US4214067A
Expired / Lapsed
US
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Sealing composition
Assignee: RCA Corp
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Filing: 1977-12-14
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Granted: 1980-07-22
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Expires: 1997-12-14
Abstract
Abstract A cured epoxy resin composition containing high concentrations of liquid polysulfide polymers has improved resistance to thermal cycling and degradation by moisture.
Inventors
- 👤 Marvin Packer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:31
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/03; E04D13/0305; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/66; C08L; C08L81/00; C09; C09J; C09J163/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
A composition for sealing acrylic plastics in frames which is resistant to adhesion failure induced by thermal and moisture variations of ambient weather consisting of a diglycidyl ether of bisphenol A, a liquid polysulfide polymer in a concentration of from at least about 1.25 to about 1.8 times the diglycidyl ether of bisphenol A concentration and a curing agent in an amount sufficient to cure the composition.
Claim 2
Dependent Claim
67 words
A composition for sealing acrylic plastics in frames which is resistant to adhesion failure induced by thermal and moisture variations of ambient weather consisting of a diglycidyl ether of bisphenol A, a liquid polysulfide polymer in a concentration of from at least about 1.25 to about 1.8 times the diglycidyl ether of bisphenol A concentration and a curing agent in an amount sufficient to cure the composition.
Claim 3
Dependent Claim
72 words
A composition according to claim 1 wherein the liquid polysulfide polymer is a mercaptan terminated long chain aliphatic polymer containing disulfide linkages with an average molecular weight of about 800 to about 1200 and a mercaptan content of about 6.0% to about 7.0% by weight an average viscosity of about 10 to about 15 poises at 25° C. and an average specific gravity of about 1.00 to about 1.50 at 25° C.
Claim 4
Dependent Claim
13 words
A composition according to claim 2 wherein the curing agent is 2,4,6-tri (dimethylaminomethyl)phenol.
Claim 5
Dependent Claim
51 words
A composition according to claim 1 wherein said composition is about 100 to about 120 parts by weight of said diglycidyl ether of bisphenol A, about 125 to about 180 parts by weight of said liquid polysulfide polymer, and about 10 to about 12 parts by weight of said curing agent.
Claim 6
Dependent Claim
73 words
A composition according to claim 4 wherein the liquid polysulfide polymer is a mercaptan terminated long chain aliphatic polymer containing disulfide linkages with an average molecular weight of about 800 to about 1200 and a mercaptan content of about 6.0 to about 7.0% by weight and an average viscosity of about 10 to about 15 poises at 25° C. and an average specific gravity of about 1.00 to about 1.50 at 25° C.
Claim 7
Dependent Claim
13 words
A composition according to claim 5 wherein the curing agent is 2,4,6-tri (dimethylaminomethyl)phenol.
Claim 8
Dependent Claim
42 words
A composition according to claim 6 wherein said composition is about 120 parts by weight of said diglycidyl ether of bisphenol A, about 165 parts by weight of said liquid polysulfide polymer, and about 12 parts by weight of said curing agent.
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) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |