Method for making cyclic oligomeric aromatic polycarbonates from

Details Method for making cyclic oligomeric aromatic polycarbonates from Method for making cyclic oligomeric aromatic polycarbonates from

1990-09-24

1992-03-17

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...

528196, 528198, 528199, 528370, C08G 6426

Patent

active

050970097

ABSTRACT:
A method for making cyclic polycarbonate oligomers is provided by converting oligomeric monochloroformate carbonates to the cyclic state. Improvements in materials usage, process control, and product characteristics are obtained.

REFERENCES:
patent: 3193528 (1965-07-01), Miller et al.
patent: 4638077 (1987-01-01), Brunelle et al.
patent: 4644053 (1987-02-01), Brunelle et al.
patent: 4737573 (1988-04-01), Silva et al.
patent: 4814429 (1989-03-01), Silva

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