| 摘要 |
PURPOSE:To obtain titled novel resin of extremely high purity and monodisperse molecular weight distribution, with its rosin groups regularly located in the side chain, by carrying out a reaction on heating between a dicarboxylic acid derivative and a rosin glycidyl ester. CONSTITUTION:The objective resin having structural unit of formula I [A is a divalent group of formula II, III, IV (R1 is H or methyl), V, VI (n is 2-8), VII(R2 is 8-18C alkyl or alkenyl), etc.; B is rosin residue], with a softening point of 50-190 deg.C, a glass transition point of 30-170 deg.C, and a number average molecular weight of 2,000-30,000, can be obtained by carrying out a reaction on heating between (A) a dicarboxylic acid derivative (or its anhydride) and (B) a rosin glycidyl ester, in the presence, if required, of (C) an organic amine. EFFECT:Having excellent dryability, blocking resistance, workability, etc., also capable of giving films of high strength. |
