US4882411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of cold-setting polyurethane urea elastomers
Assignee: Bayer AG
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Filing: 1988-09-16
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Granted: 1989-11-21
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Expires: 2008-09-16
Abstract
Abstract The present invention relates to a process for the production of polyurethane urea elastomers from (a) NCO-terminated prepolymers based on polyisocyanates and polyethers having a molecular weight of 400 to about 10,000 and an ethylene oxide content of about 10 to 60 mole-% and (b) solid diaminodiphenyl ureas corresponding to the formula ##STR1## wherein R 1 , R 2 , R 3 and R 4 may be the same or different and represent hydrogen or C 1 -C 6 alkyl radicals and wherein the amino groups are in the m-and/or p-position to the urea group, characterized in that the NCO prepolymers are reacted with the diaminodiphenyl ureas in powder-form in a heterogeneous phase at temperatures of about 5° to 40° C. The present invention is also directed to the polyurethane urea elastomers prepared by this process.
Inventors
- 👤 Gerhard Grogler
- 👤 Andreas Ruckes
- 👤 Heinrich Hess
- 👤 Richard Kopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
A process for the preparation of a polyurethane urea elastomer from a mixture comprising (a) an NCO-terminated prepolymer based on a polyisocyanate and a polyether polyol having a molecular weight of 400 to about 10,000 and an ethylene oxide content of about 10 to 60 mole-% and (b) a solid diaminodiphenylurea corresponding to the formula ##STR5## wherein R 1 , R 2 , R 3 and R 4 may be the same or different and represent hydrogen or a C 1 -C 6 alkyl radical and wherein the amino groups are in the m- and/or p-position to the urea group, which comprises reacting said NCO-terminated prepolymer with said diaminodiphenyl urea in a heterogeneous phase at a temperature of about 5° to 40° C.
Claim 2
Dependent Claim
123 words
A process for the preparation of a polyurethane urea elastomer from a mixture comprising (a) an NCO-terminated prepolymer based on a polyisocyanate and a polyether polyol having a molecular weight of 400 to about 10,000 and an ethylene oxide content of about 10 to 60 mole-% and (b) a solid diaminodiphenylurea corresponding to the formula ##STR5## wherein R 1 , R 2 , R 3 and R 4 may be the same or different and represent hydrogen or a C 1 -C 6 alkyl radical and wherein the amino groups are in the m- and/or p-position to the urea group, which comprises reacting said NCO-terminated prepolymer with said diaminodiphenyl urea in a heterogeneous phase at a temperature of about 5° to 40° C.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said polyethers are polypropylene/polyethylene glycol ethers having a molecular weight of about 1000 to 6000.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein said ethylene oxide content is about 10 to 30 mole-%.
Claim 5
Dependent Claim
35 words
The process of claim 1 wherein said diaminodiphenyl urea is present in the form of a suspension in said polyether such that the ratio by weight of diaminodiphenylurea to polyol is about 1.0:0.5 to 1.0:5.0.
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein said diaminodiphenyl urea is present in the form of a suspension in said polyether such that the ratio by weight of diaminodiphenyl urea to polyol of about 1.0:1.0 to 1.0:2.0.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said diaminodiphenyl urea comprises 3,3'-diamino-4,4'-dimethyldiphenyl urea.
Claim 8
Dependent Claim
12 words
The process of claim 3 wherein said diaminodiphenyl urea comprises 3,3'-diamino-4,4'-dimethyldiphenyl urea.
Claim 9
Dependent Claim
12 words
The process of claim 4 wherein said diaminodiphenyl urea comprises 3,3'-diamino-4,4'-dimethyldiphenyl urea.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |