Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1990-04-02
1991-11-19
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528125, 528126, 528220, 528229, 528351, 526262, C08G 6926, C08G 6928, C08G 802, C08F 2240
Patent
active
050667718
ABSTRACT:
A method for producing an imide oligomer soluble in an organic solvent by reacting three components of an aromatic tetracarboxylic acid or its derivative, an aromatic diamine and an end-capping agent, wherein the aromatic diamine is a condensation product of o-ethylamiline with formaldehyde, and the end-capping agent is an ethynyl phthalic acid of the formula: ##STR1## wherein R is a hydrogen atom or a monovalent group selected from the group consisting of an aliphatic group, an alicyclic group and an aromatic group, or its derivative.
REFERENCES:
patent: 3745149 (1973-07-01), Serafini et al.
patent: 3879349 (1975-04-01), Bilow et al.
Hino Seiichi
Koura Kouji
Satou Shoichi
Suzuki Osamu
Hampton-Hightower P.
Kight III John
Kozo Iizuka, Director-General of Agency of Industrial Science an
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