Copolymer for improving the chemical and developer resistance of positive working printing plates

摘要

Copolymers useful in radiation-sensitive layers of printing plates have the units A, B and C ;wherein unit A is present in an amount of 5 to a maximum of 50 mol % and R¹ and R⁴ are selected such that the homopolymer of A is alkali-soluble, B is present in an amount of 20-70 mol % and R², R⁶ and R⁷ are selected such that the homopolymer of B has a high glass transition temperature, and C is present in an amount of 10-50 mol % and R³ and R⁵ are selected such that the homopolymer of C is water-soluble and that unit A is different from unit C.