Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1987-01-23
1990-09-25
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528128, 528172, 528185, 528353, C08G 802, C08G 1400
Patent
active
049594400
ABSTRACT:
This invention relates to a novel polyimide and describes method of its preparation, adhesives of the polyimide and the method for their application.
The polyimide has recurring units of the formula ##STR1## (where the positions of two carbonyl radicals in a benzene ring are meta or para, and R is a tetra-valent radical selected from the group consisting of aliphatic radical having not less than two carbons, cyclo-aliphatic radical, monoaromatic radical, condensed polyaromatic radical, and non condensed polyaromatic radical wherein aromatic radicals are mutually connected with a bond or a crosslinking function).
The polyimide can be prepared by reacting diamine with tetracarboxylic dianhydride in organic solvents and imidizing resultant polyamic acid.
The diamine in use is ether diamine and includes 1,3-bis[4-(3-aminophenoxy)benzoyl]benzene and 1,4-bis[4-(3-aminophenoxy)benzoyl]benzene.
Various tetracarboxylic dianhydrides can be used and particularly prefered are pyromellitic dianhydride and 3,3',4,4'-benzophenonetetracarboxylic dianhydride.
REFERENCES:
patent: 3502762 (1970-03-01), Haller
patent: 4316844 (1982-02-01), Waitkus et al.
patent: 4820791 (1989-04-01), Horgenrother et al.
Polyimide Structure-Property Relationships, 111, Polymides from Multi-Ring Diamines; Tsell et al.
Journal of Applied Polymer Science, vol. 26, 3805-3817.
Kawashima Saburo
Ohta Masahiro
Oikawa Hideaki
Sonobe Yoshiho
Tamai Shoji
Foelak Morton
Hampton Hightower P.
Mitsui Toatsu Chemicals Inc.
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