# US 8,785,511 B2 · Silicone-containing polyurethane foam

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,785,511 B2
- Document ID: US8785511B2
- Status: Granted
- Kind: B2
- Application number: 13/991,335
- Filed: 2011-12-05
- Published: 2013-09-26
- Granted: 2014-07-22
- Earliest claimed: 2010-12-06
- Assignees: Wacker Chemie AG
- Applicants: Jens Cremer; Steffen Jungermann
- Inventors: Jens Cremer; Steffen Jungermann
- Web page: https://patentgrep.com/patent/US8785511B2

## CPC

- C08G 77/16: to hydroxy groups
- C08G 18/10: Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G 18/61: Polysiloxanes
- C08G 18/7621: {being toluene diisocyanate including isomer mixtures}
- C08G 18/765: {alpha, alpha, alpha', alpha', -tetraalkylxylylene diisocyanate or homologues substituted on the aromatic ring}
- C08G 2110/0083: prepared using water as the sole blowing agent
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

Low density silicone-containing polyurethane foams with excellent surface characteristics are prepared by reacting a foamable composition containing a siloxane of the formula and an isocyanate, in the presence of at least one blowing agent.

## Claims

### Claim 1

A foamable composition, comprising
(A) at least one siloxane of the formula
where
R in each occurrence is the same or different and is hydrogen or a monovalent, optionally substituted hydrocarbon radical,
R1 in each occurrence is the same or different and is a divalent, optionally substituted hydrocarbon radical optionally interrupted by heteroatoms,
R2 in each occurrence is the same or different and is a divalent, optionally substituted hydrocarbon radical optionally interrupted by heteroatoms,
R3 in each occurrence is the same or different and is hydrogen or a monovalent, optionally substituted hydrocarbon radical,
X in each occurrence is the same or different and is —O—, —S— or —NR4—,
R4 is hydrogen or a monovalent, optionally substituted hydrocarbon radical,
n is the same or different and is an integer not less than 1, and
m is an integer not less than 1,
with the proviso that at least one R3 radical in formula (I) is an optionally substituted hydrocarbon radical having at least one hydroxyl group and/or thiol group, and
(B) a polyisocyanate.

### Claim 2 (depends on 1)

The foamable composition of claim 1, wherein X is —O—.

### Claim 3 (depends on 1)

The foamable composition of claim 1, wherein one R3 is a hydroxyalkyl radical having from 1 to 6 carbon atoms.

### Claim 4 (depends on 2)

The foamable composition of claim 2, wherein one R3 is a hydroxyalkyl radical having from 1 to 6 carbon atoms.

### Claim 5 (depends on 1)

The foamable composition of claim 1, wherein in formula (I) both the R3 radicals are hydrocarbon radicals having a hydroxyl group.

### Claim 6 (depends on 2)

The foamable composition of claim 2, wherein in formula (I) both the R3 radicals are hydrocarbon radicals having a hydroxyl group.

### Claim 7 (depends on 5)

The foamable composition of claim 5, wherein in formula (I) both the R3 radicals are hydroxyalkyl radicals having from 1 to 6 carbon atoms.

### Claim 8 (depends on 1)

The foamable composition of claim 1, further comprising at least one further component C) through H):
(C) fillers,
(D) emulsifiers,
(E) physical blowing agents,
(F) catalysts,
(G) chemical blowing agents, and
(H) additives,
with the proviso that the foamable composition contains at least one blowing agent (E) and/or (G).

### Claim 9 (depends on 8)

A process for producing a foamable composition of claim 8, comprising preparing a 2-part system wherein the two parts of the 2-part system contain all constituents in any desired combinations and mixing ratios, with the proviso that one part does not simultaneously contain siloxanes (A) and polyisocyanates (B) and/or the constituents (B) and (G).

### Claim 10 (depends on 1)

A process for preparing a silicone-containing polyurethane foam, comprising adding at least one blowing agent to the foamable composition of claim 1 and allowing the composition to react to generate a silicone-containing polyurethane foam.

### Claim 11 (depends on 1)

A silicon-containing polyurethane foam obtained by reacting a foamable composition of claim 1, the foamable composition further comprising
(C) optionally filler(s),
(D) optionally emulsifier(s),
(E) optionally physical blowing agent(s),
(F) optionally catalyst(s),
(G) optionally chemical blowing agent(s), and
(H) optionally further additives different from (A) through (G),
wherein at least one blowing agent components (E) and/or (G) is present, and with the proviso that no further constituents other than (A) through (H) are present.