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

1989-02-22

1990-05-22

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...

528198, 528199, C08G 6362

Patent

active

049279114

ABSTRACT:
Cyclic polycarbonate oligomers are converted to linear polycarbonates by the catalytic action of a zwitterionic compound containing positively charged nitrogen and negatively charged oxygen. The polymerization reaction is slow, and therefore particularly useful in such operations as resin transfer molding.

REFERENCES:
patent: 4644053 (1989-02-01), Brunelle et al.
patent: 4707539 (1987-11-01), Mues et al.

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