US4335829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated metal surfaces and method of coating metal surfaces with aqueous resinous dispersions of epoxy resins and acrylic polymers
Assignee: PPG Industries Inc
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Filing: 1978-11-29
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Granted: 1982-06-22
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Expires: 1998-11-29
Abstract
Abstract An aqueous resinous dispersion and a method of coating employing the aqueous resinous dispersion are disclosed. The aqueous resinous dispersions are solubilized with base and comprise an acrylic polymer containing N-ethoxymethylacrylamide or methacrylamide moieties and an epoxy resin. The dispersion is useful for coating metal containers particularly as a coating for the interior of containers which are used for alcoholic beverages, for example, beer cans.
Inventors
- 👤 Roger M. Christenson
- 👤 Rudolf Maska
- 👤 Rostyslaw Dowbenko
- 👤 Thomas R. Hockswender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:26
CPC Classifications
C; C09; C09D; C09D157/00; C09D157/06; C09D157/10; C09D133/00; C09D133/02; C09D133/24; C09D133/26; C09D157/12; C08; C08L; C08L63/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/31504; Y10T428/31511; Y10T428/31529; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
167 words
A method of coating metal surfaces which comprises: (I) applying to the metal surface a coating composition comprising an aqueous base-solubilized resinous dispersion in which the resinous phase comprises: (A) 15 to 90 percent by weight of a base-solubilized acrylic polymer which is formed by solution polymerizing in the absence of primary and secondary alcohols other than ethanol, the following monomer charge: (1) 15 to 85 percent by weight of an alpha, beta-ethylenically unsaturated carboxylic acid, (2) 5 to 85 percent by weight of N-ethoxymethylacrylamide or N-ethoxymethylmethacrylamide, (3) 0 to 80 percent by weight of a copolymerizable vinyl monomer different from (1) and (2); the percentages by weight of (1), (2) and (3) being based on total weight of (1), (2) and (3); (B) 10 to 85 percent by weight of an epoxy resin; the percentages by weight of (A) and (B) being based on total weight of (A) and (B); (II) heating the metal surface to a temperature sufficient to coalesce and cure said coating composition.
Claim 2
Independent Claim
167 words
A method of coating metal surfaces which comprises: (I) applying to the metal surface a coating composition comprising an aqueous base-solubilized resinous dispersion in which the resinous phase comprises: (A) 15 to 90 percent by weight of a base-solubilized acrylic polymer which is formed by solution polymerizing in the absence of primary and secondary alcohols other than ethanol, the following monomer charge: (1) 15 to 85 percent by weight of an alpha, beta-ethylenically unsaturated carboxylic acid, (2) 5 to 85 percent by weight of N-ethoxymethylacrylamide or N-ethoxymethylmethacrylamide, (3) 0 to 80 percent by weight of a copolymerizable vinyl monomer different from (1) and (2); the percentages by weight of (1), (2) and (3) being based on total weight of (1), (2) and (3); (B) 10 to 85 percent by weight of an epoxy resin; the percentages by weight of (A) and (B) being based on total weight of (A) and (B); (II) heating the metal surface to a temperature sufficient to coalesce and cure said coating composition.
Claim 3
Dependent Claim
20 words
The method of claim 1 in which (A)(1) is selected from the class consisting of acrylic acid and methacrylic acid.
Claim 4
Dependent Claim
10 words
The method of claim 1 in which (A)(2) is N-ethoxymethylacrylamide.
Claim 5
Dependent Claim
10 words
The method of claim 1 in which (A)(3) is styrene.
Claim 6
Dependent Claim
15 words
The method of claim 1 in which (B) is a polyglycidyl ether of a polyphenol.
Claim 7
Dependent Claim
12 words
The method of claim 5 in which the polyphenol is Bisphenol A.
Claim 8
Dependent Claim
15 words
The method of claim 1 in which the resinous dispersion additionally contains an aminoplast resin.
Claim 9
Dependent Claim
24 words
The method of claim 1 in which the metal surface is a container and the resinous dispersion is applied to the container's interior surface.
Claim 10
Dependent Claim
13 words
The method of claim 1 in which the metal is steel or aluminum.
Claim 11
Dependent Claim
10 words
A metal substrate coated by the method of claim 1.
Claim 12
Dependent Claim
28 words
The metal substrate of claim 10 which is in the form of a metal container and in which the resinous dispersion is applied to the container's interior surface.
Claim 13
Dependent Claim
12 words
The container of claim 11 which is made from aluminum or steel.
References Cited (Backward Citations)
CA694853A
Cited
US2992132A
Cited
US3008914A
Cited
US3198850A
Cited
US3215756A
Cited
US3492252A
Cited
US3509086A
Cited
US3908049A
Cited
US3943187A
Cited
US3997694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |