Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1983-09-26
1985-01-29
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
526266, 528 26, 528 28, 528126, 528128, 528172, 528179, 528182, 528185, 528188, 528208, 528351, 528352, 528353, 549297, 549298, 549299, 549300, 549303, 549320, C08G 7310
Patent
active
044967110
ABSTRACT:
Processes for forming a class of relatively low molecular-weight oligomers containing at least one isoimide group and terminal groups capable of undergoing an addition polymerization reaction are provided. These oligomers are characterized by excellent solubility in common solvents and a melting temperature considerably lower than their cure temperature, thus enabling the oligomers to be formed into cured polymers more slowly and at lower temperatures, all without the evolution of deleterious gases. The process for forming these oligomers includes the formation of a polyamic acid and dehydration thereof under specified conditions to effect cyclization of the polyamic acid to form the isoimide-containing oligomer, without the formation of undesired side-reaction products.
REFERENCES:
patent: 3261811 (1966-07-01), Tatum
patent: 3271366 (1966-09-01), Kreuz
patent: 3282898 (1966-11-01), Angelo
patent: 3316212 (1967-04-01), Angelo
patent: 3413267 (1968-11-01), Kreuz
Hughes Aircraft Company
Karambelas A. W.
Lachman M. E.
Lee Lester L.
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