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

1990-06-07

1992-02-11

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...

524611, 524612, 528196, 528198, 528200, 528370, C08G 6438

Patent

active

050876929

ABSTRACT:
Cyclic polycarbonate oligomers are converted to linear polycarbonates by the catalytic action of a monobasic metal salicylate. The polymerization reaction takes place only at relatively high temperatures, typically above about 220.degree. C., and rapidly only at temperatures above about 250.degree. C., and is therefore particularly useful in such operations as resin transfer molding. The catalyst may be coated on a fibrous reinforcing material used for composite formation.

REFERENCES:
patent: 4778875 (1988-10-01), Stewart

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