US4324822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal can paint providing coating retaining high adhesion even with lapse of time
Assignee: Toyo Seikan Group Holdings Ltd
•
Filing: 1980-07-03
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Granted: 1982-04-13
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Expires: 2000-07-03
Abstract
Abstract Disclosed is a paint for a can which comprises an epoxy resin component formed by condensation of a dihydroxyl compound with an epihalohydrin and a curing agent component, said epoxy resin component containing terminal α-glycol groups at a concentration of 0.05 to 0.60 equivalent per Kg of the resin. This paint provides a coating capable of retaining a high adhesion even with the lapse of time and resisting a severe treatment such as retort sterilization. When this paint is applied to a bonded can, leakage of the content from the side seam with the lapse of time can be effectively prevented. When this paint is applied to a can provided with an easy-open can lid, occurrence of the enamel feather can be prevented at the time of opening the lid.
Inventors
- 👤 Seishichi Kobayashi
- 👤 Tatsuo Mori
- 👤 Akihiko Morofuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:22
CPC Classifications
C; C09; C09D; C09D163/00; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; C08G59/00; C08G59/14; C08G59/1405; C08G59/1427; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4021; C08G59/42; C08G8/00; C08G8/04; C08G8/08; C08G8/24; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/31504; Y10T428/31511; Y10T428/31529
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A paint for cans which comprises (1) an epoxy resin component formed by condensation of a dihydroxyl compound with an epihalohydrin and (2) a curing agent component, said epoxy resin component containing terminal α-glycol groups at a concentration of 0.05 to 0.60 equivalents per Kg of the resin, and terminal epoxy groups at a concentration of 0.20 to 1.80 equivalents per Kg of the resin.
Claim 2
Dependent Claim
65 words
A paint for cans which comprises (1) an epoxy resin component formed by condensation of a dihydroxyl compound with an epihalohydrin and (2) a curing agent component, said epoxy resin component containing terminal α-glycol groups at a concentration of 0.05 to 0.60 equivalents per Kg of the resin, and terminal epoxy groups at a concentration of 0.20 to 1.80 equivalents per Kg of the resin.
Claim 3
Dependent Claim
42 words
A paint as set forth in claim 1 wherein the epoxy resin component is an epoxy resin in which the terminal α-glycol groups and the terminal epoxy groups are present at a molar ratio in the range of from 5/95 to 75/25.
Claim 4
Dependent Claim
172 words
A paint as set forth in claim 1 or 2 wherein the epoxy resin component is an epoxy resin represented by the following general formula: ##STR9## wherein R stands for a divalent residue formed by removing two hydroxyl groups from a dihydroxyl compound, espccially an alkylene or arylene group having 2 to 20 carbon atoms or a combination thereof, Y stands for ##STR10## or a hydrogen atom, with the proviso that the following conditions (a) to (d) are satisfied: (a) the concentration of ##STR11## is 0.05 to 0.60 equivalent per Kg of the resin, (b) the concentration of ##STR12## is 0.20 to 1.80 equivalents per Kg of the resin, (c) the molar ratio of ##STR13## is in the range of from 5/95 to 75/25 and (d) terminal hydroxyl groups derived from a dihydroxyl compound may be present in an amount of up to 50 mol % based on the total terminal groups, and n is a number selected so that the number average molecular weight of the resin is 900 to 5500.
Claim 5
Dependent Claim
29 words
A paint as set forth in claim 1 wherein the epoxy resin component is an epoxy resin formed by condensation of an epihalohydrin with bisphenol A or bisphenol B.
Claim 6
Dependent Claim
61 words
A solution-type can paint as set forth in claim 1 wherein the curing agent component is a resinous curing agent selected from the group consisting of phenol-formaldehyde resins, urea-formaldehyde resins, malamine-formaldehyde resins, acrylic resins, alkyd resins and polyamide resins and the resinous curing agent is present in an amount of 5 to 60% by weight based on the epoxy resin component.
Claim 7
Dependent Claim
40 words
A powdery can paint as set forth in claim 1 wherein the curing agent component is an acid anhydride or dicyandiamide and is present in an amount of 3 to 40% by weight based on the solid epoxy resin component.
Claim 8
Dependent Claim
31 words
A coated metal can which is coated and baked at least on the inner face of a can lid or can body with the paint as set forth in claim 1.
References Cited (Backward Citations)
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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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |