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US4596685A
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Oxyethylated aromatic amines and their use as chain extenders in the preparation of polyurethane-polyurea elastomers
Assignee: BASF Corp
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Filing: 1984-10-18
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Granted: 1986-06-24
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Expires: 2004-10-18
Abstract
Abstract This invention relates to oxyethylated toluenediamine and diaminodiphenylmethane and their use as chain extenders in the preparation of polyurethane-polyurea elastomers.
Inventors
- 👤 Robert A. Markovs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:53
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6523; C08G18/6535; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5033; C08G2120/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A process for preparing a polyurethane elastomer comprising reacting (a) an organic polyisocyanate (b) one or more polyols having an average molecular weight of about 1000 to about 10,000, having two to eight active hydrogen atoms and, (c) from about 1 to 50 parts of an oxyethylated amine selected from the group consisting of 2,4- and 2,6-toluenediamine and 2,4'- and 4,4'-diaminodiphenylmethane having the following structure ##STR3## said parts being based on 100 parts of polyol wherein the sum of a+b+c+d is from about 2 to 10.
Claim 2
Dependent Claim
86 words
A process for preparing a polyurethane elastomer comprising reacting (a) an organic polyisocyanate (b) one or more polyols having an average molecular weight of about 1000 to about 10,000, having two to eight active hydrogen atoms and, (c) from about 1 to 50 parts of an oxyethylated amine selected from the group consisting of 2,4- and 2,6-toluenediamine and 2,4'- and 4,4'-diaminodiphenylmethane having the following structure ##STR3## said parts being based on 100 parts of polyol wherein the sum of a+b+c+d is from about 2 to 10.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said polyol is a graft polymer dispersion in a polyoxyalkylene polyether polyol.
Claim 4
Dependent Claim
10 words
The process of claim 1 employing reaction injection molding techniques.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein the ratio of reactants is such that from 0.7 equivalent to 1.4 equivalents of isocyanate are present per equivalent of active hydrogen atoms.
Claim 6
Dependent Claim
31 words
The process of claim 1 wherein the organic polyisocyanate is selected from the group consisting of a urethane modified 4,4'-diphenylmethane diisocyanate, a carbodiimide modified 4,4'-diphenylmethane diisocyanate, polymethylene-polyphenyl isocyanates and mixtures thereof.
Claim 7
Dependent Claim
10 words
A molded polylurethane-polyurea elastomer prepared in accordance with claim 1.
Claim 8
Dependent Claim
14 words
A molded polyurethane-polyurea elastomer prepared in accordance with claims 2, 3, 4, and 5.
References Cited (Backward Citations)
US3159591A
Cited
US3499009A
Cited
US3597371A
Cited
US4209609A
Cited
US4342842A
Cited
US4397966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |