US3622331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate-cinnamate photopolymer
Assignee: Imperial Metal and Chemical Co
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Filing: 1969-06-23
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Granted: 1971-11-23
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Expires: 1989-06-23
Abstract
Abstract A polycarbonate resin is reacted with a cinnamoylating agent such as cinnamoyl chloride to produce a novel photopolymer, a polycarbonate-cinnamate resin. The photopolymers are useful for making photoresist plates and presensitized negative-working printing plates.
Inventors
- 👤 Daniel C Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:15
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64; C08G64/00; C08G64/04; C08G64/045; G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; Y; Y10; Y10S; Y10S525/00; Y10S525/925
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 words
A method for making polycarbonate-cinnamate photopolymer comprising: dissolving bisphenol A polycarbonate resin in a solvent, adding cinnamoyl chloride and dissolving it in the solvent, said chloride being added in sufficient amount to cinnamoylate terminal hydroxyl groups of said resin, heating the mixture at about 100* to 110* C. to react the polycarbonate with the cinnamoyl chloride and form a photopolymer, cooling the mixture, and precipitating out the resulting photopolymer from the solvent.
Claim 2
Dependent Claim
37 words
A photoresist plate, comprising a chemically etchable base covered with photopolymerizable polycarbonate-cinnamate reaction product of bisphenol A polycarbonate resin and cinnamoyl chloride, said chloride being added in sufficient amount to cinnamoylate terminal hydroxyl groups of said resin.
Claim 3
Dependent Claim
22 words
A presensitized negative-working printing plate comprising a negative-working diazo plate having a coating thereover of a reaction product according to claim 1.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |