Patent US5346982A successfully refreshed from Google Patents.
US5346982A
Expired / Lapsed
US
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Heat-resistant adhesive
Assignee: Mitsui Chemicals Inc
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Filing: 1993-06-07
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Granted: 1994-09-13
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Expires: 2013-06-07
Abstract
Abstract A polyimide-based heat-resistant adhesive having excellent peel strength and heat resistance comprising polyimide composed of 10 to 99% by mole of structural units having the formula (1) and 1 to 90% by mole of structural units having the formula (2) or comprising polyamic acid precursor which corresponds to the polyimide. <IMAGE> (1) <IMAGE> <IMAGE> (2)
Inventors
- 👤 Shoji Tamai
- 👤 Katsuaki Iiyama
- 👤 Akihiro Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:38
CPC Classifications
C; C09; C09J; C09J179/00; C09J179/04; C09J179/08; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1071; Y; Y10; Y10S; Y10S526/00; Y10S526/935
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
42 words
A heat-resistant adhesive essentially consisting of a polyimide comprising in a polymer molecule from 10 to 99% by mole of structural units having the formula (1): ##STR13## and from 1 to 90% by mole of structural units having the formula (2): ##STR14##
Claim 2
Dependent Claim
42 words
A heat-resistant adhesive essentially consisting of a polyimide comprising in a polymer molecule from 10 to 99% by mole of structural units having the formula (1): ##STR13## and from 1 to 90% by mole of structural units having the formula (2): ##STR14##
Claim 3
Dependent Claim
51 words
A polyimide-based heat-resistant adhesive essentially consisting of a polyamic acid comprising in a polymer molecule from 10 to 99% by mole of structural units having the formula (3): ##STR15## and from 1 to 90% by mole of structural units having the formula (4): ##STR16## and a varnish comprising said polyamic acid.
Claim 4
Dependent Claim
51 words
A polyimide-based heat-resistant adhesive essentially consisting of a polyamic acid comprising in a polymer molecule from 10 to 99% by mole of structural units having the formula (3): ##STR15## and from 1 to 90% by mole of structural units having the formula (4): ##STR16## and a varnish comprising said polyamic acid.
Claim 5
Dependent Claim
35 words
The heat-resistant adhesive of claim 2 wherein the polyamic acid which is dissolved in N,N-dimethylacetamide to a concentration of 0.5 g/100 ml gives an inherent viscosity of from 0.1 to 3.0 dl/g at 35° C.
Claim 6
Dependent Claim
84 words
A heat-resistant adhesive essentially consisting of a polyimide obtained by thermally or chemically imidizing a polyamic acid comprising in a polymer molecule from 10 to 99% by mole of structural units having the formula (3): ##STR17## and from 1 to 90% by mole of structural units having the formula (4): ##STR18## said polyamic acid having an inherent viscosity of from 0.1 to 3.0 dl/g which is measured at 35° C. by dissolving said polyamic acid in N,N-dimethylacetamide to a concentration of 0.5 g/100 ml.
Claim 7
Dependent Claim
84 words
A heat-resistant adhesive essentially consisting of a polyimide obtained by thermally or chemically imidizing a polyamic acid comprising in a polymer molecule from 10 to 99% by mole of structural units having the formula (3): ##STR17## and from 1 to 90% by mole of structural units having the formula (4): ##STR18## said polyamic acid having an inherent viscosity of from 0.1 to 3.0 dl/g which is measured at 35° C. by dissolving said polyamic acid in N,N-dimethylacetamide to a concentration of 0.5 g/100 ml.
Claim 8
Dependent Claim
37 words
A heat-resistant adhesive consisting essentially of a polyimide comprising from 20 to 70% by mole of structural units having the formula (1): ##STR19## and from 30 to 80% by mole of structural units having the formula(2): ##STR20##
Claim 9
Dependent Claim
37 words
A heat-resistant adhesive consisting essentially of a polyimide comprising from 20 to 70% by mole of structural units having the formula (1): ##STR19## and from 30 to 80% by mole of structural units having the formula(2): ##STR20##
Claim 10
Dependent Claim
47 words
A polyimide-based heat-resistant adhesive consisting essentially of a polyamic acid comprising from 20 to 70% by mole of structural units having the formula (3): ##STR21## and from 30 to 80% by mole of structural units having the formula (4) ##STR22## and a varnish comprising said polyamic acid.
Claim 11
Dependent Claim
47 words
A polyimide-based heat-resistant adhesive consisting essentially of a polyamic acid comprising from 20 to 70% by mole of structural units having the formula (3): ##STR21## and from 30 to 80% by mole of structural units having the formula (4) ##STR22## and a varnish comprising said polyamic acid.
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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) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |