Patent US3954686A successfully refreshed from Google Patents.
US3954686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low density foam resin composite of high stiffness
Assignee: United States Department of the Navy
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Filing: 1975-03-20
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Granted: 1976-05-04
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Expires: 1995-03-20
Abstract
Abstract The present invention relates to a method of producing low density polydiene resins having high yield strengths and the products thereof. In particular a polydiene resin, such as dihydroxyl terminated 1,2-polybutadiene is reacted at room temperature with an organic chain extender, such as hexamethylene -1,6-diisocyanate, and a graft comonomer such as N-vinyl-2-pyrrolidone in the presence of a peroxide free radical initiator, such as O,O'-bis(t-butyl peroxy) diisopropylbenzene, whereby a elastomeric material having the peroxide and a graft comonomer dispersed therethrough is produced. At a subsequent period of time, the elastomeric material can be exposed to elevated temperatures whereupon the elastomer is cured to a low density resin having a high yield strength.
Inventors
- 👤 Paul Lagally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:28
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; C08F; C08F279/00; C08F279/02; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/63; C08G18/635; C08G18/67; C08G18/69; C08J2351/00; C08J2351/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A process for producing a syntactic foam comprising: (I) reacting (A) a dihydroxy polydiene having (1) two terminal hydroxy groups and (2) a predominate amount of vinyl groups on alternate carbon atoms of the polydiene backbone with (B) an organic chain extender which is a diisocyanate in the presence of (C) a graft comonomer selected from the group consisting of N-vinyl-2-pyrrolidone, N-vinyl-3-pyrrolidone, N-vinylcarbazole, N-vinylimidazole, N-vinyl-pyridine, coumarone, indene and mixtures thereof, (D) a peroxide free radical initiator, and (E) a tris(alkylperoxy) vinyl silane to produce an elastomeric material having the peroxides,, the tris(alkylproxy) vinyl silane, and the graft comonomer dispersed therethough substantially unreacted, (II) packing microspheres into the elastomeric material wherein the microspheres are selected from the group consisting of hollow glass microspheres, hollow phenolic microspheres and mixtures thereof, and then (III) curing the elastomer at elevated temperatures to produce a firm resinous material containing the microspheres.
Claim 2
Dependent Claim
146 words
A process for producing a syntactic foam comprising: (I) reacting (A) a dihydroxy polydiene having (1) two terminal hydroxy groups and (2) a predominate amount of vinyl groups on alternate carbon atoms of the polydiene backbone with (B) an organic chain extender which is a diisocyanate in the presence of (C) a graft comonomer selected from the group consisting of N-vinyl-2-pyrrolidone, N-vinyl-3-pyrrolidone, N-vinylcarbazole, N-vinylimidazole, N-vinyl-pyridine, coumarone, indene and mixtures thereof, (D) a peroxide free radical initiator, and (E) a tris(alkylperoxy) vinyl silane to produce an elastomeric material having the peroxides,, the tris(alkylproxy) vinyl silane, and the graft comonomer dispersed therethough substantially unreacted, (II) packing microspheres into the elastomeric material wherein the microspheres are selected from the group consisting of hollow glass microspheres, hollow phenolic microspheres and mixtures thereof, and then (III) curing the elastomer at elevated temperatures to produce a firm resinous material containing the microspheres.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the tris(alkylperoxy) vinyl silane is tris(tert-butylperoxy) vinyl silane.
Claim 4
Dependent Claim
8 words
The product of the process of clain 1.
Claim 5
Dependent Claim
8 words
The product of the process of clain 1.
Claim 6
Dependent Claim
8 words
The product of the process of claim 2.
References Cited (Backward Citations)
US3515772A
Cited
US3585157A
Cited
US3510392A
Cited
US3700752A
Cited
US3868431A
Cited
US3850861A
Cited
US3865898A
Cited
US3849350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |