Darby & Darby
Cyclic dione polymer
 The present invention provides a cyclic dione polymer, which is a homopolymer or a copolymer of a cyclic dione monomer selected from those represented by formulae (I) and (II) ##STR1## wherein PA1 A and B may be the same or different and are independently selected from the group consisting of halogen, hydrogen, C.sub.3-20 cyclic or pericyclic alkyl, C.sub.1-20 linear and branched alkyl, C.sub.6-20 aryl, C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl, silyl, alkylsilyl, germyl, alkylgermyl, alkoxycarbonyl, acyl, and a heterocylic group; or, A and B are linked together to form a C.sub.3-20 saturated or unsaturated cyclic hydrocarbon group or a substituted or unsubstituted heterocyclic group; PA1 C is selected from the group consisting of oxygen, sulfur, ##STR2## --CH.sub.2 --, and --SiH.sub.2 --, PA2 wherein each R.sup.1 is independently selected from C.sub.1-20 alkyl and phenyl. 
Everlight Chemical Industrial Corporation Industrial Technology Research Institute
C C
C08F C09D
inventional inventional
Bang-Chein Sheng-Yueh Jian-Hong Ting-Chun Tzu-Yu
Ho Chang Chen Liu Lin