US4009032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing waterless printing masters comprising copolymer of siloxane and thermoplastic blocks
Assignee: Xerox Corp
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Filing: 1974-10-23
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Granted: 1977-02-22
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Expires: 1994-10-23
Abstract
Abstract Improved waterless lithographic plates are provided. The master which comprises a copolymer of siloxane blocks crosslinked to an elastomeric ink releasing condition and organic thermoplastic blocks which are ink accepting is imaged with a particulate material, preferably an ink accepting thermoplastic polymer, and the thermoplastic blocks heated and cooled to bond the particulate imaging material thereto.
Inventors
- 👤 Richard L. Schank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:45
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/26; G03G13/28; G03G13/286; B; B41; B41N; B41N1/00; B41N1/003
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A method of preparing a printing master comprising coating a master substrate with a copolymer having from 50- 99% by weight siloxane blocks which are curable to an elastomeric ink releasable condition and organic ink accepting blocks which are thermoplastic when heated, selectively curing the siloxane blocks so as to render the polymer ink releasing but wherein the organic thermoplastic blocks are substantially uncrosslinked, depositing an ink accepting particulate material on said master in image configuration, and heating said coating to soften the organic thermoplastic blocks and allowing the coating to cool so as to bond the particulate imaging material to the master.
Claim 2
Independent Claim
103 words
A method of preparing a printing master comprising coating a master substrate with a copolymer having from 50- 99% by weight siloxane blocks which are curable to an elastomeric ink releasable condition and organic ink accepting blocks which are thermoplastic when heated, selectively curing the siloxane blocks so as to render the polymer ink releasing but wherein the organic thermoplastic blocks are substantially uncrosslinked, depositing an ink accepting particulate material on said master in image configuration, and heating said coating to soften the organic thermoplastic blocks and allowing the coating to cool so as to bond the particulate imaging material to the master.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the particulate imaging material deposited is a thermoplastic polymer.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the imaging material is deposited prior to curing of the siloxane blocks.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the copolymer comprises poly(alpha-methylstyrene) and polydimethylsiloxane blocks.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the copolymer comprises polystyrene and polydimethylsiloxane blocks.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the copolymer is coated on the master substrate with a catalyst.
Claim 8
Dependent Claim
12 words
The process of claim 6 wherein the catalyst is a peroxide catalyst.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the image is formed and developed directly on the master.
Claim 10
Dependent Claim
24 words
The process of claim 1 wherein the image is formed and developed on a separate photoconductive substrate and electrostatically transferred to the printing master.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein the master substrate is aluminum.
Claim 12
Dependent Claim
26 words
The process of claim 1 wherein subsequent to imaging, the particulate imaging material is removed by washing with a preferential solvent and the master is reimaged.
References Cited (Backward Citations)
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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) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |