US4081572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hydrophilic lithographic printing masters
Assignee: Xerox Corp
•
Filing: 1977-02-16
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Granted: 1978-03-28
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Expires: 1997-02-16
Abstract
Abstract Hydrophilic printing masters are provided comprising coating a self-supporting master substrate with a hydrophilic polymer containing carboxylic acid functionality and selectively converting this polymer in image configuration to a hydrophobic condition by heat.
Inventors
- 👤 Thomas J. Pacansky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:51
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; B; B41; B41C; B41C1/00; B41C1/10; B41C1/1041; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/107; Y10S430/146
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A method for preparing a printing master comprising: (a) providing a self-supporting master substrate, (b) providing a hydrophilic polymer of the formula: ##STR5## wherein R' is a carbonyl group or R and R' are the same or different hydrocarbon moieties which may be acyclic, aliphatic cyclic or bicyclic or aromatic, n is an integer of 0 or 1, x and y are integers of from 0 to 2 providing that when n is 0, y is 0, and when R' is a carbonyl group, y is 0, (c) coating said substrate with said polymer, and (d) selectively thermally converting said polymer to a hydrophobic condition in image configuration.
Claim 2
Independent Claim
108 words
A method for preparing a printing master comprising: (a) providing a self-supporting master substrate, (b) providing a hydrophilic polymer of the formula: ##STR5## wherein R' is a carbonyl group or R and R' are the same or different hydrocarbon moieties which may be acyclic, aliphatic cyclic or bicyclic or aromatic, n is an integer of 0 or 1, x and y are integers of from 0 to 2 providing that when n is 0, y is 0, and when R' is a carbonyl group, y is 0, (c) coating said substrate with said polymer, and (d) selectively thermally converting said polymer to a hydrophobic condition in image configuration.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the hydrophilic polymer is selectively converted to a hydrophobic condition in image configuration by laser exposure.
Claim 4
Dependent Claim
41 words
The method of claim 1 wherein the hydrophilic polymer is of the formula: ##STR6## wherein R is a hydrocarbon moiety of from 3 to 6 carbon atoms and the pendant carboxylic acid groups are positioned ortho to the adjacent carbonyl groups.
Claim 5
Dependent Claim
15 words
The printing master of claim 1 wherein the substrate is formed of aluminum or Mylar.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein the copolymer is formed of pyromellitic dianhydride and ethylene diamine.
Claim 7
Dependent Claim
14 words
The method of claim 3 wherein the substrate is formed of aluminum or Mylar.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein the polymer is formed of phthalic acid and isophthalic acid hydrazide.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein the copolymer is formed of pyromellitic dianhydride and isophthalic acid hydrazide.
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein the copolymer is formed of pyromellitic dianhydride and semicarbazide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |