| 摘要 |
PURPOSE:To obtain easily a novel reactive polymer useful as a chain extender, blocking agent, etc., showing improved performances, by reacting a polymer containing a free carboxylic acid group with a specific unsaturated oxazoline compound in a specific ratio. CONSTITUTION:(A) A polymer (e.g., copolymer of polymerizable monomer containing free carboxylic acid group, such as acrylic acid, and another unsaturated monomer, etc.) containing 0.01-5miliequivalent/g calculated as acid equivalent of free carboxylic acid group is reacted with (B) an unsaturated exazoline compound [preferably 2-vinyl-2-oxazoline, etc.] shown by the formula (R1 is H, or methyl; R2-R5 are H, or 1-4C alkyl) in a ratio wherein the amount of the component B is 0.05-1.2mol based on 1mol free carboxylic acid of the component A, to give the desired polymer. The reaction is carried out preferably at 50- 130 deg.C.
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