| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermosetting resin composition excellent in curability, thermal stability, and strengths by compounding a novolak phenol resin with a hexamethylenetetramine salt of an amic acid oligomer as a curing agent. SOLUTION: This composition is prepared by compounding 100 pts.wt. novolak phenol resin with 7-30 pts.wt. hexamethylenetetramine salt of an amic acid oligomer as a curing agent. The oligomer is synthesized by reacting a tetracarboxylic dianhydride represented by formula II (wherein R1 is an aromatic group) with a diamine represented by formula III (wherein R2 is alkylene or phenylene) and is represented by formula I (wherein n is 4-8), having 4-8 repeating units each having four amide groups (as shown in the parentheses of formula I). A molding material prepared by using this composition can greatly decrease the curing time in the molding step, makes high-cycle molding possible, thus enhancing the productivity, and can give high-quality molded articles.
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