Patent US2527222A successfully refreshed from Google Patents.
US4272618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat stable reaction injection molded elastomers
Assignee: Huntsman Corp
•
Filing: 1979-04-30
•
Granted: 1981-06-09
•
Expires: 1999-04-30
Abstract
Abstract The invention is a reaction injection molded polyurethane of improved properties comprising the cured reaction product of a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate. The reaction product is cured by subjecting it to an ambient temperature of from about 290°-425° F. for a time sufficient to achieve an improvement in properties. The invention is also a method for making such polyurethanes.
Inventors
- 👤 Richard J. G. Dominguez
- 👤 Doris M. Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08J3/244; B; B29; B29C; B29C67/00; B29C67/24; B29C67/246; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/82; B29C44/00; B29K; B29K2075/00; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/914; Y10S521/918
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
A reaction injection molded polyurethane elastomer having significantly improved properties comprising a cured reaction product of polyhydric polyethers of above about 500 molecular weight, a chain-extender and an aromatic polyisocyanate, said curing comprising subjecting said reaction product to an ambient temperature of from about 290° F. to 425° F. for a length of time sufficient to achieve an improvement in properties and wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product.
Claim 2
Dependent Claim
113 words
A reaction injection molded polyurethane elastomer having significantly improved properties comprising a cured reaction product of polyhydric polyethers of above about 500 molecular weight, a chain-extender and an aromatic polyisocyanate, said curing comprising subjecting said reaction product to an ambient temperature of from about 290° F. to 425° F. for a length of time sufficient to achieve an improvement in properties and wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product.
Claim 3
Dependent Claim
11 words
The polyurethane of claim 1 wherein said chain-extender comprises ethylene glycol.
Claim 4
Dependent Claim
13 words
A polyurethane product of claim 1 wherein said aromatic polyisocyanate is 4,4'-diphenylmethane diisocyanate.
Claim 5
Dependent Claim
33 words
The polyurethane of claim 1 wherein said polyol is a diol or triol having an equivalent weight of from about 1000 to about 3000 and contains at least about 50% primary hydroxyl groups.
Claim 6
Dependent Claim
18 words
The polyurethane of claim 1 wherein said polyol is a polyether polyol of above about 4000 molecular weight.
Claim 7
Dependent Claim
113 words
A reaction injection molded polyurethane elastomer having significantly improved properties comprising a cured reaction product of polyhydric polyethers of above about 500 molecular weight, a chain-extender and an aromatic polyisocyanate, said curing comprising subjecting said reaction product to an ambient temperature of from about 310° F. to 350° F. for a length of time sufficient to achieve an improvement in properites and wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product.
Claim 8
Dependent Claim
113 words
A reaction injection molded polyurethane elastomer having significantly improved properties comprising a cured reaction product of polyhydric polyethers of above about 500 molecular weight, a chain-extender and an aromatic polyisocyanate, said curing comprising subjecting said reaction product to an ambient temperature of from about 310° F. to 350° F. for a length of time sufficient to achieve an improvement in properites and wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product.
Claim 9
Dependent Claim
11 words
The polyurethane of claim 6 wherein said chain-extender comprises ethylene glycol.
Claim 10
Dependent Claim
13 words
A polyurethane product of claim 6 wherein said aromatic polyisocyanate is 4,4'-diphenylmethane diisocyanate.
Claim 11
Dependent Claim
33 words
The polyurethane of claim 6 wherein said polyol is a diol or triol having an equivalent weight of from about 1000 to about 3000 and contains at least about 50% primary hydroxyl groups.
Claim 12
Dependent Claim
18 words
The polyurethane of claim 6 wherein said polyol is a polyether polyol of above about 4000 molecular weight.
References Cited (Backward Citations)
GB1004924A
Cited
US3362979A
Cited
US3394164A
Cited
US3457234A
Cited
US3888803A
Cited
US4098773A
Cited
US4048105A
Cited
US4129697A
Cited
US4126742A
Cited
US4126741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |