Light sensitive copolymers, a process for their manufacture and copying compositions containing them

This invention relates to a light-sensitive copying composition which contains from 65 to 99 per cent by weight of at least one copolymer containing from 10 to 55 mole per cent of N-allyl-maleimide units, from 0 to 15 mole per cent of maleic acid units and from 45 to 80 mole per cent of units of the formula -CH2-CHZ-, wherein X is selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl or alkoxy group containing from 1 to 3 carbon atoms, an aryl group or an acyloxy group, and Z is selected from the group consisting of a hydrogen atom, a halogen atom or an alkyl group containing 1 to 2 carbon atoms, from 0 to 35 per cent by weight of at least one photopolymerizable compound having at least two vinyl or vinylidene groups in the molecule and which boils above 100 DEG C under standard pressure, and from 1 to 8 per cent by weight of at least one photoinitiator.