# US 5,344,906 A · Process for producing organosiloxanes

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- Number: US 5,344,906 A
- Document ID: US5344906A
- Status: Granted
- Kind: A
- Application number: 08/107,093
- Filed: 1993-08-16
- Granted: 1994-09-06
- Earliest claimed: 1992-09-05
- Assignees: Dow Corning Corporation
- Inventors: Stephen Westall
- Web page: https://patentgrep.com/patent/US5344906A

## CPC

- C08G 77/26: nitrogen-containing groups
- C08G 77/08: characterised by the catalysts used
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

Process for the production of condensation products or organosilicon compounds having at least one silicon-bonded hydroxyl group. The process comprises contacting the organosilicon compound with a quaternary ammonium borate, -phosphate, -carbonate or -silicate. May be employed for example for the polymerisation of .alpha., w silanol-terminated polydiorganosiloxanes and for the production of organosiloxanes having organofunctional e.g. aminoalkyl groups.

## Claims

### Claim 1

A process for the production of an organosilicon condensation product which comprises contacting (A) at least one organosilicon compound having in the molecule at least one silanol group, and silicon-bonded organic substituents wherein the silicon-bonded organic substituents are selected from monovalent hydrocarbon groups having from 1 to 14 carbon atoms or monovalent substituted hydrocarbon groups having from 1 to 10 carbon atoms in which the substituents of the monovalent substituted hydrocarbon groups are selected from amino, halogen, mercapto, hydroxyl, amido or ester, with (B) a quaternary ammonium compound selected from quaternary ammonium phosphates, quaternary ammonium borates, quaternary ammonium carbonates or quaternary ammonium silicates.

### Claim 2 (depends on 2)

A process as claimed in claim 2 wherein organosilicon compound (A) is a polydiorganosiloxane having a hydroxyl group attached to each terminal silicon atom.

### Claim 3 (depends on 1)

A process as claimed in claim 1 wherein organosilicon compound (A) has a silanol group at one terminal position in the molecule and a triorganosiloxy group at a second terminal position.

### Claim 4 (depends on 1)

A process as claimed in claim 1 wherein there is present with organosilicon compound (A) a silane having silicon-bonded alkoxy groups which are reactive with the silicon-bonded groups in (A) or the condensation product of (A).

### Claim 5 (depends on 4)

A process as claimed in claim 4 wherein the silane having silicon-bonded alkoxy groups also has a silicon-bonded alkyl group substituted with at least one amino group.

### Claim 6 (depends on 1)

A process as claimed in claim 1 wherein (B) is a quaternary ammonium borate.

### Claim 7 (depends on 1)

A process as claimed in claim 1 wherein any residual quaternary ammonium compound B is subsequently removed from the condensation product by thermal decomposition.