Cyclic polycarbonate oligomers: inhibition of polymerization to

Details Cyclic polycarbonate oligomers: inhibition of polymerization to Cyclic polycarbonate oligomers: inhibition of polymerization to

1987-08-14

1989-06-13

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...

528371, C08G 6362

Patent

active

048394629

ABSTRACT:
Substituted phenols and phenyl carbonates derived therefrom, such as 2,4-dinitrophenol and 2,4-dinitrophenyl carbonate, are employed to inhibit the formation of linear polycarbonates from cyclic polycarbonate oligomers. Inhibition of polymerization initiated by impurities in the cyclics is noted. When polymerization is effected by basic polycarbonate formation catalysts, the phenols or phenyl carbonates decrease reaction rate.

REFERENCES:
patent: 3475373 (1969-10-01), Jackson et al.
Hackh's Chemical Dictionary, Fourth Edition, pp. 47, 340, 646.

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