US4476292A
Expired / Lapsed
US
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Castable polyurethane systems
Assignee: Huntsman Advanced Materials Americas LLC
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Filing: 1984-01-30
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Granted: 1984-10-09
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Expires: 2004-01-30
Abstract
Abstract A castable polyurethane system comprising the reaction product of (1) a polyisocyanate prepolymer prepared by reacting an excess of a polyisocyanate compound with an amine-based polyol and (2) a polyol, said polyurethane systems being clear, hard, easily cast, impact resistant, heat resistant and appropriate for a number of applicable uses.
Inventors
- 👤 Nancy M. Ham
- 👤 Teruko Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:00
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8041; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
44 words
A substantially clear, castable polyurethane system comprising the reaction product of (a) a polyisocyanate prepolymer comprising the reaction product of an excess of an aliphatic or cycloaliphatic polyisocyanate compound and an amine-based polyol, and (b) an amine-based polyol, a polyether polyol or mixtures thereof.
Claim 2
Dependent Claim
44 words
A substantially clear, castable polyurethane system comprising the reaction product of (a) a polyisocyanate prepolymer comprising the reaction product of an excess of an aliphatic or cycloaliphatic polyisocyanate compound and an amine-based polyol, and (b) an amine-based polyol, a polyether polyol or mixtures thereof.
Claim 3
Dependent Claim
19 words
The system of claim 1, wherein said polyisocyanate in said prepolymer is 4,4'-methylene bis(cyclohexylisocyanate), hexamethylene diisocyanate or isophorone diisocyanate.
Claim 4
Dependent Claim
20 words
The system of claim 1, wherein said amine-based polyol is N,N-bis(2-hydroxypropyl)aniline, N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine or a polymer of ethylene diamine-propylene oxide-ethylene oxide.
Claim 5
Dependent Claim
34 words
The system of claim 1, wherein the prepolymer contains 85-95% polyisocyanate and 5-15% amine-based polyol to form a prepolymer system of 20-55% polymer dissolved in 45-80% polyisocyanate, all percentages being on a weight basis.
Claim 6
Dependent Claim
16 words
The system of claim 1, wherein said polyether polyols have a molecular weight of from 60-7000.
Claim 7
Dependent Claim
34 words
The system of claim 5, wherein said polyether polyol is an aliphatic alkylene glycol polymer having an alkylene unit composed of at least two carbon atoms or a di-, tri- or tetra-functional polyol compound.
Claim 8
Dependent Claim
14 words
The system of claim 6, wherein said polyether polyol is a trifunctional polyol compound.
Claim 9
Dependent Claim
40 words
The system of claim 1, wherein said component (b) is a blend of an amine-based polyol and at least one polyether polyol, said amine-based polyol and said polyether polyol being present in a weight ratio of from 1:1 to 1:9.
Claim 10
Dependent Claim
14 words
The system of claim 8, wherein said polyether polyol is a trifunctional polyol compound.
Claim 11
Dependent Claim
30 words
The system of claim 1, wherein components (a) and (b) are present in stoichiometric amounts up to a 25% excess of component (a) or a 2% excess of component (b).
Claim 12
Dependent Claim
15 words
The system of claim 1 which also contains one or more light stabilizers and antioxidants.
Claim 13
Dependent Claim
47 words
The system of claim 1, wherein said prepolymer (a) is the reaction product of 4,4'-methylene bis(cyclohexylisocyanate) and N,N,N',N'-tetrakis(2-hydroxypropyl) ethylenediamine, and said polyol (b) is a blend of N,N,N'N'-tetrakis(2-hydroxypropyl)ethylenediamine, a polyether triol having a molecular weight of 615 and a polyether triol having a molecular weight of 4500.
Claim 14
Dependent Claim
20 words
The system of claim 10, wherein said prepolymer (a) and said polyol (b) are present in equal amounts by weight.
Claim 15
Dependent Claim
15 words
A shaped article comprising the polyurethane system of claim 1 subsequent to the curing thereof.
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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |