Dry planographic printing plate
AssigneeToray Industries, Inc.
InventorsTakao Kitagawa, Shigeo Abiko, Tadami Kamaishi
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Abstract
Provided is a dry planographic printing plate containing on a base substrate a mixture which mixture comprises an organopolysiloxane; an alkoxy silane as a cross-linking agent represented by the formula R.sub.4-a-b R'.sub.a Si(OR").sub.b wherein a is 0 or 1, b is 2 or 3 and a+b is at most 3, R is an organic group containing a polar group or double bond and OR" is an alkoxy group; and a compound as a cross-linking catalyst represented by the formula (R.sup.1 O)(R.sup.2 O)(R.sup.3 O)(R.sup.4 O)M wherein M is titanium or zirconium, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each an organic group.
Claims11
A dry planographic printing plate which comprises a base substrate and an ink repellent silicone layer overlying the substrate, said silicone layer comprises a mixture of
- (A) an organopolysiloxane;
- (B) an alkoxy silane represented by the formula
- R.sub.4-a-b R'.sub.a Si(OR").sub.b
- wherein R is an organic group having 1 to 18 carbon atoms which contains a member selected from the group consisting of an olefinically unsaturated hydrocarbon group, an aromatic hydrocarbon group and a polar group which does not react with the OR" at room temperature, R' is an alkyl or alicyclic group having 1 to 18 carbon atoms, OR" is an alkoxy group having 1 to 8 carbon atoms, a is 0 or 1, b is 2 or 3, and a+b is at most 3;
- and
- (C) a titanium or a zirconium compound represented by the formula
- (R.sup.1 O)(R.sup.2 O)(R.sup.3 O)(R.sup.4 O)M
- wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 are each an organic group having 1 to 18 carbon atoms or an organic group having 1 to 18 carbon atoms containing a residue of >C.dbd.O, ##STR5## by which the group is bonded to the oxygen atom, and M is titanium or zirconium.
Dependencies are inferred from the claim text.