Preparation of linear polycarbonates from cyclic oligomer compos

Details Preparation of linear polycarbonates from cyclic oligomer compos Preparation of linear polycarbonates from cyclic oligomer compos

1991-06-21

1992-04-07

Michl, Paul R.

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

Synthetic resins

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

523300, 524789, 264 23, C08J 0328

Patent

active

051029847

ABSTRACT:
Cyclic polycarbonate oligomers are polymerized by ultrasonic cavitation, either using a positive pressure of the ultrasonic probe or in combination with the action of at least one cyclic polycarbonate oligomer polymerization catalyst. Polymerization by this method may be effected on neat cyclic polycarbonate oligomers or on mixtures thereof with reinforcing agents such as glass fibers.

REFERENCES:
patent: 3862078 (1975-01-01), Burke, Jr.
patent: 4701538 (1987-10-01), Rosenquist et al.
patent: 4778875 (1988-10-01), Stewart
patent: 4933432 (1990-06-01), Yokoyama et al.

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