US4331705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curing of polyamic acids or salts thereof by ultraviolet exposure
Assignee: 3M Co
•
Filing: 1980-02-11
•
Granted: 1982-05-25
•
Expires: 2000-02-11
Abstract
Abstract A process for curing a film of polyamic acid or a salt thereof to the corresponding polyimide comprising exposing the film to ultraviolet radiation for a sufficient time and at a sufficient intensity to cure same. The film can be selectively exposed in an imagewise fashion through an appropriate mask followed by developing to remove unexposed areas.
Inventors
- 👤 Rama P. Samudrala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:54
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0387
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
41 words
A process for curing a film of a polyamic acid or salt thereof to a corresponding polyimide comprising exposing at least one surface of said film to ultraviolet radiation at a sufficient intensity for a sufficient time to cure said film.
Claim 2
Dependent Claim
41 words
A process for curing a film of a polyamic acid or salt thereof to a corresponding polyimide comprising exposing at least one surface of said film to ultraviolet radiation at a sufficient intensity for a sufficient time to cure said film.
Claim 3
Dependent Claim
30 words
The process of claim 1, wherein said polyamic acid is selected from the group consisting of benzophenone tetracarboxylic dianhydride/hexane diamine, benzophenone tetracarboxylic dianhydride/oxydianiline, benzophenone tetracarboxylic dianhydride/methylene bis-cyclohexylamine, and pyromellitic dianhydride/oxydianiline.
Claim 4
Dependent Claim
42 words
A process for curing a film of a polyamic acid or salt thereof on a substrate to a corresponding polyimide comprising exposing the surface of said film to ultraviolet radiation at a sufficient intensity for a sufficient time to cure said film.
Claim 5
Dependent Claim
42 words
A process for curing a film of a polyamic acid or salt thereof on a substrate to a corresponding polyimide comprising exposing the surface of said film to ultraviolet radiation at a sufficient intensity for a sufficient time to cure said film.
Claim 6
Dependent Claim
31 words
The process of claim 3, wherein said polyamic acid film is selected from the group consisting of benzophenone tetracarboxylic dianhydride/hexane diamine, benzophenone tetracarboxylic dianhydride/oxydianiline, benzophenone tetracarboxylic dianhydride/methylene bis-cyclohexylamine, and pyromellitic dianhydride/oxydianiline.
Claim 7
Dependent Claim
75 words
A process for forming an imaged construction comprising a polyimide image on a substrate coated with a polyamic acid or salt thereof comprising the steps of: (a) exposing said polyamic acid or salt thereof to ultraviolet radiation in an imagewise fashion for a sufficient time at a sufficient intensity to cure said polyamic acid or salt thereof in exposed areas, unexposed areas remaining uncured, and (b) developing said unexposed areas with a suitable solvent therefor.
Claim 8
Dependent Claim
75 words
A process for forming an imaged construction comprising a polyimide image on a substrate coated with a polyamic acid or salt thereof comprising the steps of: (a) exposing said polyamic acid or salt thereof to ultraviolet radiation in an imagewise fashion for a sufficient time at a sufficient intensity to cure said polyamic acid or salt thereof in exposed areas, unexposed areas remaining uncured, and (b) developing said unexposed areas with a suitable solvent therefor.
Claim 9
Dependent Claim
30 words
The process of claim 5, wherein said polyamic acid is selected from the group consisting of benzophenone tetracarboxylic dianhydride/hexane diamine, benzophenone tetracarboxylic dianhydride/oxydianiline, benzophenone tetracarboxylic dianhydride/methylene bis-cyclohexylamine, and pyromellitic dianhydride/oxydianiline.
Claim 10
Dependent Claim
21 words
An article comprising a substrate having polyimide image areas thereon, said article having been formed from the process of claim 5.
References Cited (Backward Citations)
US4217389A
Cited
US3596125A
Cited
GB1316976A
Cited
US3733709A
Cited
US4055769A
Cited
US3840448A
Cited
GB1435151A
Cited
GB1463286A
Cited
US4101424A
Cited
US4107174A
Cited
US4135098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |