Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1995-02-09
1996-05-14
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
502150, 502152, 502157, 502158, 502171, 502200, 564281, 528196, 528198, 528200, C08G 6400
Patent
active
055168787
ABSTRACT:
A process for the production of an aromatic polycarbonate, which comprises polycondensing an aromatic dihydroxy compound and a diaryl carbonate in the presence, as a polycondensation catalyst, of at least one alkali metal salt selected from the group consisting of alkali metal salts of ate-complexes of a metal element, which is silicon, germanium, stannum or plumbum, and alkali metal salts of oxoacids of said metal elements. The above aromatic polycarbonate is almost free from being colored, is also almost free from a decrease in polymerization degree when molded, and is further almost free from forming branches and insolubles.
REFERENCES:
patent: 3689462 (1972-09-01), Maximovich
patent: 4330665 (1982-05-01), Krimm et al.
patent: 4382014 (1983-05-01), Sakai et al.
Abstract of JP-62199618, Daicel Chem Ind KK, "Preparation of Polyester Carbonbate Used in Plastic Engineering", Feb. 27, 1986.
Abstract of JP-54063023, Mitsubishi Chem Ind KK, "Ester-exchanged Carbonate Production by Reacting in the Presence of a Tin Alkoxide", Oct. 26, 1977.
Abe Masanori
Funakoshi Wataru
Hirata Masumi
Kaneko Hiroaki
Sasaki Katsushi
Mosley Terressa
Seidleck James J.
Teijin Limited
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