Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1994-05-25
1995-12-05
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 38, 556422, 556425, C08G 7726
Patent
active
054730414
ABSTRACT:
There is disclosed an organopolysiloxane having bifunctional biphenyl groups of the formula I ##STR1## 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 ##STR2## in which R.sup.1 is a divalent organic group having at least 2 carbon atoms, R.sup.2 through R.sup.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 ##STR3## wherein A.sup.1 is a tetravalent aromatic group, A.sup.3 is a divalent aromatic group and A.sup.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.
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Bleutge John C.
Dow Corning Corporation
Glass Margaret W.
Weitz Alexander
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