US4034132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propylene polymer adhered to enamel coated metal surface
Assignee: Continental Group Inc
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Filing: 1975-09-25
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Granted: 1977-07-05
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Expires: 1995-09-25
Abstract
Abstract The adhesion of propylene polymer layers to enamel coated metal surfaces is improved by incorporating an adhesion promoting amount of a carboxyl modified polypropylene resin in the enamel.
Inventors
- 👤 Ernesto H. Manuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:06
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B05; B05D; B05D5/00; B05D5/10; B05D7/00; B05D7/14; B05D7/16; B32B15/085; B32B15/18; C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C09; C09J; C09J5/00; C09J5/02; F; F16; F16B; F16B11/00; F16B11/006; B32B2255/00; B32B2255/06; B32B2255/26; B32B2311/00; B32B2311/30; B32B2323/00; B32B2323/10; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C09J2400/00; C09J2400/10; C09J2400/16; C09J2400/166; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31678; Y10T428/31688; Y10T428/31692
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
123 words
A method of bonding a propylene polymer to a metal surface which comprises: a. applying to the metal surface an enamel coating containing a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to about 25% by weight of a urea formaldehyde resin and about 0.1 to 5% by weight of a carboxyl modified polypropylene resin which is the reaction product of polypropylene and an unsaturated dicarboxylic acid or anhydride containing about 0.1% to about 5.0% by weight carboxyl groups, b. baking the enamel coating to cure and harden the coating, c. heat sealing a propylene polymer layer to the hardened enamel coating metal surface and then, d. cooling the heat sealed assembly to ambient temperature.
Claim 2
Independent Claim
123 words
A method of bonding a propylene polymer to a metal surface which comprises: a. applying to the metal surface an enamel coating containing a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to about 25% by weight of a urea formaldehyde resin and about 0.1 to 5% by weight of a carboxyl modified polypropylene resin which is the reaction product of polypropylene and an unsaturated dicarboxylic acid or anhydride containing about 0.1% to about 5.0% by weight carboxyl groups, b. baking the enamel coating to cure and harden the coating, c. heat sealing a propylene polymer layer to the hardened enamel coating metal surface and then, d. cooling the heat sealed assembly to ambient temperature.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the enamel coated metal surface having the propylene polymer sealed thereto is heat sealed to a second metal surface also having the enamel coating applied thereto.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the metal surface is steel.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the propylene polymer is polypropylene.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the unsaturated anhydride is maleic anhydrde.
Claim 7
Independent Claim
142 words
A method of securing metal substrates together comprising, a. applying to the metal substrate an enamel coating containing a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to about 20% by weight of an urea formaldehyde resin and about 0.1 to about 5% by weight of a carboxyl modified polypropylene resin which is the reaction product of polypropylene and an unsaturated dicarboxylic acid or anydride containing about 0.1% to about 5.0% by weight carboxyl groups, b. baking the enamel coating to cure and harden the coating, c. positioning a propylene polymer layer between portions of the enamel coated metal substrate to be secured, d. heating the propylene polymer layer to soften the layer and then e. applying to the metal substrate portions sufficient pressure to bond the metal substrates to the propylene polymer layer.
Claim 8
Independent Claim
142 words
A method of securing metal substrates together comprising, a. applying to the metal substrate an enamel coating containing a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to about 20% by weight of an urea formaldehyde resin and about 0.1 to about 5% by weight of a carboxyl modified polypropylene resin which is the reaction product of polypropylene and an unsaturated dicarboxylic acid or anydride containing about 0.1% to about 5.0% by weight carboxyl groups, b. baking the enamel coating to cure and harden the coating, c. positioning a propylene polymer layer between portions of the enamel coated metal substrate to be secured, d. heating the propylene polymer layer to soften the layer and then e. applying to the metal substrate portions sufficient pressure to bond the metal substrates to the propylene polymer layer.
Claim 9
Dependent Claim
11 words
The method of claim 6 wherein the propylene polymer is polypropylene.
Claim 10
Dependent Claim
11 words
The method of claim 6 wherein the metal substrate is steel.
Claim 11
Dependent Claim
93 words
A laminate comprised of overlapped metal substrates coated with an enamel coating comprised of a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to 25 percent by weight of an urea formaldehyde resin and about 0.1 to about 5% by weight of a carboxyl modified polypropylene which is the reaction product of polypropylene and an unsaturated dicarboxylic acid or anhydride containing about 0.1% to about 5.0% by weight carboxyl groups, the substrate being bonded with a propylene polymer interposed between the opposed enamel coated substrates.
Claim 12
Dependent Claim
93 words
A laminate comprised of overlapped metal substrates coated with an enamel coating comprised of a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to 25 percent by weight of an urea formaldehyde resin and about 0.1 to about 5% by weight of a carboxyl modified polypropylene which is the reaction product of polypropylene and an unsaturated dicarboxylic acid or anhydride containing about 0.1% to about 5.0% by weight carboxyl groups, the substrate being bonded with a propylene polymer interposed between the opposed enamel coated substrates.
Claim 13
Dependent Claim
116 words
An easy opening container member comprising a container end panel having a preformed opening, the end panel having applied thereto an enamel coating a removable closure member closing the opening, the closure member including a sealing surface of a propylene polymer heat sealed to the enamel coated surface comprised of a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to 25 percent by weight of an urea formaldehyde resin and about 0.1 to about 5% by weight of a carboxyl modified polypropylene resin which is the reaction product of a polypropylene and an unsaturated dicarboxylic acid or anhydride containing about 0.1 to about 5.0% by weight carboxyl groups.
Claim 14
Dependent Claim
116 words
An easy opening container member comprising a container end panel having a preformed opening, the end panel having applied thereto an enamel coating a removable closure member closing the opening, the closure member including a sealing surface of a propylene polymer heat sealed to the enamel coated surface comprised of a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to 25 percent by weight of an urea formaldehyde resin and about 0.1 to about 5% by weight of a carboxyl modified polypropylene resin which is the reaction product of a polypropylene and an unsaturated dicarboxylic acid or anhydride containing about 0.1 to about 5.0% by weight carboxyl groups.
Claim 15
Dependent Claim
117 words
A tubular sheet metal can body having a longitudinally extending lap seam, the opposed surface portions of the sheet metal included within said side seam having adhered thereto an enamel coating and a propylene polymer layer securing together the opposed surface portions of the enameled coated sheet, the enamel coating having incorporated therein a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to 25 percent by weight of an urea formaldehyde resin and about 0.1 to about 5% by weight of a carboxyl modified polypropylene resin which is the reaction product of polypropylene and an unsaturated dicarboxylic acid or anhydride containing about 0.1 to 5.0% by weight carboxyl groups.
Claim 16
Dependent Claim
117 words
A tubular sheet metal can body having a longitudinally extending lap seam, the opposed surface portions of the sheet metal included within said side seam having adhered thereto an enamel coating and a propylene polymer layer securing together the opposed surface portions of the enameled coated sheet, the enamel coating having incorporated therein a solids mixture of about 70 to about 90% by weight of an epoxy resin, about 5 to 25 percent by weight of an urea formaldehyde resin and about 0.1 to about 5% by weight of a carboxyl modified polypropylene resin which is the reaction product of polypropylene and an unsaturated dicarboxylic acid or anhydride containing about 0.1 to 5.0% by weight carboxyl groups.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |