EP0069978A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Lithographic printing plate and its preparation
Assignee: Nippon Paint Co Ltd
•
Filing: 1982-07-07
•
Granted: —
•
Expires: 2002-07-07
Abstract
Abstract A photosensitive plate suitable for preparation of a waterless lithographic printing plate, which comprises a support material and a photosensitive layer provided thereon, said photosensitive layer being made of a photosensitive composition comprising an emulsion polymerization product of an acrylic or methacrylic monomer having a perfluoroalkyl group in the side chain and a water-soluble photosensitive substance resin whose water-solubility is variable by irradiation of ultraviolet rays.
Inventors
- 👤 Kiyomi Sakurai
- 👤 Seiji Arimatsu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 17:53
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/0046
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
A photosensitive plate suitable for preparation of a waterless lithographic printing plate, which comprises a support material and a photosensitive layer provided thereon, said photosensitive layer being made of a photosensitive composition comprising an emulsion polymerization product of an acrylic or methacrylic monomer having a perfluoroalkyl group in the side chain and a water-soluble photosensitive substance whose water-solubility is variable by irradiation of ultraviolet rays.
Claim 2
Dependent Claim
65 words
A photosensitive plate suitable for preparation of a waterless lithographic printing plate, which comprises a support material and a photosensitive layer provided thereon, said photosensitive layer being made of a photosensitive composition comprising an emulsion polymerization product of an acrylic or methacrylic monomer having a perfluoroalkyl group in the side chain and a water-soluble photosensitive substance whose water-solubility is variable by irradiation of ultraviolet rays.
Claim 3
Dependent Claim
20 words
The photosensitive plate according to claim 1,- wherein the support material is the one coated with the water-soluble photosensitive substance.
Claim 4
Dependent Claim
16 words
The photosensitive plate according to claim 1, wherein the water-soluble photosensitive substance is a diazo resin.
Claim 5
Dependent Claim
33 words
The photosensitive plate according to claim 1, wherein the weight proportion of the emulsion polymerization product and the water-soluble photosensitive rebstance in terms of the solid components is 100 : 0.5 - 500.
Claim 6
Dependent Claim
18 words
.5. The photosensitive plate according to claim 4, wherein the weight proportion is 100 : 1 - 400.
Claim 7
Dependent Claim
21 words
The photosensitive plate according to claim 1, wherein a water-impermeable plastic film is provided on the surface of the photosensitive layer.
Claim 8
Dependent Claim
48 words
A method for preparing a waterless lithographic printing plate, which comprises placing an original image film on the photosensitive plate according to claim 1, irradiating ultraviolet rays thereto, separating the irradiated plate from the image film and treating the separated plate with water for development of the image.
Claim 9
Dependent Claim
19 words
The method according to claim 7, wherein the plate after treatment with water is further subjected to heat treatment.
Claim 10
Dependent Claim
48 words
The method according to claim 7, wherein the image film has a negative image, and the treatment with water is effected for extracting the water-soluble photosensitive substance in the photosensitive composition at the non-exposed part to make the exposed part as imaged and the non-exposed part as non-imaged.
Claim 11
Dependent Claim
13 words
A waterless lithographic printing plate prepared by the method according to claim 7.
Claim 12
Dependent Claim
13 words
The lithographic printing plate according to claim 10-, which is of positive type.
Claim 13
Dependent Claim
13 words
The lithographic printing plate according to claim 10, which is of negative type.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.