| 摘要 |
PURPOSE:To readily obtain stable titled powder free from hygroscopicity and blocking, resistant to hydrolysis, good in workability, excellent in characteristics as curing agent, by using a specific aliphatic dicarboxylic acid. CONSTITUTION:The objective powder consisting of a polymer with an average molecular weight 500-50,000 constituted by structural unit of formula [-R- is -(CH2)10- or -(CH2)18-]. This can be obtained by the reaction between (A) decane- 1,10-dicarboxylic acid or octadecane-1,18-dicarboxylic acid and at 90-150 deg.C (pref. at 110-120 deg.C). The size of said powder is pref. 30-150 mesh. When used as a curing agent for epoxy resin, cured products of improved flexibility and thermal stability will be obtained. This powder is also useful as a feedstock for the synthesis of a polyester for imparting urethanes with flexibility.
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