Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1978-01-16
1980-04-01
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
525146, 525148, 528196, 528205, C08G 6324, C08G 6364
Patent
active
041962761
ABSTRACT:
High-molecular weight polycarbonate elastomers are produced by reacting polymer segments having an average molecular weight (Mn) of more than 600 and carboxyl groups with diphenols and phosgene according to the two-phase boundary polycondensation process at a pH value between about 9 and about 14 and a temperature between about 0.degree. C. and 80.degree. C. and, thereafter, either heat-treating the resulting reaction products at temperatures between about 40.degree. C. and about 100.degree. C. or gelling the resulting reaction products in solution in organic solvents.
REFERENCES:
patent: 3367993 (1968-02-01), Caldwell et al.
patent: 3419635 (1968-12-01), Vaughn
patent: 3461187 (1969-08-01), Cantrill
patent: 3641200 (1972-02-01), Matzner
patent: 3843708 (1974-10-01), Matzner
patent: 4001184 (1977-01-01), Scott
Goldberg, E. P.; "Elastomeric Polycarbonate Block Copolymers," Journal of Polymer Science: Part C, vol. 55, No. 4, pp. 707-730.
Freitag Dieter
Konig Klaus
Schreckenberg Manfred
Serini Volker
Bayer Aktiengesellschaft
Briggs Sr. Wilbert J.
Harsh Gene
Pope Lawrence S.
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