Patent US5318997A successfully refreshed from Google Patents.
US5318997A
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US
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Method for production of open cell rigid polyurethane foam
Assignee: Mitsui Chemicals Polyurethanes Inc
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Filing: 1993-04-20
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Granted: 1994-06-07
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Expires: 2013-04-20
Abstract
Abstract A method of producing an open cell rigid polyurethane foam which comprises reacting a mixture of polyols having a hydroxyl value of 160-360 mg KOH/g with a polyisocyanate in the presence of water as a blowing agent in an amount of 6-12 parts by weight in relation to 100 parts by weight of the mixture of polyols at an isocyanate index of 70-120, the mixture of polyols comprising: (a) 30-60% by weight of a first polyoxyalkylene polyol having a functionality of 2-3.5, a hydroxyl value of 28-90 mg KOH/g, a polyoxyethylene unit content of not more than 5% by weight, and a primary hydroxyl group content of not more than 15% based on the total of the hydroxyl groups of the first polyoxyalkylene polyol; (b) 30-60% by weight of a second polyoxyalkylene polyol having a functionality of 3-6, a hydroxyl value of 150-500 mg KOH/g, and a primary hydroxyl group content of not more than 5% based on the total of the hydroxyl groups of the second polyoxyalkylene polyol; and (c) 0-25% by weight of a third polyol having a functionality of 2-3, a hydroxyl value of 450-840 mg KOH/g, and a primary hydroxyl group content of not more than 5% based on the total of the hydroxyl groups of the third polyol.
Inventors
- 👤 Kazuo Okada
- 👤 Yoshihiko Tairaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:22
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; C08G18/40; C08G18/48; C08G18/4804; C08G18/4816; C08G18/482; C08G18/6674; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2110/0083
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
213 words
A method of producing an open cell rigid polyurethane foam which comprises reacting a mixture of polyols having a hydroxyl value of 160-360 mg KOH/g with a polyisocyanate in the presence of water as a blowing agent in an amount of 6-12 parts by weight in relation to 100 parts by weight of the mixture of polyols at an isocyanate index of 70-120, the mixture of polyols comprising: (a) 30-60% by weight of a first polyoxyalkylene polyol having a functionality of 2-3.5, a hydroxyl value of 28-90 mg KOH/g, a polyoxyethylene unit content of not more than 5% by weight, and a primary hydroxyl group content of not more than 15% based on the total of the hydroxyl groups of the first polyoxyalkylene polyol; (b) 30-60% by weight of a second polyoxyalkylene polyol having a functionality of 3-6, a hydroxyl value of 150-500 mg KOH/g, and a primary hydroxyl group content of not more than 5% based on the total of the hydroxyl groups of the second polyoxyalkylene polyol; and (c) 0-25% by weight of a third polyol having a functionality of 2-3, a hydroxyl value of 450-840 mg KOH/g, and a primary hydroxyl group content of not more than 5% based on the total of the hydroxyl groups of the third polyol.
Claim 2
Independent Claim
213 words
A method of producing an open cell rigid polyurethane foam which comprises reacting a mixture of polyols having a hydroxyl value of 160-360 mg KOH/g with a polyisocyanate in the presence of water as a blowing agent in an amount of 6-12 parts by weight in relation to 100 parts by weight of the mixture of polyols at an isocyanate index of 70-120, the mixture of polyols comprising: (a) 30-60% by weight of a first polyoxyalkylene polyol having a functionality of 2-3.5, a hydroxyl value of 28-90 mg KOH/g, a polyoxyethylene unit content of not more than 5% by weight, and a primary hydroxyl group content of not more than 15% based on the total of the hydroxyl groups of the first polyoxyalkylene polyol; (b) 30-60% by weight of a second polyoxyalkylene polyol having a functionality of 3-6, a hydroxyl value of 150-500 mg KOH/g, and a primary hydroxyl group content of not more than 5% based on the total of the hydroxyl groups of the second polyoxyalkylene polyol; and (c) 0-25% by weight of a third polyol having a functionality of 2-3, a hydroxyl value of 450-840 mg KOH/g, and a primary hydroxyl group content of not more than 5% based on the total of the hydroxyl groups of the third polyol.
Claim 3
Dependent Claim
25 words
The method as claimed in claim 1 wherein the polyol (a) is an addition product of propylene oxide to a polyhydric alcohol as an initiator.
Claim 4
Dependent Claim
29 words
The method as claimed in claim 1 wherein the polyol (b) is an addition product of propylene oxide to an aliphatic amine or an aromatic amine as an initiator.
Claim 5
Dependent Claim
17 words
The method as claimed in claim 1 wherein the polyol (C) is dipropylene glycol or tripropylene glycol.
Claim 6
Dependent Claim
20 words
The method as claimed in claim 1 wherein each of the polyols (a), (b) and (c) is a polyoxypropylene polyol.
Claim 7
Dependent Claim
29 words
The method as claimed in claim 1 wherein the polyisocyanate is polymethylene polyphenyl polyisocyanate having a viscosity of not more than 200 centipoises at the temperature of 25° C.
Claim 8
Dependent Claim
20 words
The method as claimed in claim 1 wherein the mixture of polyols has a hydroxyl value of 250-350 mg KOH/g.
Claim 9
Dependent Claim
23 words
The method as claimed in claim 1 wherein the mixture of polyols is reacted with a polyisocyanate at an isocyanate index of 80-100.
Claim 10
Dependent Claim
35 words
The method as claimed in claim 1 wherein water is used as a blowing agent in an amount of 7-10 parts by weight in relation to 100 parts by weight of the mixture of polyols.
Claim 11
Dependent Claim
20 words
The method as claimed in claim 1 wherein the polyol (a) is an addition product of propylene oxide to glycerine.
Claim 12
Dependent Claim
25 words
The method as claimed in claim 1 wherein the polyol (a) is an addition product of propylene oxide to a mixture of glycerine and methylglucoside.
Claim 13
Dependent Claim
32 words
The method as claimed in claim 1 wherein the polyol (b) is an addition product of propylene oxide to at least one of an ethylene(poly)amine, an aliphatic amine and an aromatic amine.
Claim 14
Dependent Claim
25 words
The method as claimed in claim 1 wherein the polyol (b) is an addition product of propylene oxide to a mixture of sorbitol and glycerine.
Claim 15
Dependent Claim
23 words
The method as claimed in claim 1 wherein the mixture of polyols contains the polyol (a) in an amount of 35-55% by weight.
Claim 16
Dependent Claim
23 words
The method as claimed in claim 1 wherein the mixture of polyols contains the polyol (b) in an amount of 40-55% by weight.
Claim 17
Dependent Claim
23 words
The method as claimed in claim 1 wherein the mixture of polyols contains the polyol (c) in an amount of 0-20% by weight.
Claim 18
Dependent Claim
24 words
The method as claimed in claim 1 wherein when a free foam is produced, the foam has a density of 18-35 kg/m 3 .
Claim 19
Dependent Claim
27 words
The method as claimed in claim 1 wherein when a mold foam or spray foam is produced, the foam has a density of 22-50 kg/m 3 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-06 | 1997-12-06 | 1998-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-06 | 2001-12-06 | 2002-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-06 | 2005-12-06 | 2006-06-07 | $7700.00 | Window Closed / Lapsed |