| 摘要 |
A light-curable elastomeric mixture is described, containing a) an elastomeric binder or binder mixture, b) a low molecular-weight compound which is polymerizable by a free-radical mechanism, is compatible with said binder or binder mixture, has at least one ethylenically unsaturated end group and has a boiling point above 100 DEG C. at normal pressure, and c) a compound or combination of compounds which is capable of initiating the polymerization of compound (b) under the action of actinic light, wherein said elastomeric binder is a block copolymer, soluble or dispersible in water or in an aqueous solution, having a structure selected from the group consisting of A-B, B-A-B, C-A-B, C-A-C-B, B-C-A-C-B, AnXBn, (A-B)xX, CnX(A-B)n, (C-A)nXBn, (C-A-B)nX, CnX(A-C-B)n, (C-A)nX(C-B)n, (C-A-C)nXBn, (C-A-C-B)nX, BnXAnXBn, X(B-A-B)nX, (B-C)nXAnX(C-B)n, BnX(C-A-C)nXBn and X(B-C-A-C-B)nX, in which A designates hydrophobic soft blocks having Tg <-30 DEG C., B designates hydrophilic rigid blocks comprising at least one acid groups and having Tg>+30 DEG C., C designates hydrophobic rigid blocks having Tg >+50 DEG C., X is a unit formed from a compound having at least two vinyl or isopropenyl groups or a homopolymer block formed from such compounds, and n is the numerical ratio of A and/or B and/or C homopolymer blocks relative to the unit X or to the homopolymer block X. The photocurable elastomeric mixtures are suited particularly well for the production of elastic relief printing plates.
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