US4012270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the adhesion of propylene polymers to enamel coated metal surfaces
Assignee: Continental Group Inc
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Filing: 1975-09-25
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Granted: 1977-03-15
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Expires: 1995-09-25
Abstract
Abstract Propylene polymers are heat sealed to enamel coated metal surfaces, the enamel having incorporated therein an adhesion promoting carboxyl modified polypropylene resin. The bond strength of the heat seal is improved by incorporating the carboxyl modified polypropylene resin in the enamel coating formulation dissolved in a hot (heated above 100° C) organic solvent solution selected from aliphatic acids, alcohols and hydrocarbons having at least 10 carbon atoms.
Inventors
- 👤 Chester W. Fitko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:43
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/06; B05D7/08; B05D7/10; C; C09; C09D; C09D163/00; C09J; C09J2400/00; C09J2400/10; C09J2400/16; C09J2400/166; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31529
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
186 words
A method of heat sealing a propylene polymer to a metal surface which comprises; a. preparing a solution of a carboxyl modified polypropylene resin by dissolving an adhesion promoting amount of the resin in a solvent heated to a temperature greater than 100° C, the solvent being selected from the group consisting of saturated and olefinic unsaturated aliphatic acids and alcohols having 10 to 22 carbon atoms and saturated and unsaturated hydrocarbons having 10 to 30 carbon atoms, b. adding the resin solution to an enamel coating formulation so that the modified enamel coating formulation is comprised of a solids mixture of about 60 to about 95% by weight of an epoxy resin about 5 to about 40% by weight of a urea formaldehyde resin and about 0.01 to about 5% by weight of the carboxyl modified polypropylene resin, c. applying the modified coating formulation to the metal surface, d. baking the modified coating formulation to cure and harden the coating, e. heat sealing a propylene polymer layer to the hardened enamel coated metal surface and then, f. cooling the heat sealed assembly to ambient temperature.
Claim 2
Independent Claim
186 words
A method of heat sealing a propylene polymer to a metal surface which comprises; a. preparing a solution of a carboxyl modified polypropylene resin by dissolving an adhesion promoting amount of the resin in a solvent heated to a temperature greater than 100° C, the solvent being selected from the group consisting of saturated and olefinic unsaturated aliphatic acids and alcohols having 10 to 22 carbon atoms and saturated and unsaturated hydrocarbons having 10 to 30 carbon atoms, b. adding the resin solution to an enamel coating formulation so that the modified enamel coating formulation is comprised of a solids mixture of about 60 to about 95% by weight of an epoxy resin about 5 to about 40% by weight of a urea formaldehyde resin and about 0.01 to about 5% by weight of the carboxyl modified polypropylene resin, c. applying the modified coating formulation to the metal surface, d. baking the modified coating formulation to cure and harden the coating, e. heat sealing a propylene polymer layer to the hardened enamel coated metal surface and then, f. cooling the heat sealed assembly to ambient temperature.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the solvent is oleyl alcohol.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the solvent is dodecyl alcohol.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the solvent is myristyl alcohol.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the solvent is cetyl alcohol.
Claim 7
Dependent Claim
11 words
The method of claim 1 wherein the solvent is stearyl alcohol.
Claim 8
Dependent Claim
11 words
The method of claim 1 wherein the solvent is tridecyl alcohol.
Claim 9
Dependent Claim
11 words
The method of claim 1 wherein the solvent is arachidyl alcohol.
Claim 10
Dependent Claim
11 words
The method of claim 1 wherein the solvent is oleic acid.
Claim 11
Dependent Claim
11 words
The method of claim 1 wherein the solvent is isostearic acid.
Claim 12
Dependent Claim
11 words
The method of claim 1 wherein the solvent is mineral oil.
Claim 13
Dependent Claim
10 words
The method of claim 1 wherein the solvent is 1-dodecane.
Claim 14
Dependent Claim
19 words
The method of claim 1 wherein the solvent is a mixture of C 11 -C 15 olefin unsaturated hydrocarbons.
Claim 15
Dependent Claim
34 words
The method of claim 1 wherein the carboxyl modified polypropylene resin 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.
Claim 16
Dependent Claim
12 words
The method of claim 14 wherein the saturated anhydride is maleic anhydride.
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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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |