Acetal polymers and use thereof in photosensitive compositions and lithographic printing plates

摘要

This invention relates to a binder containing the units A, B, C, D and E, wherein A is present in an amount of 10 to 60 mole% and is of the formula B is present in an amount of 1 to 30 mole% and is of the formula C is present in an amount of 5 to 60 mole% and is of the formula D is present in an amount of 0 to 60 mole% and is of the formula and E is present in an amount of 1 to 40 mole% and is of the formula wherein X is an aliphatic, aromatic or araliphatic spacer group, R<1> is hydrogen or an aliphatic, aromatic or araliphatic group, R<2>, R<3> and R<4> are hydrogen or alkyl groups with carbon numbers of from 1 to 18 and Y is a saturated or unsaturated chain- or ring-shaped spacer group, and photosensitive compositions containing this binder.