US4975516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaminoarylsulfones useful for the preparation of polyurethane elastomers
Assignee: Bayer AG
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Filing: 1989-01-10
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Granted: 1990-12-04
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Expires: 2009-01-10
Abstract
Abstract This invention relates to diaminoarylsulfones of the formula ##STR1## wherein R 1 , R 2 , and R 3 are independently C 1 -C 12 alkyl, that are useful as chain extenders in the preparation of polyurethane elastomers.
Inventors
- 👤 Klaus-Peter Heise
- 👤 Gerhard Grogler
- 👤 Karlfried Wedemeyer
- 👤 Dieter Dieterich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:47
CPC Classifications
C; C07; C07C; C07C317/00; C07C317/26; C07C317/32; C07C317/34; C07C317/36; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3863; C08G18/3865; C08G18/3872; C08G2120/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
23 words
A compound having the formula ##STR7## wherein R 1 , R 2 , and R 3 are independently C 1 -C 12 alkyl.
Claim 2
Dependent Claim
23 words
A compound having the formula ##STR7## wherein R 1 , R 2 , and R 3 are independently C 1 -C 12 alkyl.
Claim 3
Dependent Claim
23 words
A compound according to claim 1 wherein R 1 , R 2 , and R 3 are independently C 1 -C 6 alkyl.
Claim 4
Dependent Claim
14 words
A compound according to claim 1 wherein R 1 and R 2 are methyl.
Claim 5
Dependent Claim
13 words
A compound according to claim 1 selected from the group consisting of ##STR8##
Claim 6
Dependent Claim
48 words
A method of preparing a polyurethane elastomer comprising reacting a mixture of one or more diisocyanates, one or more compounds having a molecular weight of from about 800 to about 5,000 and containing at least two hydroxyl groups, and a compound according to claim 1 as chain extender.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |