Patent US4042441A successfully refreshed from Google Patents.
US4042441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical-chemical linkage between polymer layers
Assignee: United States Department of the Navy
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Filing: 1976-05-06
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Granted: 1977-08-16
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Expires: 1996-05-06
Abstract
Abstract An elastomeric or rigid polymeric material, such as a propellant, is strongly bonded to an incompatible material, such as a silicon rubber liner, when a long chain polymer which is insoluble in and unreactive with the liner but has groups reactive with the propellant is added to the liquid or uncured liner. As the liner cures, the polymer chain migrates to the surface. Upon laying the propellant on the surface and curing the propellant, the propellant is cross-linked to the long chain polymer, which is entangled in the rubber liner.
Inventors
- 👤 Bernard Wasserman
- 👤 Martin H. Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:19
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C06; C06B; C06B45/00; C06B45/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A method of bonding a polymeric hydrocarbon to an incompatible rubber comprising the steps of: forming a long chain polymer containing at least one group insoluble in and non-reactive with said rubber but reactive with said polymeric hydrocarbon; forming a mixture of said long chain polymer and said rubber while the rubber is uncured; allowing said long chain polymer to migrate to a surface of said rubber; curing said rubber; and placing said polymeric hydrocarbon on said surface of the mixture, thereby reacting the reactive with the polymeric hydrocarbon and thereby bonding the rubber to the polymeric hydrocarbon; and curing said polymeric hydrocarbon on said incompatible rubber.
Claim 2
Independent Claim
107 words
A method of bonding a polymeric hydrocarbon to an incompatible rubber comprising the steps of: forming a long chain polymer containing at least one group insoluble in and non-reactive with said rubber but reactive with said polymeric hydrocarbon; forming a mixture of said long chain polymer and said rubber while the rubber is uncured; allowing said long chain polymer to migrate to a surface of said rubber; curing said rubber; and placing said polymeric hydrocarbon on said surface of the mixture, thereby reacting the reactive with the polymeric hydrocarbon and thereby bonding the rubber to the polymeric hydrocarbon; and curing said polymeric hydrocarbon on said incompatible rubber.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said rubber is silicone rubber.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein said long chain polymer is a copolymer of monomer units present in said polymeric hydrocarbon and different monomer units present in said rubber.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein said polymeric hydrocarbon is a solid propellant.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein said propellant comprises a binder of polybutadiene and isophorone diisocyanate.
Claim 7
Dependent Claim
26 words
The process of claim 5 wherein said rubber is silicone rubber and said long chain polymer is a block copolymer of poly (dimethyl silicone) and polybutadiene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |