Photosensitive composition
First Claim
1. A photosensitive composition suitable for use in a planographic printing plate consisting essentially of(a) a copolymer in which, on weight basis,(l) from 30 to 80% of the repeating structural units of said copolymer are represented by the general formula (I) ##STR7## wherein R1 is a hydrogen atom or methyl group, R2 is a hydrogen atom, methyl, ethyl or chloromethyl group and n is an integer of 1 to 10;
- (2) from 5 to 60% of the repeating structural units of said copolymer are acrylonitrile units or methacrylonitrile of the units of the formula ##STR8## wherein R3 is hydrogen or methyl;
(3) repeating structural units of said copolymer include alpha, beta ethylenically unsaturated carboxylic acid units or the half ester units of a cycle acid anhydride with I, the amount of (3) being sufficient so that said copolymer has an acid value of 10 to 100; and
(4) from 64 to 0% of the repeating units of said copolymer are addition polymerizable ethylenically unsaturated compound units other than (1), (2), or (3), wherein said unsaturated compound is selected from the group consisting of acrylates, methacrylates, acrylamide, methacrylamide, allyl compounds, vinyl ethers, vinyl esters, styrenes or crotonates;
the viscosity of said copolymer being 1,000 to 20,000 cps as determined for a 33% by weight solution of said copolymer in ethylene glycol monomethyl ether at 25°
C by means of a Brookfield rotational viscosimeter, and(b) a diazonium compound, said copolymer being 50 to 95% by weight of the total weight of (a) and (b),wherein said photosensitive composition, if unexposed to actinic light, is soluble in a weak aqueous alkaline solution and wherein said photosensitive composition is insoluble in said solution if said photosensitive composition is exposed to actinic light.
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Abstract
A photosensitive composition is prepared comprising (a) a copolymer having an acid value of 10 to 100 and containing structural units represented by the following general formula I ##STR1## where R1 represents a hydrogen atom or methyl group, R2 represents a hydrogen atom, methyl group, ethyl group or chloromethyl group, and n is an integer of from 1 to 10, inclusive, and structural units represented by the following general formula II ##STR2## where, in the formula, R3 represents a hydrogen atom or methyl group, and
(b) a diazo compound and, optionally,
(c) a resin having hydrophilic groups.
48 Citations
21 Claims
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1. A photosensitive composition suitable for use in a planographic printing plate consisting essentially of
(a) a copolymer in which, on weight basis, (l) from 30 to 80% of the repeating structural units of said copolymer are represented by the general formula (I) ##STR7## wherein R1 is a hydrogen atom or methyl group, R2 is a hydrogen atom, methyl, ethyl or chloromethyl group and n is an integer of 1 to 10; -
(2) from 5 to 60% of the repeating structural units of said copolymer are acrylonitrile units or methacrylonitrile of the units of the formula ##STR8## wherein R3 is hydrogen or methyl;
(3) repeating structural units of said copolymer include alpha, beta ethylenically unsaturated carboxylic acid units or the half ester units of a cycle acid anhydride with I, the amount of (3) being sufficient so that said copolymer has an acid value of 10 to 100; and(4) from 64 to 0% of the repeating units of said copolymer are addition polymerizable ethylenically unsaturated compound units other than (1), (2), or (3), wherein said unsaturated compound is selected from the group consisting of acrylates, methacrylates, acrylamide, methacrylamide, allyl compounds, vinyl ethers, vinyl esters, styrenes or crotonates; the viscosity of said copolymer being 1,000 to 20,000 cps as determined for a 33% by weight solution of said copolymer in ethylene glycol monomethyl ether at 25°
C by means of a Brookfield rotational viscosimeter, and(b) a diazonium compound, said copolymer being 50 to 95% by weight of the total weight of (a) and (b), wherein said photosensitive composition, if unexposed to actinic light, is soluble in a weak aqueous alkaline solution and wherein said photosensitive composition is insoluble in said solution if said photosensitive composition is exposed to actinic light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification