Composition and method for controlling polymerization rate of cy

Details Composition and method for controlling polymerization rate of cy Composition and method for controlling polymerization rate of cy

1986-08-22

1988-07-05

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having a halogen atom or oxygen single bonded...

525436, 525439, 525463, 525534, 525535, 528196, C08G 6362

Patent

active

047555882

ABSTRACT:
The polymerization rate of a cyclic polycarbonate oligomer composition to linear polycarbonates is controlled by encapsulating a polycarbonate formation catalyst in a thermoplastic polymer which is soluble or stably dispersible in said oligomer compositions at elevated temperatures; blending the encapsulated catalyst with the oligomer composition under non-polymerization conditions; and heating the blend to a temperature at which polymerization takes place. Among the polymers suitable for encapsulating the catalyst are polyetherimides.

REFERENCES:
patent: 4605731 (1986-08-01), Evans et al.
patent: 4644053 (1987-02-01), Brunelle et al.

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