| 摘要 |
<p>Photosensitive film-forming polymers obtained by the action of alkylating agents such as benzyl and alkyl sulphates or halides on polyvinylic alcohol derivatives. The latter result from the esterification of the alcohol by carboxylic or sulphonic acids comprising an azido or azidosulphonylphenyl group, so that free acid functions are present. The esterification takes place with an aminopyridine as catalyst. Said polymers are used in compositions for photoengraving on metals.</p> |
