# US 10,246,559 B2 · Method for preparing silicone resins containing hydroxy groups and alkoxy groups

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- Number: US 10,246,559 B2
- Document ID: US10246559B2
- Status: Granted
- Kind: B2
- Application number: 15/566,742
- Filed: 2016-10-11
- Published: 2018-03-29
- Granted: 2019-04-02
- Earliest claimed: 2016-02-29
- Assignees: Wacker Chemie AG
- Applicants: Wacker Chemie AG
- Inventors: Sabine Hoffmann
- Web page: https://patentgrep.com/patent/US10246559B2

## CPC

- C08G 77/16: to hydroxy groups
- C08G 77/06: Preparatory processes
- C08G 77/18: to alkoxy or aryloxy groups
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

The chlorohydrocarbon content of silicone resins prepared from alkoxysilanes is reduced by reacting alkoxysilane and 0.01-1 pbw chlorinated hydrocarbons with water at at least 50° C. and for at least 30 minutes, in the absence of a water immiscible solvent.

## Claims

### Claim 1

A process for preparing silicone resins bearing hydroxy groups and alkoxy groups, comprising:
reacting at a temperature of at least 50° C. and for at least 30 minutes,
a) 100 parts by weight of alkoxysilane,
b) from 0.01 to 1 parts by weight of hydrocarbon containing, based on alkoxysilane, from 10 to 2000 ppm by weight of Cl, and
c) water
without the addition of organic solvent(s) which at 0.1 MPa and 20° C. are soluble to a maximum extent of 1% by weight in water.

### Claim 2 (depends on 1)

The process of claim 1, wherein the alkoxysilane is initially charged into a reactor.

### Claim 3 (depends on 2)

The process of claim 2, further comprising separating alcohol formed in the reaction by distillation after the reaction.

### Claim 4 (depends on 3)

The process of claim 3, wherein an alkoxysilane has the formula (1),
RaSi(OR1)4-a (1),
where
R is an unsubstituted or Cl-substituted C1-18-hydrocarbon radical,
R1is an unsubstituted or Cl-substituted C1-6-alkyl radical and
a is 1, 2 or 3.

### Claim 5 (depends on 3)

The process of claim 3, wherein the silicone resins contain from 0.01 to 2% by weight of hydroxy groups.

### Claim 6 (depends on 2)

The process of claim 2, wherein an alkoxysilane has the formula (1),
RaSi(OR1)4-a (1),
where
R is an unsubstituted or Cl-substituted C1-18-hydrocarbon radical,
R1 is an unsubstituted or Cl-substituted C1-6-alkyl radical and
a is 1, 2 or 3.

### Claim 7 (depends on 2)

The process of claim 2, wherein the silicone resins contain from 0.01 to 2% by weight of hydroxy groups.

### Claim 8 (depends on 2)

The process of claim 2, wherein the silicone resins have from 1 to 50% by weight of alkoxy groups.

### Claim 9 (depends on 1)

The process of claim 1, further comprising separating alcohol formed in the reaction by distillation after the reaction.

### Claim 10 (depends on 9)

The process of claim 9, wherein an alkoxysilane has the formula (1),
RaSi(OR1)4-a (1),
where
R is an unsubstituted or Cl-substituted C1-18-hydrocarbon radical,
R1 is an unsubstituted or Cl-substituted C1-6-alkyl radical and
a is 1, 2 or 3.

### Claim 11 (depends on 9)

The process of claim 9, wherein the silicone resins contain from 0.01 to 2% by weight of hydroxy groups.

### Claim 12 (depends on 9)

The process of claim 9, wherein the silicone resins have from 1 to 50% by weight of alkoxy groups.

### Claim 13 (depends on 1)

The process of claim 1, wherein an alkoxysilane has the formula (1),
RaSi(OR1)4-a (1),
where
R is an unsubstituted or Cl-substituted C1-18-hydrocarbon radical,
R1 is an unsubstituted or Cl-substituted C1-6-alkyl radical and
a is 1, 2 or 3.

### Claim 14 (depends on 13)

The process of claim 13, wherein the silicone resins contain from 0.01 to 2% by weight of hydroxy groups.

### Claim 15 (depends on 13)

The process of claim 13, wherein the silicone resins have from 1 to 50% by weight of alkoxy groups.

### Claim 16 (depends on 1)

The process of claim 1, wherein the silicone resins contain from 0.01 to 2% by weight of hydroxy groups.

### Claim 17 (depends on 16)

The process of claim 16, wherein the silicone resins have from 1 to 50% by weight of alkoxy groups.

### Claim 18 (depends on 1)

The process of claim 1, wherein the silicone resins have from 1 to 50% by weight of alkoxy groups.