Patent US4833176A successfully refreshed from Google Patents.
US4833176A
Expired / Lapsed
US
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Process for the preparation of cold setting flexible polyurethane molded foams
Assignee: Bayer AG
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Filing: 1988-06-13
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Granted: 1989-05-23
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Expires: 2008-06-13
Abstract
Abstract The present invention is directed to a process for the preparation of cold setting, flexible, polyurethane, molded foams in a closed mold by reacting a polyisocyanate with a high molecular weight polyol in the presence of about 5 to 15, preferably about 6 to 12 parts by weight of water, based on the weight of the high molecular weight polyol at an isocyanate index below 70.
Inventors
- 👤 Klaus-Dieter Wolf
- 👤 Hans-Joachim Kogelnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4833; C08G18/4837; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7607; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0075; C08G2110/0083; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
A process for the preparation of a cold setting, flexible polyurethane molded foam which comprises reacting inside a closed mold at an isocyanate index below 70 (a) a polyisocyanate comprising diphenylmethane diisocyanate and/or toluylene diisocyanate, said polyisocyanate containing up to about 25%, based on the total weight of polyisocyanate, of hexamethylene diisocyanate and/or of isophorone diisocyanate with (b) a compound having a molecular weight of 400 to about 10,000 and containing at least two isocyanate reactive groups in the presence of (d) about 5 to 15 parts by weight of water, based on 100 parts of component (b) and (c) optionally a chain lengthening and/or cross-linking agent having a molecular weight of 32 to 399 and containing at least two isocyanate reactive groups.
Claim 2
Dependent Claim
123 words
A process for the preparation of a cold setting, flexible polyurethane molded foam which comprises reacting inside a closed mold at an isocyanate index below 70 (a) a polyisocyanate comprising diphenylmethane diisocyanate and/or toluylene diisocyanate, said polyisocyanate containing up to about 25%, based on the total weight of polyisocyanate, of hexamethylene diisocyanate and/or of isophorone diisocyanate with (b) a compound having a molecular weight of 400 to about 10,000 and containing at least two isocyanate reactive groups in the presence of (d) about 5 to 15 parts by weight of water, based on 100 parts of component (b) and (c) optionally a chain lengthening and/or cross-linking agent having a molecular weight of 32 to 399 and containing at least two isocyanate reactive groups.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein water (d) is used in a quantity of about 6 to 12 parts by weight, based on 100 parts by weight of component (b).
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said reaction is conducted at an isocyanate index of about 40 to 60.
Claim 5
Dependent Claim
19 words
The process of claim 2 wherein said reaction is conducted at an isocyanate index of about 40 to 60.
References Cited (Backward Citations)
GB892776A
Cited
GB1133691A
Cited
US3706678A
Cited
US4248930A
Cited
US4263408A
Cited
DE2948289A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |