| 摘要 |
PURPOSE:To provide a heat-resistant adhesive consisting of polyamic acid and polyimic acid having specific recurring units, and capable of keeping the heat- resistance and adhesivity even at a high temperature. CONSTITUTION:The objective adhesive is composed of a polymer having the recurring unit of formula I [Y is 1-20C hydrocarbon group, hexafluoroisopropylidene, CO, S, SO or SO2 (oxide); Z is group of formula II or III; R is >=2C (cyclo)aliphatic group, (condensed polycyclic) aromatic group, or mutually connected non-condensed polycyclic aromatic groups]. The polymer wherein Z is group of formula II can be prepared by reacting (A) the compound of formula IV {e.g. 2,2-bis[4-(3-aminophenoxy)phenyl]propane} with (B) the compound of formula V (e.g. pyromellitic dianhydride) in a polar organic solvent (e.g. N,N-dimethylacetamide) preferably at <=50 deg.C e.g. for 4-24hr, and the product can be converted to another polymer wherein Y is group of formula III by thermally dehydrating e.g. at 100-300 deg.C.
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