Abstract It has been found that lithographic printing plates can be prepared by (a) photografting to an unsaturated oleophilic organic polymer substrate a potentially hydrophilic hydrolyzable mercapto-silane compound having the general formula WHERE R is an organic radical, X is selected from mono and dialkylamino, alkyl and aryl amido, alkoxy, aryloxy and alkyl and aryl oxycarbonyl radicals; T is selected from alkyl, cycloalkyl, aryl, alkaryl and aralkyl radicals, and the corresponding halogenated radicals; a is an integer from 1 to 3; b is an integer from 0 to 2; c is an integer from 1 to 3; and a+b+c equals 4; (b) washing away non-photografted mercapto-silane compound; and (c) amplifying the hydrophilicity of the hydrolyzable silane groups by treating with a soluble silicate solution or a colloidal silica dispersion.
A PROCESS FOR PREPARING A LITHOGRAPHIC PRINTING PLATE WHICH COMPRISES THE FOLLOWING STEPS: A. PHOTOGRAFTING IMAGEWISE TO AN UNSATURATED OLEOPHILIC ORGANIC POLYMER SUBSTRATE A HYDROLYZABLE MERCAPTOSILANE COMPOUND HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
31 words
A PROCESS FOR PREPARING A LITHOGRAPHIC PRINTING PLATE WHICH COMPRISES THE FOLLOWING STEPS: A. PHOTOGRAFTING IMAGEWISE TO AN UNSATURATED OLEOPHILIC ORGANIC POLYMER SUBSTRATE A HYDROLYZABLE MERCAPTOSILANE COMPOUND HAVING THE GENERAL FORMULA
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the oleophilic organic polymer substrate is a crosslinked polyester resin.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the amplifying agent is a silicate.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the amplifying agent is colloidal silica.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the amplifying agent is a mixture of silicate and colloidal silica.
Claim 7
Dependent Claim
11 words
A lithographic printing plate prepared by the process of claim 1.
Claim 8
Dependent Claim
66 words
In a process of preparing a lithographic printing plate which comprises photografting imagewise to an unsaturated oleophilic organic polymer substrate a hydrolyzable mercapto-silane compound and washing away non-photografted mercapto-silane compound from unexposed areas, the improvement of amplifying the hydrophilicity of the silane groups on the photografted hydrolyzed mercapto-silane compounds by treating with at least one amplifying agent selected from soluble silicate solutions and colloidal silica dispersions.
Claim 9
Dependent Claim
66 words
In a process of preparing a lithographic printing plate which comprises photografting imagewise to an unsaturated oleophilic organic polymer substrate a hydrolyzable mercapto-silane compound and washing away non-photografted mercapto-silane compound from unexposed areas, the improvement of amplifying the hydrophilicity of the silane groups on the photografted hydrolyzed mercapto-silane compounds by treating with at least one amplifying agent selected from soluble silicate solutions and colloidal silica dispersions.