Patent ID: 6143479
Filing Date: 2000-11-07
Classification: G03F

Abstract:
A composition useful as a developer for alkaline developable printing plates, the composition being an aqueous alkaline composition comprising:(a) at least one phosphonic acid derivative of formula I ##STR9## in which X is C.sub.2 -C.sub.6 alkylene or ##STR10## in which: k is 0 or 1; m is 1, 2, or 3; p is 1, 2, or 3; r is an integer from 10-20; R.sup.1 and R.sup.3 are each independently H or C.sub.1 -C.sub.4 alkyl; R.sup.2 and R.sup.4 are each independently H, OH, or C.sub.1 -C.sub.4 alkoxy; and Y is --R.sup.6 N--(CH.sub.2).sub.n --(NR.sup.5).sub.q --, in which q is 0 or 1, n is an integer from 0 to 8, and R.sup.5 and R.sup.6 are each independently H, C.sub.1 -C.sub.4 alkyl, or --CH.sub.2 --P(O)(OH).sub.2 ;(b) at least one polyglycol derivative of formula II ##STR11## in which R.sup.7 is hydrogen or C.sub.1 -C.sub.8 alkyl; R.sup.8 is hydrogen, methyl or ethyl; R.sup.9 is hydrogen or CH.sub.2 COOH; and n is an integer from 10 to 20; and(c) at least one glycol of formula III ##STR12## in which z is 0, 1, or 2; and R.sup.10 and R.sup.11 are each independently hydrogen or C.sub.1 -C.sub.3 alkyl.