Patent US3650809A successfully refreshed from Google Patents.
US3650809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene coated metal substrate and process of preparing same
Assignee: Continental Can Co Inc
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Filing: 1969-09-15
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Granted: 1972-03-21
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Expires: 1989-09-15
Abstract
Abstract A method for bonding polyethylene to an enamel coated metal surface wherein there is employed as a bond promoting interlayer between the polyethylene and enamel coated metal surface a resinous mixture of a carboxyl containing polyethylene resin and a vinyl butyral polymer. The polyethylene coated metal surface is suitable for the manufacture of metal containers.
Inventors
- 👤 Kenneth D Gilliam
- 👤 Alfred W Kehe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:34
CPC Classifications
B; B29; B29D; B29D12/00; B29D12/02; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B05D7/50; B05D7/56; B05D7/58; B05D2507/00; B05D2507/01; B05D2701/00; B05D7/57; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31855; Y10T428/31909; Y10T428/31938
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
36 words
The process of claim 1 wherein the polyethylene reaction product has a density greater than 0.94, a molecular weight of from about 1,500 to about 4,000, and contains about 1 to about 10 percent carboxyl groups.
Claim 2
Dependent Claim
12 words
The process of claim 2 wherein the unsaturated anhydride is maleic anhydride.
Claim 3
Dependent Claim
73 words
The process of claim 1 wherein the vinyl butyral polymer resin has a molecular weight between about 30,000 to about 300, 000, a butyral content of between about 80 to about 90 percent, calculated as polyvinyl butyral, a hydroxy content of between about 10 percent and about 20 percent by weight, calculated as polyvinyl alcohol, and an acetate content of between about 1 percent and 2.5 percent by weight, calculated as polyvinyl acetate.
Claim 4
Dependent Claim
79 words
A metal article coated with a cured thermosetting enamel coating having an adherent uniform layer of polyethylene bonded through an intermediate bond promoting layer of a resinous mixture of about 10 to about 99 percent by weight of the reaction product of polyethylene and an unsaturated dicarboxylic acid or anhydride containing about 0.05 to about 10 percent by weight of the acid or anhydride and about 1 to about 90 percent by weight of a vinyl butyral polymer resin.
Claim 5
Dependent Claim
36 words
The article of claim 5 wherein the polyethylene reaction product has a density greater than 0.94, a molecular weight of from about 1,500 to about 4,000, and contains about 1 to about 10 percent carboxyl groups.
Claim 6
Dependent Claim
24 words
The article of claim 5 wherein the carboxyl containing polyethylene resin is the reaction product of polyethylene and an unsaturated dicarboxylic acid or anhydride.
Claim 7
Dependent Claim
12 words
THe article of claim 5 wherein the unsaturated anhydride is maleic anhydride.
Claim 8
Dependent Claim
73 words
The article of claim 5 wherein the vinyl butyral polymer resin has a molecular weight between about 30,000 to about 300, 000, a butyral content of between about 80 to about 90 percent, calculated as polyvinyl butyral, a hydroxy content of between about 10 percent and about 20 percent by weight, calculated as polyvinyl alcohol, and an acetate content of between about 1 percent and 2.5 percent by weight, calculated as polyvinyl acetate.
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |