Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1980-10-02
1982-09-14
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528125, 528126, 528128, 528173, 528176, 528179, 528190, 528271, C08G 6302, C08G 1702
Patent
active
043496598
ABSTRACT:
In a process for producing an aromatic polyester by reacting under application of heat (A) an aromatic dicarboxylic acid and/or an ester-forming derivative thereof, (B) an aromatic hydroxycarboxylic acid and/or an ester-forming derivative thereof, and (C) a dihydroxy aromatic compound produced by the method of alkali fusion and containing 4,4'-dihydroxydiphenyl as major constituent and/or an ester-forming derivative of said dihydroxy aromatic compound, the improvement which comprises employing as said 4,4'-dihydroxydiphenyl, a 4,4'-dihydroxydiphenyl of such a quality that a solution of 1 part by weight of it dissolved in 100 parts by weight of a mixture comprising methanol and water in a weight ratio of 70:30 will show a pH of 6.6 to 7.4. The polyester produced by the improved process shows little discoloration and is excellent in thermal resistance and mechanical properties.
REFERENCES:
patent: 3637595 (1972-01-01), Cottis et al.
patent: 3884876 (1975-05-01), Cottis et al.
patent: 4247514 (1981-01-01), Luise
Hanabata Makoto
Kato Yasuyuki
Sugimoto Hiroaki
Foelak Morton
Sumitomo Chemical Company Limited
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