| 摘要 |
<p>There is disclosed an organopolysiloxane having bifunctional biphenyl groups of the formula I <CHEM> wherein Q is selected from the group consisting of a nitro group, a substituted amino group and an unsubstituted amino group, Z is an organopolysiloxane group represented by the formula II <CHEM> in which R<1> is a divalent organic group having at least 2 carbon atoms, R<2> through R<6> are the same or different monovalent organic groups, n is an integer having a value of at least 1 and m is 0 or 1. The above organopolysiloxane may be reacted with an aromatic tetracarboxylic acid dianhydride and, optionally, with an aromatic diamine to obtain a polyamide acid, which may then be subjected to a thermal imidization step to provide a polyimide having repeating units shown by the formulas VI and VII <CHEM> wherein A<1> is a tetravalent aromatic group, A<3> is a divalent aromatic group and A<2> is a divalent organic group which contains a siloxane residue and wherein the molar ratio of repeating unit VI to repeating unit VII in the range 100:0 to 1:99</p> |
