US4792576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyurethane moldings by the reaction injection molding process
Assignee: Bayer Corp
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Filing: 1987-07-23
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Granted: 1988-12-20
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Expires: 2007-07-23
Abstract
Abstract The present invention is directed to a process for the production of polyurethane moldings by reacting a reaction mixture comprising (a) an organic polyisocyanate (b) a compatible polyol blend comprising (i) at least one polyether polyol having an hydroxyl functionality of from 2 to 8, and a molecular weight of from 350 to below 1800, and (ii) at least one hydroxyl functional organic material containing from 2 to 8 hydroxyl groups and having a molecular weight below 350, components (i) and (ii) being used in a weight ratio of component (b)(i) to (b)(ii) of from about 10:1 to about 1:10, and (iii) no more than 45% by weight based on the weight of component (b) of an active hydrogen containing compound having a molecular weight of 1800 or more, said reaction mixture being processed as a one-shot system by the RIM process at an isocyanate index of from about 70 to about 130.
Inventors
- 👤 Neil H. Nodelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/667; C08G18/6674; C08G2120/00; C08G2130/00; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
149 words
A process for the production of polyurethane moldings by reacting a reaction mixture comprising (a) an organic polyisocyanate (b) a compatible polyol blend comprising (i) at least one polyether polyol having an hydroxyl functionality of from 2 to 8, and a molecular weight of from 350 to below 1800, and (ii) at least one hydroxyl functional organic material containing from 2 to 8 hydroxyl groups and having a molecular weight below 350, components (i) and (ii) being used in a weight ratio of component (b) (i) to (b) (ii) of from about 10:1 to about 1:10, and (iii) no more than 45% by weight based on the weight of component (b) of an active hydrogen containing compound having a molecular weight of 1800 or more, said reaction mixture being processed as a one-shot system by the RIM process at an isocyanate index of from about 70 to about 130.
Claim 2
Dependent Claim
149 words
A process for the production of polyurethane moldings by reacting a reaction mixture comprising (a) an organic polyisocyanate (b) a compatible polyol blend comprising (i) at least one polyether polyol having an hydroxyl functionality of from 2 to 8, and a molecular weight of from 350 to below 1800, and (ii) at least one hydroxyl functional organic material containing from 2 to 8 hydroxyl groups and having a molecular weight below 350, components (i) and (ii) being used in a weight ratio of component (b) (i) to (b) (ii) of from about 10:1 to about 1:10, and (iii) no more than 45% by weight based on the weight of component (b) of an active hydrogen containing compound having a molecular weight of 1800 or more, said reaction mixture being processed as a one-shot system by the RIM process at an isocyanate index of from about 70 to about 130.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein said organic polyisocyanate is selected from the group consisting of 4,4'-diisocyanatodiphenylmethane, polyisocyanates based on 4,4'-diisocyanatodiphenylmethane, or mixtures thereof.
Claim 4
Dependent Claim
26 words
The process of claim 1, further comprising the step of placing a reinforcing fiber mat in the mold cavity prior to introduction of the reaction mixture.
Claim 5
Dependent Claim
50 words
The process of claim 3, wherein component (a) is a polyphenylpolymethylene polyisocyanate obtained by the phosgenation of an aniline/formaldehyde condensate, said polyisocyanate having a viscosity at 25° C. of 200 mPa.s or less, and wherein the viscosity of said compatible polyol blend is 200 mPa.s or less at 25° C.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein said reaction mixture contains a blowing agent.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein component (b)(i) has a hydroxy functionality of from 2 to 4 and a molecular weight of from 350 to 1100.
Claim 8
Dependent Claim
15 words
The process of claim 6 wherein said organic material contains 2 or 3 hydroxyl groups.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein component (b)(iii) is present in an amount of no more than 15% by weight.
Claim 10
Dependent Claim
10 words
The process of claim 8 wherein component (b)(iii) is excluded.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein said reaction mixture contains a release agent.
Claim 12
Dependent Claim
11 words
A polyurethane molding made according to the process of claim 1.
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) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |