Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1977-05-19
1979-02-06
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
26032626, C08G 7310
Patent
active
041383923
ABSTRACT:
The present disclosure relates to a new composition of matter dibenzofuran-2,3,6,7,-tetracarboxylic acid dianhydride and polymers derived therefrom including polyamic acid or polyimide polymers formed from the reaction of the above dianhydride and a diamine. The claimed dianhydride finds use as an excellent cross-linking moiety. Condensation polymers derived from the dianhydride and diamines are useful in the production of films and fibers with good thermal stability.
REFERENCES:
patent: 2801250 (1957-07-01), Sullivan
patent: 3442861 (1969-05-01), Hoegger
patent: 3444184 (1969-05-01), Petropoulas et al.
patent: 3655691 (1972-04-01), Page
Fields Ellis K.
Puskas Imre
Clarke William C.
Gilkes Arthur G.
Lee Lester L.
McClain William T.
Standard Oil Company (Indiana)
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