Patent US4256841A successfully refreshed from Google Patents.
US4256841A
Expired / Lapsed
US
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Manufacture of light-stable polyurethane integral foams
Assignee: BASF SE
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Filing: 1979-05-14
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Granted: 1981-03-17
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Expires: 1999-05-14
Abstract
Abstract To prepare light-stable polyurethane integral skin foams, especially soft integral foams, aliphatic and/or cycloaliphatic polyisocyanates, both categories preferably containing urethane groups and/or biuret groups, are reacted with polyols in the presence of blowing agents and of a synergistic catalyst combination comprising an alkali metal hydroxide, alkali metal alcoholate, alkali metal phenolate, alkali metal salt of a weak acid and/or hexahydrotriazine derivative and an organic tin, zinc and/or iron(II) compound, in the presence or absence of assistants and adjuvants. The preferred catalyst combination is tri-(dimethylaminopropyl)-s-hexahydrotriazine and dibutyl-tin dilaurate.
Inventors
- 👤 Heinrich Horacek
- 👤 Ernst Schoen
- 👤 Erhardt Reich
- 👤 Otto Volkert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/08; C08G18/16; C08G18/161; C08G18/163; C08G18/22; C08G18/73; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7831; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8012; C08G18/8016; C08G2110/00; C08G2110/0033; C08G2410/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
A process for the manufacture of light-stable polyurethane integral skin foams by reacting a mixture of organic polyisocyanates, polyols, catalysts and blowing agents, with or without assistants and adjuvants, wherein the organic polyisocyanates used are selected from the group consisting of aliphatic polyisocyanates, cycloaliphatic polyisocyanates, modified aliphatic polyisocyanates, modified cycloaliphatic polyisocyanates and mixtures thereof and the catalysts used are synergistic catalyst combinations comprising (A) a strongly basic polyisocyanurate catalyst selected from the group consisting of alkali metal hydroxides, alkali metal alcoholates, alkali metal phenolates, alkali metal salts of weak acids, 1,3,5-tris-(N,N-dialkylaminoalkyl)-s-hexahydrotriazines and mixtures thereof and (B) dibutyl-tin dilaurate.
Claim 2
Dependent Claim
98 words
A process for the manufacture of light-stable polyurethane integral skin foams by reacting a mixture of organic polyisocyanates, polyols, catalysts and blowing agents, with or without assistants and adjuvants, wherein the organic polyisocyanates used are selected from the group consisting of aliphatic polyisocyanates, cycloaliphatic polyisocyanates, modified aliphatic polyisocyanates, modified cycloaliphatic polyisocyanates and mixtures thereof and the catalysts used are synergistic catalyst combinations comprising (A) a strongly basic polyisocyanurate catalyst selected from the group consisting of alkali metal hydroxides, alkali metal alcoholates, alkali metal phenolates, alkali metal salts of weak acids, 1,3,5-tris-(N,N-dialkylaminoalkyl)-s-hexahydrotriazines and mixtures thereof and (B) dibutyl-tin dilaurate.
Claim 3
Dependent Claim
58 words
The process of claim 1 wherein the catalyst combination consists of (A) from 0.01 to 5 parts by weight of an alkali metal hydroxide, alkali metal alcoholate, alkali metal phenolate, alkali metal salt of a weak acid and/or 1,3,5-tris-(N,N-dialkylaminoalkyl)-s-hexahydrotriazine and (B) from 0.01 to 5 parts by weight of dibutyl-tin dilaurate, per 100 parts by weight of polyol.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein the organic polyisocyanate used is a urethane-modified aliphatic and/or cycloaliphatic polyisocyanate containing NCO groups.
Claim 5
Dependent Claim
38 words
The process of claim 3, wherein the urethane-modified polyisocyanate is prepared by reacting an aliphatic and/or cycloaliphatic diisocyanate and an alkanediol of 2 to 10 carbon atoms in the alkylene radical, in the molar ratio of about 2:1.
Claim 6
Dependent Claim
19 words
The process of claim 1, wherein the organic polyisocyanate used is an aliphatic and/or cycloaliphatic polyisocyanate containing biuret groups.
Claim 7
Dependent Claim
15 words
The process of claim 1, wherein the catalyst combination consists of tris-(dimethylaminopropyl)-s-hexahydrotriazine and dibutyl-tin dilaurate.
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |