US3721647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-package heat-curable urethane polymer casting composition
Assignee: ATK Launch Systems LLC
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Filing: 1971-12-20
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Granted: 1973-03-20
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Expires: 1991-12-20
Abstract
Abstract A one-package heat-curable urethane polymer casting composition which comprises three components is disclosed. The first component is a urethane prepolymer in which the isocyanate terminals have been blocked with a high molecular weight, solid, non-volatile, substituted phenol. The second component is a curative diamine in curative amounts. The third component is an organic acidic material in stabilizing amounts. The resultant composition of these components is stable at ambient temperature conditions. On the application of heat, however, this composition forms a void-free polyurethane which maintains its desirable urethane properties. Said composition is designed to be cast into thick sections, as opposed to thin films or coatings.
Inventors
- 👤 M Gillis
- 👤 M Mazzeo
- 👤 R Gobran
- 👤 A Santaniello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:14
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/089
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
22 words
A composition as in claim 1 wherein said prepolymer has a backbone selected from the group consisting of polyester and polyether backbones.
Claim 2
Dependent Claim
10 words
a curative amount of a multifunctional aromatic diamine curative; and
Claim 3
Dependent Claim
16 words
a stabilizing amount of an organic acid; wherein upon curing said composition produces a void-free casting.
Claim 4
Dependent Claim
13 words
A composition as in claim 1 wherein said prepolymer has a polyether backbone.
Claim 5
Dependent Claim
15 words
A composition as in claim 1 wherein said prepolymer has a poly (tetramethylene ether) backbone.
Claim 6
Dependent Claim
13 words
A composition as in claim 1 wherein said organic diisocyanate is tolylene diisocyanate.
Claim 7
Dependent Claim
16 words
A composition as in claim 1 wherein said high molecular weight, non-volatile, substituted phenol is monofunctional.
Claim 8
Dependent Claim
16 words
A composition as in claim 1 wherein said high molecular weight, non-volatile, substituted phenol is para-phenylphenol.
Claim 9
Dependent Claim
17 words
A composition as in claim 1 wherein said substituted phenol has a molecular weight above about 110.
Claim 10
Dependent Claim
17 words
A composition as in claim 1 wherein said substituted phenol has a molecular weight above about 150.
Claim 11
Dependent Claim
14 words
A composition as in claim 1 wherein said multifunctional aromatic amine curative is difunctional.
Claim 12
Dependent Claim
26 words
A composition as in claim 1 wherein said organic acid is selected from the group consisting of acetic acid, adipic acid, acrylic acid, and cinnamic acid.
Claim 13
Dependent Claim
38 words
A composition as in claim 1 wherein said blocked prepolymer is the adduct of para-phenylphenol and the reaction product of tolylene diisocyanate and poly(tetramethylene ether) glycol, said curative is metaphenylene diamine, and said organic acid is acrylic acid.
Claim 14
Dependent Claim
18 words
A composition as in claim 1 wherein said diamine curative is 1-12 percent by weight of the composition.
Claim 15
Dependent Claim
18 words
A composition as in claim 1 wherein said diamine curative is 1-8 percent by weight of the composition.
Claim 16
Dependent Claim
18 words
A composition as in claim 1 wherein said diamine curative is 2-5 percent by weight of the composition.
Claim 17
Dependent Claim
18 words
A composition as in claim 1 wherein said organic acid is 0.3-3 percent by weight of the composition.
Claim 18
Dependent Claim
18 words
A composition as in claim 1 wherein said organic acid is 0.5-2 percent by weight of the composition.
Claim 19
Dependent Claim
18 words
A composition as in claim 1 wherein said organic acid is 0.6-1.5 percent by weight of the composition.
Claim 20
Dependent Claim
38 words
A process comprising subjecting the composition of claim 1 in a mold to elevated temperature to unblock and cure the residual prepolymer in said mold, thereby forming a fully cured, molded, void-free, solid polyurethane part having elastomeric properties.
Claim 21
Dependent Claim
19 words
A process as in claim 19 wherein said molded part has a thickness of at least about one-sixteenth inch.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |