US4048355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the formation of a polyolefin coating layer onto a metal surface
Assignee: Toa Paint Co Ltd
•
Filing: 1974-11-19
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Granted: 1977-09-13
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Expires: 1994-11-19
Abstract
Abstract A process for forming a polyolefin coating layer onto a surface of a metal which comprises coating an uncured epoxy resin layer onto the surface of a metal and melt-bonding a polyolefin modified with an unsaturated carboxylic acid or an anhydride thereof onto the uncured epoxy resin layer coated onto said metal surface. The coating layer has a high bonding strength and excellent water resistance, especially resistance against brine.
Inventors
- 👤 Seigo Sakayori
- 👤 Tomoyosi Kuro
- 👤 Kazuyuki Morita
- 👤 Nobuya Hinooka
- 👤 Hirozi Niimi
- 👤 Kensuke Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:31
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/148
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
170 words
A process for coating a metal surface with a polyolefin comprising: I. coating a metal surface with a first layer consisting essentially of an uncured epoxy resin and least one curing agent; and Ii. melt-bonding onto the first uncured layer, a second layer which is: A. a first polyolefin modified by copolymerization with one member of the group consisting of: i. an unsaturated dicarboxylic acid having the carboxylic groups attached to adjacent carbon atoms, ii. an anhydride of the acid of (i); or B. a blend of polyolefins consisting essentially of: i. a second polyolefin, and ii. the modified first polyolefin of (A), the polyolefin of (B) (i) and (B) (ii) being the same or different, with the provisos that: (1) for (A), the weight percentage of the repeating units of (A) (i) or (A) (ii) is from 10 -4 to 10% of the modified polyolefin; and (2) for (B), the weight percentage of the repeating units of (B) (ii) is from 10 -4 to 10% of the polyolefin blend.
Claim 2
Dependent Claim
170 words
A process for coating a metal surface with a polyolefin comprising: I. coating a metal surface with a first layer consisting essentially of an uncured epoxy resin and least one curing agent; and Ii. melt-bonding onto the first uncured layer, a second layer which is: A. a first polyolefin modified by copolymerization with one member of the group consisting of: i. an unsaturated dicarboxylic acid having the carboxylic groups attached to adjacent carbon atoms, ii. an anhydride of the acid of (i); or B. a blend of polyolefins consisting essentially of: i. a second polyolefin, and ii. the modified first polyolefin of (A), the polyolefin of (B) (i) and (B) (ii) being the same or different, with the provisos that: (1) for (A), the weight percentage of the repeating units of (A) (i) or (A) (ii) is from 10 -4 to 10% of the modified polyolefin; and (2) for (B), the weight percentage of the repeating units of (B) (ii) is from 10 -4 to 10% of the polyolefin blend.
Claim 3
Dependent Claim
11 words
The process of claim 1, wherein the second layer is (A).
Claim 4
Dependent Claim
31 words
The process of claim 2, wherein (A) (i) is present, and is selected from the group consisting of: maleic acid; citraconic acid; fumaric acid; 5-norbornene-2, 3-dicarboxylic acid; and 1-pentene-4, 5-dicarboxylic acid.
Claim 5
Dependent Claim
33 words
The process of claim 2, wherein (A) (ii) is present and is selected from the group consisting of anhydrides of: maleic acid; citraconic acid; fumaric acid; 5-norbornene-2, 3-dicarboxylic acid; and 1-pentene-4, 5-dicarboxylic acid.
Claim 6
Dependent Claim
22 words
The process of claim 2 wherein the polyolefin is selected from at least one of the group consisting of polyethylene and polypropylene.
Claim 7
Dependent Claim
11 words
The process of claim 1, wherein the second layer is (B).
Claim 8
Dependent Claim
33 words
The process of claim 6, wherein (B) (ii) is modified by copolymerization with a member of the group consisting of: maleic acid; citraconic acid; fumaric acid; 5-norbornene-2, 3-dicarboxylic aicd; and 1-pentene-4, 5-dicarboxylic acid.
Claim 9
Dependent Claim
37 words
The process of claim 6, wherein (B) (ii) is modified by copolymerization with the anhydride of an acid selected from the group consisting of: maleic acid; citraconic acid; fumaric acid 5-norbornene-2, 3-dicarboxylic acid; and 1-pentene-4, 5-dicarboxylic acid.
Claim 10
Dependent Claim
25 words
The process of claim 6 wherein the first and second polyolefins are selected from at least one of the group consisting of polyethylene and polypropylene.
Claim 11
Dependent Claim
16 words
The process of claim 5, wherein the polyolefin is modified by graft copolymerization with maleic anhydride.
Claim 12
Dependent Claim
16 words
The process of claim 9 wherein the polyolefin is modified by graft copolymerization with maleic anhydride.
Claim 13
Dependent Claim
19 words
The process of claim 1 wherein the uncured epoxy resin has a molecular weight of from 500 to 200,000.
Claim 14
Dependent Claim
20 words
The process of claim 1 wherein the uncured epoxy resin has a curing temperature of from 100° to 300° C.
Claim 15
Dependent Claim
17 words
The process of claim 1 wherein the weight percentage of proviso (1) is from 0.01 to 5.
Claim 16
Dependent Claim
17 words
The process of claim 1 wherein the weight percentage of proviso (2) is from 0.01 to 5.
Claim 17
Dependent Claim
30 words
The process of claim 1 including the additional step of heat-curing the first layer after the second layer has been applied, the curing temperature being from 80° to 300° C.
Claim 18
Dependent Claim
15 words
The process of claim 16 wherein the curing temperature is from 100° to 300° C.
Claim 19
Dependent Claim
36 words
The process of claim 16 wherein the second layer is (A), the polyolefin is selected from at least one of the group consisting of polyethylene and polypropylene and is modified by graft copolymerization with maleic anhydride.
Claim 20
Dependent Claim
36 words
The process of claim 16 wherein the second layer is (B), the polyolefin is selected from at least one of the group consisting of polyethylene and polypropylene and is modified by graft copolymerization with 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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |