.g. of lactides or epoxides
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

The process of claim 1, wherein the N-trialkylsilyl-bis(perfluoroalkylsulfonyl)imide is of the formula:
where R1 and R2 are independently chosen from a perfluoroalkyl radical; and R3, R4, and R5 are independently chosen from, a linear or branched alkyl a linear or branched alkyl optionally comprising one or more heteroatoms.

### Claim 3 (depends on 2)

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

### Claim 4 (depends on 2)

The process of claim 2, wherein the perfluoroalkyl radical is chosen from —CF3, —C2F5, —C3F7, —C4F9, —C5F11, —C6F13, —C7F15, —C8F17 or a combination of two or more thereof.

### Claim 5 (depends on 2, 3, 4)

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.

### Claim 6 (depends on 2)

The process of claim 2, wherein R1 and R2 are each —CF3, and R3-R5 are each CH3.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

The process of claim 1, wherein the cyclosiloxane is of the formula (R6R7SiO)n, wherein R6 and R7 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.

### Claim 10 (depends on 1)

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.

### Claim 11 (depends on 1)

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

### Claim 12 (depends on 1)

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

### Claim 13 (depends on 12)

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.

### Claim 14 (depends on 1)

The process of claim 1 further comprising deactivating the catalyst.

### Claim 15 (depends on 14)

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.

### Claim 16 (depends on 14)

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

### Claim 17 (depends on 1)

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