US4345022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovering unpolymerized photopolymer from printing plates
Assignee: Matrix Unlimited Inc
•
Filing: 1981-03-30
•
Granted: 1982-08-17
•
Expires: 2001-03-30
Abstract
Abstract A photopolymerizable composition of matter useful for photopolymeric printing surfaces is disclosed. Printing surfaces prepared from the composition are strong and wear well, resist solvents and abrasives, and are suitable for intaglio or gravure printing.
Inventors
- 👤 David R. Kress
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:23
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0387; G03F7/26; G03F7/30; G03F7/3092
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
84 words
A process for preparing a photopolymerizable composition of matter comprising: a. stripping unpolymerized material from an imagewise exposed and photopolymerized printing plate that contains an alcohol-soluble linear polyamide, photosensitizers, polymerization inhibitors, and a low molecular weight dicarboxylic acid or anhydride with a stripping fluid comprised of a mixture of water and a lower aliphatic alcohol; b. heating the resulting mixture of stripping fluid and stripped photopolymerizable composition to cause phase separation; and c. recovering the organic phase, which comprises said photopolymerizable composition of matter.
Claim 2
Dependent Claim
84 words
A process for preparing a photopolymerizable composition of matter comprising: a. stripping unpolymerized material from an imagewise exposed and photopolymerized printing plate that contains an alcohol-soluble linear polyamide, photosensitizers, polymerization inhibitors, and a low molecular weight dicarboxylic acid or anhydride with a stripping fluid comprised of a mixture of water and a lower aliphatic alcohol; b. heating the resulting mixture of stripping fluid and stripped photopolymerizable composition to cause phase separation; and c. recovering the organic phase, which comprises said photopolymerizable composition of matter.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein said heating is sufficient to convert said dicarboxylic acid or anhydride to a low molecular weight dicarboxylic acid diester.
References Cited (Backward Citations)
US3486891A
Cited
US3512971A
Cited
US3516828A
Cited
US3469982A
Cited
US3770435A
Cited
US3764324A
Cited
US3871929A
Cited
US4144073A
Cited
US4269930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |