Cycle polycarbonate oligomers: inhibition and control of polymer

Details Cycle polycarbonate oligomers: inhibition and control of polymer Cycle polycarbonate oligomers: inhibition and control of polymer

1986-10-30

1988-05-24

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, 528370, C08G 6362

Patent

active

047467266

ABSTRACT:
Lewis acids such as triphenyl borate, triphenylborane and aluminum isopropoxide are employed to inhibit or control 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 Lewis acids can act as reaction rate accelerators or inhibitors depending on reaction parameters.

REFERENCES:
patent: 3155683 (1964-11-01), Moody
patent: 3386954 (1968-06-01), Schnell et al.
patent: 4605731 (1986-08-01), Evans et al.
patent: 4644053 (1987-02-01), Brunelle et al.

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