# US 2014/0193631 A1 · Polyurethane foam

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- Number: US 2014/0193631 A1
- Document ID: US20140193631A1
- Status: Published application
- Kind: A1
- Application number: 14/234,424
- Filed: 2012-07-23
- Published: 2014-07-10
- Earliest claimed: 2011-07-25
- Assignees: Rogers Inoac Corporation; Inoac Corporation
- Inventors: Seiji Oyaizu
- Web page: https://patentgrep.com/patent/US20140193631A1

## CPC

- C08G 18/4244: {containing oxygen in the form of ether groups}
- C08G 18/3206: {aliphatic}
- C08G 18/36: Hydroxylated esters of higher fatty acids
- C08G 18/4018: {Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48}
- C08G 18/44: Polycarbonates
- C08G 18/6629: {with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38}
- C08G 18/6696: {with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38}
- C08J 9/02: using blowing gases generated by the reacting monomers or modifying agents during the preparation or modification of macromolecules
- C08J 9/122: {Hydrogen, oxygen, CO2, nitrogen or noble gases}
- C08G 2110/0066: ≥ 150kg/m3
- C08J 2203/06: CO2, N2 or noble gases
- C08J 2205/044: Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
- C08J 2205/06: Flexible foams
- C08J 2375/04: Polyurethanes
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

The present invention relates to a polyurethane foam obtained from a polyurethane raw material containing polyol, isocyanate, a foam stabilizer, a catalyst and a foam-forming gas by a mechanical froth method, wherein the polyol contains a castor oil-based polyol having a viscosity at 25° C. of 2,000 mPa·s or less, and a polyether-based polyol, the castor oil-based polyol is contained in an amount of from 20 to 80 parts by weight per 100 parts by weight of the polyol, the polyether-based polyol is contained in an amount of from 20 to 80 parts by weight per 100 parts by weight of the polyol, the polyurethane foam has an apparent density of from 100 to 700 kg/m3, and compressive residual strain at 100° C. of 20% or less, and the polyurethane foam can be preferably used as a sealing material in a neighboring region of a heat source.

## Claims

### Claim 1

A polyurethane foam obtained from a polyurethane raw material containing polyol, isocyanate, a foam stabilizer, a catalyst and a foam-forming gas by a mechanical froth method,
wherein
the polyol contains a castor oil-based polyol having a viscosity at 25° C. of 2,000 mPa·s or less, and a polyether-based polyol,
the castor oil-based polyol is contained in an amount of from 20 to 80 parts by weight per 100 parts by weight of the polyol,
the polyether-based polyol is contained in an amount of from 20 to 80 parts by weight per 100 parts by weight of the polyol, and
the polyurethane foam has an apparent density of from 100 to 700 kg/m3, and compressive residual strain at 100° C. of 20% or less.

### Claim 2 (depends on 1)

The polyurethane foam according to claim 1,
wherein
the polyol contains the polyether-based polyol in which an ethylene oxide ratio that is a proportion of an oxyethylene unit in polyoxyalkylene is 50 mol % or more, in an amount of from 20 to 80 parts by weight per 100 parts by weight of the polyol, and
a total amount of the polyether-based polyol in which the ethylene oxide ratio is 50 mol % or more, and the castor oil-based polyol is from 50 to 100 parts by weight per 100 parts by weight of the polyol.

### Claim 3 (depends on 2)

The polyurethane foam according to claim 2,
wherein
the castor oil-based polyol is contained in an amount of from 40 to 70 parts by weight per 100 parts by weight of the polyol, and
the polyether-based polyol in which the ethylene oxide ratio is 50 mol % or more is contained in an amount of from 30 to 60 parts by weight per 100 parts by weight of the polyol.

### Claim 4 (depends on 1)

The polyurethane foam according to claim 1, which has a thickness of from 0.1 to 15 mm.

### Claim 5 (depends on 1)

The polyurethane foam according to claim 1, which has 25% compressive load of from 0.02 to 0.40 MPa.

### Claim 6 (depends on 1)

The polyurethane foam according to claim 1, which has an average cell diameter of from 50 to 300 μm.

### Claim 7 (depends on 1)

The polyurethane foam according to claim 1, which has compressive residual strain at 100° C. of 10% or less.

### Claim 8 (depends on 1)

The polyurethane foam according to claim 1, which has compressive residual strain at 110° C. of 10% or less.

### Claim 9 (depends on 1)

A sealing material, comprising:
the polyurethane foam according to claim 1.

### Claim 10 (depends on 1)

A buffer material, comprising:
the polyurethane foam according to claim 1.