Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1990-12-03
1992-05-19
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528198, 528199, 528204, C08G 6428
Patent
active
051150816
ABSTRACT:
A process for producing a dichloroformate of a tetrahalogenated bisphenol by an interfacial process in a high yield and a high content and a process for producing an aromatic copolycarbonate oligomer by a solution process using the resulting dichloroformate monomer are disclosed. The first process comprises adding a catalyst for chloroformate formation to a tetrahalogenated bisphenol in an amount of from 1.times.10.sup.-4 to 1.times.10.sup.-1 mol per mol of the bisphenol and consecutively adding a halogenated carbonyl to effect reaction while controlling the pH of the reaction system between 10 and 12 by consecutive addition of a basic inorganic compound to the reaction system. The copolycarbonate oligomer obtained using the dichloroformate monomer has high alternating regularity.
REFERENCES:
patent: 3189640 (1965-06-01), Dietrich et al.
patent: 3255230 (1966-06-01), Kurkjy et al.
patent: 4501875 (1985-02-01), Mark
Encyclopedia of Polymer Science and Technology, vol. 10, pp. 716-721, 1969.
Anderson Harold D.
Mitsubishi Gas Chemical Co. Inc.
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