Patent US4305991A successfully refreshed from Google Patents.
US4305991A
Expired / Lapsed
US
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Integral-skin polyurethane foams and process therefor
Assignee: Bayer AG
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Filing: 1980-03-31
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Granted: 1981-12-15
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Expires: 2000-03-31
Abstract
Abstract The instant invention relates to a process for the production of polyurethane foams by reacting polyisocyanates with polyhydroxyl compounds of a specified molecular weight range in the presence of blowing agents and chain lengthening or cross-linking agents and optionally in the presence of catalysts, foam stabilizers and other additives generally known. The improvement resides in (a) the polyisocyanates used containing aliphatically and/or cycloaliphatically bound isocyanate groups; (b) the polyhydroxyl compounds used containing ether groups; and (c) the chain lengthening or cross-linking agents comprising at least in part a member selected from the group consisting of a monoalkoxylated hydrazine, a dialkoxylated hydrazine, a reaction product of a monoalkoxylated or dialkoxylated hydrazine with an aliphatic monoisocyanate in a molar ratio of 1:1. The reaction is carried out in the presence of additional chain lengthening agents having a specified molecular weight. The present invention also relates to polyurethane foams obtained by this process.
Inventors
- 👤 Holger Meyborg
- 👤 Werner Mormann
- 👤 Hans-Walter Illger
- 👤 Manfred Bock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:53
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3831; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; Y; Y10; Y10S; Y10S264/00; Y10S264/14; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989; Y10T428/31504; Y10T428/31551; Y10T428/31554
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A process for the production of integral skin polyurethane foams in closed molds, comprising reacting (a) polyisocyanates; (b) hydroxyl compounds having a molecular weight of from 400 to 10,000; (c) chain lengthening agents; and (d) blowing agents; the improvement wherein (i) said polyisocyanate contains aliphatically and/or cycloaliphatically bound isocyanate groups; (ii) said polyhydroxyl compounds contain ether groups; and (iii) said component (c) comprises a compound selected from the group consisting of monoalkoxylated hydrazine, dialkoxylated hydrazine, reaction products of mono- and/or dialkoxylated hydrazine with aliphatic monoisocyanates in a molar ratio of 1:1, and mixtures thereof.
Claim 2
Dependent Claim
94 words
A process for the production of integral skin polyurethane foams in closed molds, comprising reacting (a) polyisocyanates; (b) hydroxyl compounds having a molecular weight of from 400 to 10,000; (c) chain lengthening agents; and (d) blowing agents; the improvement wherein (i) said polyisocyanate contains aliphatically and/or cycloaliphatically bound isocyanate groups; (ii) said polyhydroxyl compounds contain ether groups; and (iii) said component (c) comprises a compound selected from the group consisting of monoalkoxylated hydrazine, dialkoxylated hydrazine, reaction products of mono- and/or dialkoxylated hydrazine with aliphatic monoisocyanates in a molar ratio of 1:1, and mixtures thereof.
Claim 3
Dependent Claim
28 words
A process as claimed in claim 1, wherein component (c), in part, is composed of known chain lengthening agents having a molecular weight of from 32 to 400.
Claim 4
Dependent Claim
12 words
A process as claimed in claim 1, wherein component (c) is hydrazinoethanol.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 1, wherein component (c) is a reaction product of a C 1 -C 8 alkyl monoisocyanate and hydrazinoethanol in said molar ratio of 1:1.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 1, wherein component (c) is a reaction product of ethyl, isopropyl and/or n-butylisocyanate and hydrozinoethanol in said molar ratio of 1:1.
Claim 7
Dependent Claim
34 words
A process as claimed in claims 1 or 2 or 3 or 4, wherein said component (c) is used in a quantity of from 0.1 to 10% by weight, based on said polyhydroxyl compounds.
Claim 8
Dependent Claim
25 words
A process as claimed in claim 1, wherein said components (a) are 1-isocyanato-3,3,5,5-triethyl-5-isocyanatomethyl cyclohexane; 4,4'-dicyclohexyl methane diisocyanate and/or a tolylene diisocyanate hydrogenated in the nucleus.
Claim 9
Dependent Claim
38 words
A process as claimed in claims 1 or 7, wherein said component (a) is a liquid reaction product of organic polyhydroxyl compounds containing excess quantities of 1-isocyanato-3,3,5,5-trimethyl-5-isocyanatomethylcyclohexane; 4,4'-dicyclohexyl methane diisocyanate and/or a tolylene diisocyanate hydrogenated in the nucleus.
Claim 10
Dependent Claim
27 words
A process as claimed in claim 1, wherein said reaction is carried out in the presence of organic compounds containing amidine groups or imidazole groups as catalysts.
Claim 11
Dependent Claim
10 words
A polyurethane foam produced by the process of claim 1.
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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) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |