US4173290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonded can having high hot water resistance and undercoating composition for use in production thereof
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1978-02-07
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Granted: 1979-11-06
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Expires: 1998-02-07
Abstract
Abstract A bonded can having a high hot water resistance, which consists of a metal material having both the confronting side edges bonded together by a linear polyamide adhesive through an epoxy-phenolic resin undercoating composition, wherein said epoxy-phenolic resin undercoating composition comprises 50 to 95% by weight of an epoxy resin having a number average molecular weight of 800 to 5500, which is obtained by condensation of an epihalohydrin with bisphenol A, and 5 to 50% by weight of a resol-type phenol-aldehyde resin having a number average molecular weight of 200 to 1000, which is obtained by reacting a mixed phenol comprising 65 to 98% by weight of a dihydric phenol represented by the following general formula: ##STR1## wherein R stands for a bridging group or is a direct bond, and 2 to 35% by weight of a monohydric phenol, with an aldehyde in the presence of a basic catalyst. This bonded can can resist retort sterilization conducted at 122° to 135° C. without substantial reduction of the peel strength of the bonded portion.
Inventors
- 👤 Seishichi Kobayashi
- 👤 Tatsuo Mori
- 👤 Hiroshi Ueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:47
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/24; C09; C09D; C09D163/00; Y; Y10; Y10S; Y10S220/00; Y10S220/917; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31529; Y10T428/31678; Y10T428/31688; Y10T428/31725
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
A bonded can adapted to be subjected to a retort sterilization treatment, which consists of a metal material having both the confronting side edges bonded together by a linear polyamide adhesive through an epoxy-phenolic resin undercoating composition, wherein said epoxy-phenolic resin undercoating composition comprises 50 to 95% by weight of an epoxy resin having a number average molecular weight of 800 to 5500, which is obtained by condensation of an epihalohydrin with bisphenol A, and 5 to 50% by weight of a resol-type phenol-aldehyde resin having a number average molecular weight of 200 to 1000, which is obtained by reacting a mixed phenol comprising 65 to 98% by weight of a dihydric phenol represented by the following general formula: ##STR5## wherein R stands for a bridging group or is a direct bond, and 2 to 35% by weight of a monohydric phenol with an aldehyde in the presence of a basic catalyst.
Claim 2
Dependent Claim
152 words
A bonded can adapted to be subjected to a retort sterilization treatment, which consists of a metal material having both the confronting side edges bonded together by a linear polyamide adhesive through an epoxy-phenolic resin undercoating composition, wherein said epoxy-phenolic resin undercoating composition comprises 50 to 95% by weight of an epoxy resin having a number average molecular weight of 800 to 5500, which is obtained by condensation of an epihalohydrin with bisphenol A, and 5 to 50% by weight of a resol-type phenol-aldehyde resin having a number average molecular weight of 200 to 1000, which is obtained by reacting a mixed phenol comprising 65 to 98% by weight of a dihydric phenol represented by the following general formula: ##STR5## wherein R stands for a bridging group or is a direct bond, and 2 to 35% by weight of a monohydric phenol with an aldehyde in the presence of a basic catalyst.
Claim 3
Dependent Claim
69 words
A bonded can as set forth in claim 1 wherein said dihydric phenol is a dihydric phenol represented by the following general formula: ##STR6## wherein R is a direct bond or R stands for a group --O-- or --CR 1 R 2 -- in which R 1 and R 2 stand for a hydrogen or halogen atom or an alkyl or perhaloalkyl group having up to 4 carbon atoms.
Claim 4
Dependent Claim
17 words
A bonded can as set forth in claim 1 wherein said dihydric phenol is 2,2-bis(4-hydroxyphenyl)propane or 2,2-bis(4-hydroxyphenyl)butane.
Claim 5
Dependent Claim
25 words
A bonded can as set forth in claim 1 wherein said monohydric phenol is at least one member selected from bifunctional and trifunctional monohydric phenols.
Claim 6
Dependent Claim
94 words
A bonded can as set forth in claim 1 wherein said monohydric phenol is a bifunctional phenol represented by the following general formula: ##STR7## wherein R 4 stands for a hydrogen atom or an alkyl or alkoxy group having up to 4 carbon atoms with the proviso that two of three R 4 's stand for a hydrogen atom and one of them stands for an alkyl or alkoxy group having up to 4 carbon atoms, and R 5 stands for a hydrogen atom or an alkyl group having up to 4 carbon atoms.
Claim 7
Dependent Claim
36 words
A bonded can as set forth in claim 1 wherein in the resol-type phenol-aldehyde resin, said dihydric phenol (a) and said monohydric phenol (b) are contained at an (a)/(b) weight ratio of from 95/5 to 75/25.
Claim 8
Dependent Claim
45 words
A bonded can as set forth in claim 1 wherein the resol-type phenol-aldehyde resin is a resin having a number average molecular weight of 250 to 800, which is obtained by condensing 1 mole of said mixed phenol with 1.5 to 3.0 moles of formaldehyde.
Claim 9
Dependent Claim
23 words
A bonded can as set forth in claim 1 wherein said epoxy resin has a number average molecular weight of 1400 to 5500.
Claim 10
Dependent Claim
31 words
A bonded can as set forth in claim 1 wherein in said epoxy-phenolic undercoating composition, the epoxy resin/resol-type phenol-aldehyde resin weight ratio is in the range of from 90/10 to 60/40.
Claim 11
Dependent Claim
126 words
An undercoating composition for production of bonded cans to be subject to a retort sterlization treatment, which comprises 50 to 95% by weight of an epoxy resin having a number average molecular weight of 800 to 5500, which is obtained by condensation of an epihalohydrin with bisphenol A, and 5 to 50% by weight of a resol-type phenol-aldehyde resin having a number average molecular weight of 200 to 1000, which is obtained by reacting a mixed phenol comprising 65 to 98% by weight of a dihydric phenol represented by the following general formula: ##STR8## wherein R stands for a bridging group or is a direct bond, and 2 to 35% by weight of a monohydric phenol with an aldehyde in the presence of a basic catalyst.
Claim 12
Dependent Claim
126 words
An undercoating composition for production of bonded cans to be subject to a retort sterlization treatment, which comprises 50 to 95% by weight of an epoxy resin having a number average molecular weight of 800 to 5500, which is obtained by condensation of an epihalohydrin with bisphenol A, and 5 to 50% by weight of a resol-type phenol-aldehyde resin having a number average molecular weight of 200 to 1000, which is obtained by reacting a mixed phenol comprising 65 to 98% by weight of a dihydric phenol represented by the following general formula: ##STR8## wherein R stands for a bridging group or is a direct bond, and 2 to 35% by weight of a monohydric phenol with an aldehyde in the presence of a basic catalyst.
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) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |