| 摘要 |
Copolymers containing the units A, B, C, D and optionally E are used to prepare radiation sensitive compositions and lithographic printing plates. The copolymer contains about 25 to 55 mol% of unit A which has the formula (A). The copolymer contains about 0.5 to 25 mol% of unit B which has the formula (B) wherein R<1> is selected from the group consisting of alkyl, aryl and aralkyl. The copolymer contains about 0.5 to 40 mol% of unit C which has the formula (C) wherein X is an aliphatic or aromatic spacer group, and Ac is an acidic group selected from the group consisting of -COOH, -SO3H, -SO2NR<9>R<10> with R<9> and R<10> independently being selected from hydrogen and alkyl; and when X is phenylene, Ac can also be OH. The copolymer contains about 20 to 70 mol% of unit D which has the formula (D) wherein Ci is selected from the group consisting of Ci-1, Ci-2, Ci-3 and Ci-4 which are represented by the following formulae (Ci-1, Ci-2, Ci-3 and Ci-4) wherein: k, m and n are integers independently selected from 0 to 5, R<3>, R<4> and R<7> are independently selected from the group consisting of alkyl, alkoxy, -COOR<8>, -NR<9>R<10>, -NH-CO-CH3, halogen, and cyano, R<8> is selected from hydrogen and alkyl, R<9> and R<10> are independently selected from hydrogen and alkyl, R<5> is selected from the group consisting of hydrogen, alkyl, aryl and aralkyl, R<6> is selected from the group consisting of alkyl, aryl and aralkyl and Y is selected from the group consisting of alkylene, arylene and arylenealkylene. The copolymer contains about 0 to 50 mol% of unit E which has the formula (E) wherein R<2> is selected from the group consisting if alkyl, aryl and aralkyl groups.
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