US4738993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rim microcellular polyurethane elastomer employing heteric or internal block ethylene oxide polyols
Assignee: BASF Corp
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Filing: 1985-10-22
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Granted: 1988-04-19
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Expires: 2005-10-22
Abstract
Abstract A RIM polyurethane elastomer prepared by reacting an organic polyisocyanate, a polyoxyalkylene polyether polyol, and a chain extender. The polyol contains from about 7 weight percent to about 40 weight percent ethylene oxide either as a block or a heteric structure.
Inventors
- 👤 Robert A. Markovs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:43
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4845; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G2110/00; C08G2110/0041; C08G2110/0066; C08G2120/00; Y; Y10; Y10S; Y10S521/00; Y10S521/914
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
A reaction injection molded microcellular polyurethane elastomer comprising the reaction product of an organic polyisocyanate, a polyoxyalkylene polyether polyol consisting of propylene oxide or butylene oxide, and ethylene oxide and a chain extender wherein said polyol has a molecular weight range from about 1000 to about 6000 and either a heteric or an internal ethylene oxide block structure containing from about 7 weight percent to about 40 weight percent ethylene oxide.
Claim 2
Dependent Claim
71 words
A reaction injection molded microcellular polyurethane elastomer comprising the reaction product of an organic polyisocyanate, a polyoxyalkylene polyether polyol consisting of propylene oxide or butylene oxide, and ethylene oxide and a chain extender wherein said polyol has a molecular weight range from about 1000 to about 6000 and either a heteric or an internal ethylene oxide block structure containing from about 7 weight percent to about 40 weight percent ethylene oxide.
Claim 3
Dependent Claim
11 words
The elastomer of claim 1 wherein the chain extender is 3,5-diethyltoluenediamine.
Claim 4
Dependent Claim
33 words
The elastomer of claim 2 wherein the concentration of 3,5-diethyltoluenediamiine is from about 10 weight percent to about 30 weight percent based on the total weight of the polyol and the chain extender.
Claim 5
Dependent Claim
12 words
The elastomer of claim 1 wherein the organic polyisocyanate is diphenylmethane diisocyanate.
Claim 6
Dependent Claim
74 words
A process for the preparation of a reaction injection molded microcellular polyurethane elastomer comprising reacting an organic polyisocyanate, a polyoxyalkylene polyether polyol consisting of propylene oxide or butylene oxide and ethylene oxide and a chain extender wherein said polyol has a molecular weight range from about 1000 to about 6000 and either a heteric or a internal ethylene oxide block structure containing from about 7 weight percent to about 40 weight percent ethylene oxide.
Claim 7
Dependent Claim
74 words
A process for the preparation of a reaction injection molded microcellular polyurethane elastomer comprising reacting an organic polyisocyanate, a polyoxyalkylene polyether polyol consisting of propylene oxide or butylene oxide and ethylene oxide and a chain extender wherein said polyol has a molecular weight range from about 1000 to about 6000 and either a heteric or a internal ethylene oxide block structure containing from about 7 weight percent to about 40 weight percent ethylene oxide.
Claim 8
Dependent Claim
11 words
The process of claim 5 wherein the chain extender is 3,5-diethyltoluenediamine.
Claim 9
Dependent Claim
33 words
The process of claim 6 wherein the concentration of 3,5-diethyltoluenediamine is from about 10 weight percent to about 30 weight percent based on the total weight of the polyol and the chain extender.
Claim 10
Dependent Claim
12 words
The process of claim 5 wherein the organic polyisocyanate is diphenylmethane diisocyanate.
References Cited (Backward Citations)
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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) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |