US4576862A
Expired / Lapsed
US
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Polyimide laminant and process for the preparation of same
Assignee: Imi Tech Corp
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Filing: 1985-07-15
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Granted: 1986-03-18
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Expires: 2005-07-15
Abstract
Abstract A laminate and a method for its preparation comprising a polyimide foam, a fire-resistant, heat-activated adhesive overlaying a skin on the foam and a polyimide film adhered to the skin, with the laminate being prepared by contacting a foam in contact with the adhesive and film under heat and pressure to simultaneously form a skin on one surface of the foam and bond the polyimide film through the adhesive to the skin.
Inventors
- 👤 Raymond Lee
- 👤 Gregory A. Ferro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:23
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/065; B32B27/28; B32B27/281; B32B7/00; B32B7/04; B32B7/12; B32B2266/00; B32B2266/08; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7246; B32B2307/73; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985; Y10T428/249987; Y10T428/249988; Y10T428/249989; Y10T428/249991; Y10T428/249992; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
115 words
A laminate having improved vapor barrier properties comprising: (a) a polyimide foam prepared by forming a prepolymer formed from (1) an organic tetracarboxylic acid or anhydride or ester derivative, (2) an aromatic diamine having the formula: H.sub.2 N--R.sub.2 --NH.sub.2 wherein R 2 is an aromatic group containing 5 to 16 carbon atoms, and (3) an organic liquid diamine containing at least 50% by weight of a conjugated diene, said foam having a vapor impermeable skin on one surface thereof formed by heating one surface of the foam to coalesce the polyimide on the surface; (b) a fire-resistant, heat-activated adhesive layer overlaying the skin; and, (c) a polyimide film adhered to said skin by said adhesive.
Claim 2
Dependent Claim
115 words
A laminate having improved vapor barrier properties comprising: (a) a polyimide foam prepared by forming a prepolymer formed from (1) an organic tetracarboxylic acid or anhydride or ester derivative, (2) an aromatic diamine having the formula: H.sub.2 N--R.sub.2 --NH.sub.2 wherein R 2 is an aromatic group containing 5 to 16 carbon atoms, and (3) an organic liquid diamine containing at least 50% by weight of a conjugated diene, said foam having a vapor impermeable skin on one surface thereof formed by heating one surface of the foam to coalesce the polyimide on the surface; (b) a fire-resistant, heat-activated adhesive layer overlaying the skin; and, (c) a polyimide film adhered to said skin by said adhesive.
Claim 3
Dependent Claim
14 words
A laminate as defined in claim 1 wherein the adhesive is a fluorocarbon film.
Claim 4
Dependent Claim
24 words
A laminate as defined in claim 1 wherein the polyimide film is formed from pyromellitic dianhydride or a diester thereof and an aromatic diamine.
Claim 5
Dependent Claim
13 words
A laminate as defined in claim 3 wherein the aromatic diamine is ODA.
Claim 6
Dependent Claim
15 words
A laminate as defined in claim 1 wherein the adhesive is a fluorinated ethylene-propylene copolymer.
Claim 7
Dependent Claim
46 words
A laminate as defined in claim 1 wherein the organic diamine is an amine-terminated polymer of at least 50% by weight of a conjugated diene alone or copolymerized with at least one vinyl monomer copolymerizable therewith which is end blocked with an aliphatic or aromatic amine.
Claim 8
Dependent Claim
24 words
A laminate as defined in claim 6 wherein the vinyl monomer is selected from the group consisting of styrene, acrylonitrile, methacrylonitrile, and combinations thereof.
Claim 9
Dependent Claim
19 words
A laminate as defined in claim 1 wherein the tetracarboxylic acid is a di(loweralkyl) ester of benzophenone tetracarboxylic acid.
Claim 10
Dependent Claim
44 words
A laminate as defined in claim 1 wherein the tetracarboxylic acid derivative is a compound having the formula: ##STR5## wherein A is a tetravalent organic group and R 1 and R 4 are each selected from the group consisting of hydrogen and lower alkyl.
Claim 11
Dependent Claim
14 words
A laminate as defined in claim 1 wherein the aromatic diamine is methylene dianiline.
Claim 12
Dependent Claim
19 words
A laminate as defined in claim 1 which includes at least one aromatic and at least one heterocyclic diamine.
Claim 13
Dependent Claim
14 words
A laminate as defined in claim 1 which includes at least one aliphatic diamine.
Claim 14
Dependent Claim
41 words
A laminate as defined in claim 1 wherein the surface of the foam is contacted with a heated surface under conditions of heat and pressure sufficient to coalesce the cells of the foam to form the flexible, non porous, vapor-impermeable skin.
Claim 15
Dependent Claim
23 words
A laminate as defined in claim 1 wherein the surface is heated to a temperature within the range of 225° to 320° C.
Claim 16
Independent Claim
165 words
A method for preparing a laminate having a flexible, non-porous surface comprising the steps of heating at least one surface of a polyimide foam in contact with a fire-resistant, heat-activated adhesive layer and a polyimide film in contact with the adhesive layer under conditions of heat and pressure sufficient to melt the surface of the foam and cause the cells thereof to coalesce to form a flexible, non-porous, vapor-impermeable skin to which the polyimide is bonded by means of adhesive, said polyimide foam being prepared from a prepolymer formed from (1) an organic tetracarboxylic acid or anhydride or ester derivative, (2) an aromatic diamine having the formula: H.sub.2 N--R.sub.2 --NH.sub.2 wherein R 2 is an aromatic group containing 5 to 16 carbon atoms, and (3) an organic liquid diamine containing at least 50% by weight of a conjugated diene, said foam having a vapor impermeable skin on one surface thereof formed by heating one surface of the foam to coalesce the polyimide on the surface.
Claim 17
Independent Claim
165 words
A method for preparing a laminate having a flexible, non-porous surface comprising the steps of heating at least one surface of a polyimide foam in contact with a fire-resistant, heat-activated adhesive layer and a polyimide film in contact with the adhesive layer under conditions of heat and pressure sufficient to melt the surface of the foam and cause the cells thereof to coalesce to form a flexible, non-porous, vapor-impermeable skin to which the polyimide is bonded by means of adhesive, said polyimide foam being prepared from a prepolymer formed from (1) an organic tetracarboxylic acid or anhydride or ester derivative, (2) an aromatic diamine having the formula: H.sub.2 N--R.sub.2 --NH.sub.2 wherein R 2 is an aromatic group containing 5 to 16 carbon atoms, and (3) an organic liquid diamine containing at least 50% by weight of a conjugated diene, said foam having a vapor impermeable skin on one surface thereof formed by heating one surface of the foam to coalesce the polyimide on the surface.
Claim 18
Dependent Claim
33 words
A method as defined in claim 15 wherein the foam is contacted with a heated surface at a pressure sufficient to cause the cells of the foam to coalesce to form the skin.
Claim 19
Dependent Claim
26 words
A method as defined in claim 15 wherein the surface of the foam is heated to a temperature within the range of 225° to 320° C.
Claim 20
Dependent Claim
17 words
A method as defined in claim 17 wherein the foam is heated for at least 0.75 minutes.
Claim 21
Dependent Claim
46 words
A method as defined in claim 15 wherein the organic diamine is an amine-terminated polymer of at least 50% by weight of a conjugated diene alone or copolymerized with at least one vinyl monomer copolymerizable therewith which is end blocked with an aliphatic or aromatic amine.
Claim 22
Dependent Claim
24 words
A method as defined in claim 15 wherein the vinyl monomer is selected from the group consisting of styrene, acrylonitrile, methacrylonitrile, and combinations thereof.
Claim 23
Dependent Claim
19 words
A method as defined in claim 15 wherein the tetracarboxylic acid is a di(loweralkyl) ester of benzophenon tetracarboxylic acid.
Claim 24
Dependent Claim
20 words
A process as defined in claim 15 wherein the foam is prepared in the presence of a solid blowing agent.
Claim 25
Dependent Claim
29 words
A method as defined in claim 15 wherein the polyimide film is prepared by reaction of an organic tetracarboxylic acid or anhydride or ester derivative and an aromatic diamine.
Claim 26
Dependent Claim
15 words
A laminate as defined in claim 15 wherein the adhesive is a fluorinated ethylene-propylene copolymer.
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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |