Graft polymer with unsaturated lateral chains, photosensitive mixture containing said graft polymer and recording material produced therefrom
AssigneeHoechst Aktiengesellschaft
InventorsWaltraud Mueller-Hess, Dieter Mohr, Matthias Kroggel
Life of this patent
Estimating the term…
Abstract
Disclosed is a graft polymer comprising a polyurethane graft backbone and grafted-on chains comprising vinyl alcohol units and units with lateral styrylpyridinium or styrylquinolinium groups, and also a photocurable mixture comprising the graft polymer and a photosensitive compound, such as a photosensitizer of a negative-working diazo compound. The mixture is suited for the production of printing plates, in particular planographic printing plates, and photoresists. Printing plates prepared from the mixture are distinguished by high photospeed, good developability with aqueous solutions and long print runs.
Claims28
A graft polymer comprising a polyurethane backbone and grafted-on chains which comprise units of vinyl alcohol and units with styrylpyridinium or styrylquinolinium groups that are lateral with respect to said grafted-on chains.
A graft polymer comprising a polyurethane graft backbone and grafted-on chains which comprise
- (a) about 0.5 to 50 mole % of units containing lateral styrylpyridinium or styrylquinolinium groups corresponding to the general formula I ##STR5## in which R.sup.1 denotes one of the groups ##STR6## m denotes an integer from 1 to 6, n denotes 0 or 1,
- R.sup.2 denotes hydrogen or an alkyl, alkenyl or aralkyl group,
- R.sup.3 denotes hydrogen or an alkyl group and
- X denotes the anion of the nitrogen base,
- (b) about 5 to 90 mole % of vinyl alcohol units,
- (c) about 0 to 85 mole % of vinyl acetal units, and
- (d) about 0 to 45 mole % of vinyl ester units of saturated aliphatic or aromatic carboxylic acids,
- wherein all mole percentages relate to the content of the polymer of grafted-on units.
Dependencies are inferred from the claim text.