Patent US4362826A successfully refreshed from Google Patents.
US4362826A
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Heat-resistant resin composition
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1981-05-14
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Granted: 1982-12-07
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Expires: 2001-05-14
Abstract
Abstract A composition comprising a varnish of heat-resistant resin having active hydrogen in the molecule and a bismaleimide compound or derivative thereof admixed with the varnish affords a heat-resistant resin product of improved properties. Especially when a bismaleimide compound or derivative thereof is added to a varnish of polyimide resin having active hydrogen in the molecule and the composition is applied to a metal film substrate to form a resin film, the film has improved peel strength and, in itself, also has improved strength and elongation.
Inventors
- 👤 Kazuya Yonezawa
- 👤 Hirosaku Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:39
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; C08L79/085; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/125; C08G73/126; C08G73/127; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
A heat-resistant resin composition characterized in that the composition comprises a varnish of polyamide acid which is the precursor of polyimide heat-resistant resin having active hydrogen in the molecule and a bismaleimide compound or a derivative thereof admixed with the varnish.
Claim 2
Dependent Claim
41 words
A heat-resistant resin composition characterized in that the composition comprises a varnish of polyamide acid which is the precursor of polyimide heat-resistant resin having active hydrogen in the molecule and a bismaleimide compound or a derivative thereof admixed with the varnish.
Claim 3
Dependent Claim
33 words
A heat-resistant resin composition as defined in claim 1 wherein the varnish of heat-resistant resin having active hydrogen in the molecule is a varnish of polyimide resin having active hydrogen in the molecule.
Claim 4
Dependent Claim
33 words
A heat-resistant resin composition as defined in claim 1 wherein the varnish of heat-resistant resin having active hydrogen in the molecule is a varnish of polyamide acid which is the precursor of polyimide.
Claim 5
Dependent Claim
23 words
A heat-resistant resin composition as defined in claim 3 wherein the varnish of polyamide acid has an inherent viscosity of at least 1.0.
Claim 6
Dependent Claim
37 words
A heat-resistant resin composition as defined in claim 3 which comprises 0.1 to 30 parts by weight of the bismaleimide compound or derivative thereof per 100 parts by weight of the solids of the polyamide acid varnish.
Claim 7
Dependent Claim
37 words
A heat-resistant resin composition as defined in claim 5 which comprises 1 to 10 parts by weight of the bismaleimide compound or derivative thereof per 100 parts by weight of the solids of the polyamide acid varnish.
Claim 8
Dependent Claim
53 words
A heat-resistant resin composition as defined in claim 1 wherein the bismaleimide compound is represented by the formula ##STR7## wherein X is --CH 2 --, --O--, --S--, --SO 2 -- or --C(CH 3 ) 2 --, R and R' are alkyl or halogen, and p and q are 0 or integer of 1˜4.
Claim 9
Dependent Claim
36 words
A heat-resistant resin composition as defined in claim 7 wherein the bismaleimide compound is represented by the formula ##STR8## wherein X is --CH 2 --, --O--, --S--, --SO 2 --, or --C(CH 3 ) 2 --.
Claim 10
Dependent Claim
33 words
A heat-resistant resin composition as defined in claim 1 wherein the bismaleimide compound is represented by the formula ##STR9## wherein R" is alkyl or halogen, n is an integer of 1 or 2.
Claim 11
Dependent Claim
28 words
A heat-resistant resin composition as defined in claim 9 wherein the bismaleimide compound is represented by the formula ##STR10## wherein n is an integer of 1 or 2.
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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |