Patent ID: 6645689
Filing Date: 2003-11-11
Classification: C08F,G03F

Abstract:
A copolymer for use in coating compositions for printing plate precursors, the copolymer comprising units A, B, and a unit C comprising a cyclic terminal urea group, wherein unit A is present in an amount of about 5 to about 50 mol % and has the formula wherein R1 is selected such that the homopolymer of A is alkali-soluble, unit B is present in an amount of about 20 to about 70 mol % and has the following formula wherein R2 is selected such that the homopolymer of B has a glass transition temperature greater than 100Â° C., preferably a glass transition temperature in the range from about 100 to about 380Â° C., and the unit C comprising a cyclic terminal urea group is present in an amount of about 10 to about 50 mol % and has the formula wherein X is a spacer group which is preferably selected from the group consisting of (a) a â€”(CR2)mâ€” chain, (b) a â€”[CH2â€”CH2â€”O]mâ€” chain; and (c) a â€”[Si(R2)â€”O]mâ€” unit, m is an integer between 2 and 12, the spacer group is connected to one of the carbon ring atoms of the cyclic urea unit or to one of the nitrogen atoms of the cyclic urea unit, and n is an integer between 1 and 5; and Y is a group selected from the group consisting of: â€ƒand wherein each R in units A, B, and C, the â€”(CR2)mâ€” chain, the â€”[Si(R2)â€”O]mâ€” unit, and group Y is independently selected from hydrogen, aryl, (C1-C12) alkyl, and halogen.