| http://www.w3.org/ns/prov#value | - The curing agent (B-1) was a solid mixture of acid anhydride (a), acid anhydride (b) and dibasic acid (c) and had a melting point of 82??? C. The mixture was composed of the compounds of the formulas (1), (2) and (3) wherein R1 and R2 are methyl, m, p and r are an integer of 10, and n, q and s (polymerization degree) are 2.7 on average (determined by 1H-NMR analysis).
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