| 摘要 |
This invention is an acetal polymer having the following repeating units; (see formula) 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 percent, preferably 2-10 mole percent; n2 is 2-20 mole percent, preferably 5 to 15 mole percent; n3 is 15-85 mole percent, preferably 20 to 65 mole percent, n4 is 0 to 40 mole percent preferably 0 to20 mole percent; and n5 is 5-40 mole percent preferably 20 to 35 mole percent. These polymers may be used in photosensitive compositions and lithographic printing plates. |
