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US 6,143,479 AGranted
Developing system for alkaline-developable lithographic printing plates
AssigneeKodak Polychrome Graphics LLC
InventorsUlrich Fiebag, Hans-Joachim Timpe
Life of this patent
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Abstract
An aqueous alkaline composition comprising at least one phosphonic acid, at least one polyglycol derivative and at least one glycol. The composition can be used as either a developer or a replenisher for either positive-working or negative-working alkaline developable lithographic printing plates, including thermal plates.
Claims34
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.
12 more elements
A method for processing, comprising:
- (a) developing an imagewise exposed lithographic printing plate with an aqueous alkaline developer comprising:
- (i) at least one phosphonic acid derivative of formula I ##STR13## in which X is C.sub.2 -C.sub.6 alkylene or ##STR14## 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 ;
- (ii) at least one polyglycol derivative of formula II ##STR15## 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
- (iii) at least one glycol of formula III ##STR16## 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;
- and
- in which the developer has an original conductivity, the original conductivity being the conductivity of the developer before step (a).
15 more elements
Dependencies are inferred from the claim text.