US5098984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isocyanate terminated prepolymers and the use thereof in a rim process
Assignee: Bayer Corp
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Filing: 1990-06-15
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Granted: 1992-03-24
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Expires: 2010-06-15
Abstract
Abstract The present invention is directed to a novel prepolymer and the use thereof in a RIM process. The prepolymer is an isocyanate terminated prepolymer having an isocyanate group content of from about 10 to about 26% by weight, and being prepared by a process comprising: (a) reacting a C1 to C5 alkyl acetoacetate, with a polyol having a molecular weight of from about 500 to about 6000, and a hydroxyl functionality of from 2 to 4, and (b) reacting the resultant product with an organic di- and/or polyisocyanate.
Inventors
- 👤 Robson Mafoti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/42; C08G18/48; C08G18/4887; C08G2120/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
An isocyanate terminated prepolymer having an isocyanate group content of from about 10 to about 26% by weight, and being prepared by a process consisting essentially of comprising: (a) reacting a C 1 to C 5 alkyl acetoacetate, with a polyol having a molecular weight of from about 500 to about 6000, and a hydroxyl functionality of from 2 to 4, and (b) reacting the resultant product with an organic- di-and/or polyisocyanate.
Claim 2
Dependent Claim
72 words
An isocyanate terminated prepolymer having an isocyanate group content of from about 10 to about 26% by weight, and being prepared by a process consisting essentially of comprising: (a) reacting a C 1 to C 5 alkyl acetoacetate, with a polyol having a molecular weight of from about 500 to about 6000, and a hydroxyl functionality of from 2 to 4, and (b) reacting the resultant product with an organic- di-and/or polyisocyanate.
Claim 3
Dependent Claim
30 words
The prepolymer of claim 1, wherein said acetoacetate is a C 1 to C 4 alkyl acetoacetate, and wherein said polyol has a molecular weight of from 1000 to 4800.
Claim 4
Dependent Claim
29 words
The prepolymer of claim 1, wherein the acetoacetate is reacted with the polyol in a ratio such that one mole of acetoacetate is used for each hydroxyl group present,
Claim 5
Dependent Claim
24 words
The prepolymer of claim 1 wherein said organic di-and/or polyisocyanate is an isocyanate selected from the group consisting of methylenebis(phenylisocyanate, polymethylenepoly(phenylisocyanate), and mixtures thereof.
Claim 6
Dependent Claim
50 words
A process for preparing a reaction injection molded part by reacting a reaction mixture in a closed mold via the RIM process, said mixture consisting essentially of i) a relatively high molecular weight active hydrogen containing material, ii) an amine terminated chain extender and iii) the prepolymer of claim 1.
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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) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |