US4581388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of urethane-modified polyisocyanate using an oxyalkylated bisphenol
Assignee: Bayer AG
•
Filing: 1985-01-07
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Granted: 1986-04-08
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Expires: 2005-01-07
Abstract
Abstract Urethane-modified polyisocyanates having an NCO-content of from 5 to 45 wt. % are made by reacting an organic polyisocyanate or mixture of polyisocyanates having an NCO-content of from 30 to 50 wt. % with an organic polyhydroxyl compound or mixtures of polyhydroxyl compounds. The organic polyhydroxyl compound must include at least 10 hydroxyl equivalent percent of an alkoxylation product of a bisphenol corresponding to a specified formula containing two alcoholic hydroxyl groups and having an OH number of from 112 to 389. The reactants are employed in quantities such that the NCO:OH equivalent ratio is from 2:1 to 50:1. The urethane-modified polyisocyanates of the present invention are particularly useful in the production of polyurethanes by the isocyanate polyaddition process.
Inventors
- 👤 Werner Rasshofer
- 👤 Richard Kopp
- 👤 Reiner Paul
- 👤 Klaus Seel
- 👤 Otto Ganster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8012; C08G18/8019; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4879; C08G2120/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
191 words
A process for the production of a urethanemodified polyisocyanate having an NCO-content of from 5 to 30 wt. % comprising reacting (a) an organic polyisocyanate of the diphenylmethane series consisting of a mixture of 4,4'-diisocyanatodiphenylmethane with up to 20% by weight of 2,4'-diisocyanatodiphenylmethane, up to 5% by weight 2,2'-diisocyanatodiphenylmethane and from 5 to 60% by weight of higher homologues thereof, said percents by weight being based on the total amount of the mixture, with (b) an organic polyhydroxyl compound which is an alkoxylation product containing two alcoholic hydroxyl groups and having an OH number of from 112 to 389 of a bisphenol corresponding to the formula ##STR2## in which R 1 represents a C 1 -C 4 alkyl radical, chlorine or bromine, R 2 and R 3 which may be the same or different each represent hydrogen or a C 1 -C 6 alkyl radical or together with the carbon atom attaching the two aromatic rings form a 5-membered to 7-membered cycloaliphatic hydrocarbon radical and n represents 0 or an integer from 1 to 4 in quantities such that the ratio of NCO to OH equivalents is from 4:1 to 20:1.
Claim 2
Dependent Claim
191 words
A process for the production of a urethanemodified polyisocyanate having an NCO-content of from 5 to 30 wt. % comprising reacting (a) an organic polyisocyanate of the diphenylmethane series consisting of a mixture of 4,4'-diisocyanatodiphenylmethane with up to 20% by weight of 2,4'-diisocyanatodiphenylmethane, up to 5% by weight 2,2'-diisocyanatodiphenylmethane and from 5 to 60% by weight of higher homologues thereof, said percents by weight being based on the total amount of the mixture, with (b) an organic polyhydroxyl compound which is an alkoxylation product containing two alcoholic hydroxyl groups and having an OH number of from 112 to 389 of a bisphenol corresponding to the formula ##STR2## in which R 1 represents a C 1 -C 4 alkyl radical, chlorine or bromine, R 2 and R 3 which may be the same or different each represent hydrogen or a C 1 -C 6 alkyl radical or together with the carbon atom attaching the two aromatic rings form a 5-membered to 7-membered cycloaliphatic hydrocarbon radical and n represents 0 or an integer from 1 to 4 in quantities such that the ratio of NCO to OH equivalents is from 4:1 to 20:1.
Claim 3
Dependent Claim
19 words
The process of claim 1 in which the alkoxylation product has a hydroxyl number of from 200 to 354.
Claim 4
Dependent Claim
19 words
The process of claim 1 in which the organic polyhydroxyl compound (b) is the dipropoxylation product of bisphenol A.
Claim 5
Dependent Claim
28 words
A process for the production of polyurethane plastics by the isocyanate polyaddition process comprising reacting the urethane-modified polyisocyanate of claim 1 with an organic compound having isocyanate-reactive groups.
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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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |