Patent US4857561A successfully refreshed from Google Patents.
US4857561A
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US
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Novel neopentyladipate based prepolymers and reaction injection molded products made therefrom
Assignee: Bayer Corp
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Filing: 1988-08-30
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Granted: 1989-08-15
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Expires: 2008-08-30
Abstract
Abstract The present invention is directed to a polyisocyanate comprising the reaction product of (a) an isocyanate selected from the group consisting of methylenebis(phenylisocyanate), polymethylenepoly(phenylisocyanate), and mixtures thereof, and (b) a polyester polyol having a hydroxyl functionality of from 2 to 3 and a molecular weight of from about 750 to about 3500, said polyester polyol prepared by reacting neopentyl glycol and adipic acid, the isocyanate group content of said reaction product from about 14% to about 28% by weight. The invention is also directed to a RIM process using such prepolymers.
Inventors
- 👤 Robson Mafoti
- 👤 Neil H. Nodelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:48
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G2120/00; C08G2410/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A polyisocyanate comprising the reaction product of (a) an isocyanate selected from the group consisting of methylenebis(phenylisocyanate), polymethylenepoly(phenylisocyanate), and mixtures thereof, and (b) a polyester polyol having a hydroxyl functionality of from 2 to 3 and a molecular weight of from about 750 to about 3500, said polyester polyol prepared by reacting neopentyl glycol and adipic acid, the isocyanate group content of said reaction product from about 14% to about 28% by weight.
Claim 2
Dependent Claim
73 words
A polyisocyanate comprising the reaction product of (a) an isocyanate selected from the group consisting of methylenebis(phenylisocyanate), polymethylenepoly(phenylisocyanate), and mixtures thereof, and (b) a polyester polyol having a hydroxyl functionality of from 2 to 3 and a molecular weight of from about 750 to about 3500, said polyester polyol prepared by reacting neopentyl glycol and adipic acid, the isocyanate group content of said reaction product from about 14% to about 28% by weight.
Claim 3
Dependent Claim
19 words
The polyisocyanate of claim 1, wherein said polyester has a molecular weight of from about 1000 to about 3000.
Claim 4
Dependent Claim
19 words
The polyisocyanate of claim 1, having an isocyanate group content of from about 16 to about 23% by weight.
Claim 5
Dependent Claim
116 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 comprising (i) a relatively high molecular weight active hydrogen containing material, (ii) an amine terminated chain extender and (iii) a polyisocyanate comprising the reaction product of (a) an isocyanate selected from the group consisting of methylenebis(phenylisocyanate), polymethylenepoly(phenylisocyanate), and mixtures thereof, and (b) a polyester polyol having a hydroxyl functionality of from 2 to 3 and a molecular weight of from about 750 to about 3500, said polyester polyol prepared by reacting neopentyl glycol and adipic acid, the isocyanate group content of said reaction product from about 14% to about 25% by weight.
Claim 6
Dependent Claim
116 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 comprising (i) a relatively high molecular weight active hydrogen containing material, (ii) an amine terminated chain extender and (iii) a polyisocyanate comprising the reaction product of (a) an isocyanate selected from the group consisting of methylenebis(phenylisocyanate), polymethylenepoly(phenylisocyanate), and mixtures thereof, and (b) a polyester polyol having a hydroxyl functionality of from 2 to 3 and a molecular weight of from about 750 to about 3500, said polyester polyol prepared by reacting neopentyl glycol and adipic acid, the isocyanate group content of said reaction product from about 14% to about 25% by weight.
Claim 7
Dependent Claim
17 words
The process of claim 4 wherein component (i) has a molecular weight of from 1800 to 12,000.
Claim 8
Dependent Claim
17 words
The process of claim 5, wherein component (ii) has a molecular weight of from 108 to 400.
Claim 9
Dependent Claim
9 words
The product produced by the process of claim 4.
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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) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |