Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1979-08-27
1981-05-12
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
260463, 525439, 528173, 528176, 528179, 528180, 528181, 528182, 528199, 528200, 525462, C08G 6362, C08G 6364
Patent
active
042673038
ABSTRACT:
This disclosure is concerned with a single step process for the production of diphenol terminated polycarbonates by the transesterification of diphenols, bis-aryl carbonates and polymeric diols with aliphatically bound terminal hydroxyl groups. These diols are selected from polyesters, polyethers, polythioethers and polyacetals. The transesterification is carried out at elevated temperatures under vacuum optionally in the presence of a catalyst with the ratios of the reactants being such as to avoid the retention of any terminal aliphatic hydroxyl groups or aryl carbonate groups.
REFERENCES:
patent: 3030335 (1962-04-01), Goldberg
patent: 3161615 (1964-12-01), Goldberg
patent: 3287442 (1966-11-01), Caldwell et al.
patent: 3290409 (1966-12-01), Munro
patent: 3641200 (1972-02-01), Matzner
patent: 3843708 (1974-10-01), Matzner
patent: 3998908 (1976-12-01), Lindenfels
Merrill, J.P.S. vol. 55, Block Copolymers Based on 2,2-bis-(4-hydroxyphenyl)-Propane Polycarbonate, pp. 343-352, (1961).
Goldberg, J.P.S. Part C, No. 4, pp. 707-730, Elastomeric Polycarbonate Block Copolymers, 1963.
Freitag Dieter
Konig Klaus
Lindner Christian
Schreckenberg Manfred
Suling Carlhans
Bayer Aktiengesellschaft
Harsh Gene
Lee Lester L.
Pope Lawrence S.
Preis Aron
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