Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1990-11-09
1992-02-11
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528125, 528128, 528172, C08G 7310
Patent
active
050876899
ABSTRACT:
Polyimide having repeating units of the following formula (I) and its polyamic acid precursor having repeating units of the following formula (II) are disclosed; ##STR1## (where Y is a radical selected from the group consisting of a bond, divalent hydrocarbon having 1 to 10 carbons, hexafluorinated isopropylidene, carbonyl, thio, sulfinyl, sulfonyl and oxide, and R is a tetra-valent radical selected from the group consisting of aliphatic radical having 2 and more carbons, cyclo-aliphatic radical, monoaromatic radical, condensed polyaromatic radical, and noncondensed polyaromatic radical wherein aromatic radicals are mutually connected with a bond or a crosslinking function).
Typical examples of polyimide and polyamic acid include where Y is thio radical and R is ##STR2## Y is a bond and R is III or IV, and Y is isopropylidene radical and R is IV.
The polymers can be prepared from corresponding diamine and tetracarboxylic acid dianhydride.
Polyimide or polyamic acid of this invention is excellent for high-temperature adhesive.
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Kawashima Saburo
Ohkoshi Kouji
Ohta Masahiro
Oikawa Hideaki
Sonobe Yoshiho
Kight III John
Krass Frederick
Mitsui Toatsu Chemicals Inc.
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