Patent US3856559A successfully refreshed from Google Patents.
US3856559A
Expired / Lapsed
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Method of manufacturing composite films of heat resisting polymers
Assignee: Nitto Denko Corp
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Filing: 1972-09-28
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Granted: 1974-12-24
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Expires: 1992-09-28
Abstract
Abstract A method of manufacturing a heat-adhesive composite film of heat resisting polymers, such as polyimides, comprising applying a solution of a cresol-soluble, heterocyclic ring-containing polymer to at least one surface of a heat resisting support film formed from a solution of a heterocyclic ring-containing polymer which is soluble in aprotic polar solvents, such as Nmethylpyrrolidone, dimethylacetamide and dimethylformamide, but insoluble in cresols, and evaporating the solvent in the coating layer until the residual solvent content is reduced to 20% by weight or less based on the weight of the solid content in the solution to form a heat-adhesive layer, is disclosed.
Inventors
- 👤 K Nakagome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:35
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/30; C09J7/35; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C09J7/20; C09J7/22; C08J2479/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
A METHOD OF MANUFACTURING A HEAT ADHESIVE COMPOSITE FILM OF A HEAT RESISTING POLYMER HAVING THEREON A HEAT SOFTENABLE ADHESIVE LAYER COMPRISING APPLYING A SOLUTION OF A CRESOL-SOLUBLE HETEROCYCLIC RINGCONTANING POLYMER TO AT LEAST ONE SURFACE OF A HEAT RESISTING SUPPORT FILM FORMED FROM A SOLUTION OF A HETEROCYCLIC RING-CONTAINING POLYMER WHICH IS INSOLUBLE IN A CRESOL BUT SOLUBLE IN AN APROTIC POLAR SOLVENT, DRYING SAID COATED LAYER TO A RESIDUAL SOLVENT CONTENT OF 20% BY WEIGHT OR LESS BEASED ON THE WEIGHT OF THE SOLID CONTENT IN SAID COATED LAYER.
Claim 2
Independent Claim
91 words
A METHOD OF MANUFACTURING A HEAT ADHESIVE COMPOSITE FILM OF A HEAT RESISTING POLYMER HAVING THEREON A HEAT SOFTENABLE ADHESIVE LAYER COMPRISING APPLYING A SOLUTION OF A CRESOL-SOLUBLE HETEROCYCLIC RINGCONTANING POLYMER TO AT LEAST ONE SURFACE OF A HEAT RESISTING SUPPORT FILM FORMED FROM A SOLUTION OF A HETEROCYCLIC RING-CONTAINING POLYMER WHICH IS INSOLUBLE IN A CRESOL BUT SOLUBLE IN AN APROTIC POLAR SOLVENT, DRYING SAID COATED LAYER TO A RESIDUAL SOLVENT CONTENT OF 20% BY WEIGHT OR LESS BEASED ON THE WEIGHT OF THE SOLID CONTENT IN SAID COATED LAYER.
Claim 3
Dependent Claim
46 words
The method of claim 1, wherein said cresol-soluble, heterocyclic ring-containing polymer is polyhydantoin, copolymers of polyhydantoin and polyamide-imides, copolymers of polyhydantoin and alicyclic imide ring-containing polyimides, or poly(parabanic) acid and wherein said cresol-insoluble, aprotic polar solvent soluble heterocyclic ring-containing polymer is a polyimide or a polyamide-imide.
Claim 4
Dependent Claim
42 words
The method of claim 2, wherein saiD cresol-insoluble, aprotic polar solvent soluble heterocyclic ring-containing polymer is the condensation product of an aromatic tetracarboxylic acid dianhydride and a diamine, or the condensation product of an aromatic tricarboxylic acid anhydride with an organic diisocyanate.
Claim 5
Dependent Claim
86 words
The method of claim 3, wherein said aromatic tetracarboxylic acid dianhydride is pyromelitic dianhydride, 3,4,3'',4''-benzophenone tetracarboxylic dianhydride, 1,2,5,6-naphthalene tetracarboxylic dianhydride, 3,3'',4,4''-diphenyl tetracarboxylic dianhydride, bis(3,4-dicarboxyphenyl)ether dianhydride, bis(3,4-dicarboxyphenyl)methane dianhydride, or bis(3,4-dicarboxyphenyl) sulfone dianhydride, wherein said diamine is 4,4''-diaminodiphenylether, m-phenylene diamine, p-phenylene diamine, 4,4''-diaminodiphenyl methane, benzidine, 4,4''-diamino-diphenyl sulfide, or 4,4''-diamino-diphenyl sulfone, wherein said aromatic tricarboxylic acid anhydride is trimelitic anhydride, 4-carboxydiphenylmethane-3'',4''-dicarboxylic anhydride, 3-carboxydiphenylmethane-3'',4''-dicarboxylic anhydride, 4-carboxydiphenylether-3'',4''-dicarboxylic anhydride, 3-carboxydiphenylether-3'',4''-dicarboxylic anhydride, 4-carboxydiphenylketone-3'',4''-dicarboxylic anhydride, or 3-carboxydiphenylketone-3'',4''-dicarboxylic anhydride, and wherein said organic diisocyanate is diphenylmethane-4,4''-diisocyanate, p-phenylenediisocyanate, 2,4-tolylenediisocyanate, 1,5-naphthalenediisocyanate, diphenylether-4,4''-diisocyanate, hexamethylenediisocyanate, cyclohexane-1,4-diisocyanate, p-phenylenedithioisocyanate, or diphenylmethane-4,4''-dithioisocyanate.
Claim 6
Dependent Claim
16 words
The method of claim 1, wherein aprotic polar solvent is N-methyl pyrrolidone, dimethylacetamide, dimethylformamide, or dimethylsulfoxide.
Claim 7
Dependent Claim
17 words
The method of claim 1, wherein said residual solvent content is from 15 to 0.5% by weight.
Claim 8
Dependent Claim
67 words
The method of claim 1, wherein said drying of said coated layer to a residual solvent content of 20% by weight or less is initially at a first temperature lower than the boiling point of said solvent and subsequently at a second temperature of at least 10*C lower than the temperature of heat pressing said hot-melt adhesive layer, which second temperature is higher than the first temperature.
Claim 9
Dependent Claim
24 words
The method of claim 1, wherein said cresol-soluble heterocyclic ring-containing polymers have an intrinsic viscosity in N-methyl pyrrolidone at 30*C of at least 0.35.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |