Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1982-02-01
1982-10-12
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528207, C08G 6306, C08G 6538
Patent
active
043540180
ABSTRACT:
A resinous linear polyester, poly(oxy-1,4-phenylene-3-oxotrimethylene), is made by the self-condensation of 3-(parahydroxyphenyl)propionic acid. The process is carried out interfacially or in an inert solvent by mixing 3-(parahydroxyphenyl)propionic acid with at least an equimolar proportion of thionyl chloride and maintaining the mixture at a reaction temperature for a time sufficient to allow substantially complete autocondensation. A base may be added in proportion at least about equivalent to the thionyl chloride. The autocondensate when purified is a white solid linear polyester not melting up to 360.degree. C. and may exhibit an intrinsic viscosity of at least 75 ml/g. It may be molded or pressed into a film.
Co-condensed polyesters of 3-(parahydroxyphenyl)propionic acid with up to an equimolar proportion of parahydroxyphenylacetic acid may similarly be prepared.
REFERENCES:
patent: 2600376 (1952-06-01), Caldwell
patent: 4230817 (1980-10-01), Charbonneau
Chem. Abstr. 55, 3589b (1961) LIX. Polyester, T. Kametani and K. Fukumoto.
Encyclopedia of Polymer Science & Technology, vol. 15, pp. 292-306, esp. pp. 292-294 and 306 (1971), Interscience Publ., New York; Authors: J. Economy & S. G. Cottis.
Makromol. Chem. 182, 681-686 (1981); Hans-G. Elias & Robert J. Warner, "Polyesters by Thionyl Chloride Activted Polycondensation".
Elias Hans-G.
Warner Robert J.
Lee Lester L.
Michigan Molecular Institute
Yates William Miller
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