Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1992-05-05
1993-05-11
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528171, 528174, 528196, 528198, 528202, 528204, C08G 6424
Patent
active
052101738
ABSTRACT:
The invention relates to a method of preparing aromatic polycarbonates by catalytic interface polymerization of at least one bivalent phenol and a carbonyl halide in the presence of a polycondensation catalyst, which method is characterized in that the conversion is carried out in a two-phase system with continuous dosing of the carbonyl halide, which two-phase system is based on water and an organic solvent, in which the quantity of organic solvent at the beginning of the polycondensation lies between 10% and 75% of the quantity of organic solvent which is required at the polymerization temperature for dissolving the quantity of polycarbonate which may be formed from the quantity of bivalent phenol which is present at the beginning of the polycondensation, in that after dosing at least 20% of the carbonyl halide a remaining quantity of organic solvent is added which is at least sufficient to keep the formed polycarbonate in solution.
REFERENCES:
patent: 4368315 (1983-01-01), Sikdar
patent: 4384108 (1983-05-01), Campbell et al.
patent: 4529791 (1985-07-01), Glass
patent: 4558118 (1985-12-01), Sikdar
patent: 4789730 (1988-12-01), Priddy
Anderson Harold D.
General Electric Company
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