| 摘要 |
This invention is an acetal polymer having the following repeating units: <IMAGE> <IMAGE> <IMAGE> <IMAGE> where R is an alkyl group of 1 to 10 carbon atoms; Ar1 is an aromatic group substituted with an aliphatic group containing 3 to 20 carbon atoms or an alkoxy group having 3 to 20 carbon atoms; Ar2 is a non-substituted aromatic group; A1 is an acid group; n1, n2, n3, n4, n5 represent the molar percents of the respective repeating units and n1 is 0-20 mole %, preferably 2-10 mole %; n2 is 2-20 mole %, preferably 5 to 15 mole %; n3 is 15-85 mole %, preferably 20 to 65 mole %; n4 is 0 to 40 mole %, preferably 0 to 20 mole %; and n5 is 5-40 mole %, preferably 20 to 35 mole %. These polymers may be used in photosensitive compositions and lithographic printing plates. |
