US4273885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel catalyst system for RIM elastomers
Assignee: Huntsman Corp
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Filing: 1980-04-01
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Granted: 1981-06-16
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Expires: 2000-04-01
Abstract
Abstract The invention is a method for making reaction injection molded polyurethane of improved properties. The product comprises the reaction product of a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality, a polyisocyanate and a catalyst combination comprising a weak tertiary amine, a fast gelation organo tin compound and a delayed action organo tin catalyst. This catalyst combination results in improved processing, a minimum of surface defects and excellent green strength. Reaction injection molded elastomers are useful as molded articles of commerce including, but not limited to, vehicle body parts.
Inventors
- 👤 Richard J. G. Dominguez
- 👤 Doris M. Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:52
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/161; C08G18/163; C08G18/165; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G2120/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
In a method for making a polyurethane elastomer of significantly improved properties wherein an aromatic polyisocyanate, a polyol of above about 500 equivalent weight, a chain extending agent comprising a low molecular weight active hydrogen containing compound of at least 2 functionality and a catalyst system is injected via a RIM machine into a mold cavity of the desired configuration the improvement which comprises using as the catalyst system dimorpholinodiethylether, dibutyltin dilaurate and an alkyltin mercaptide.
Claim 2
Dependent Claim
76 words
In a method for making a polyurethane elastomer of significantly improved properties wherein an aromatic polyisocyanate, a polyol of above about 500 equivalent weight, a chain extending agent comprising a low molecular weight active hydrogen containing compound of at least 2 functionality and a catalyst system is injected via a RIM machine into a mold cavity of the desired configuration the improvement which comprises using as the catalyst system dimorpholinodiethylether, dibutyltin dilaurate and an alkyltin mercaptide.
Claim 3
Dependent Claim
22 words
A method as in claim 1 wherein the polyol comprises a polyether of about 5000 molecular weight based on a trihydric initiator.
Claim 4
Dependent Claim
12 words
A method as in claim 1 wherein the polyisocyanate comprises 4,4'diphenylmethane diisocyanate.
Claim 5
Dependent Claim
15 words
A method as in claim 1 wherein the elastomer is postcured at about 325° F.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |