| 摘要 |
<p>PURPOSE:To obtain a printing ink with excellent heat resistance, adhesive properties, flexibility and electric characteristics by using a polyamic acid constituted of a plurality of specified structural repeating units and partially imidated as an essential component. CONSTITUTION:A polyamic acid constituted of repeating units of formulas I-III (wherein R<1> is a tetravalent org. group; R<2> is a divalent org. group) and partially imidated (e.g. a compd. consisting of p-phenylenediamine, 4,4'- diaminodiphenyl ether and 3,3',4,4'-biphenyltetracarboxylic acid dianhydride) is used as an essential component.</p> |
