Cyclic polycarbonate oligomers: inhibition and control of polyme

Details Cyclic polycarbonate oligomers: inhibition and control of polyme Cyclic polycarbonate oligomers: inhibition and control of polyme

1988-07-11

1989-05-16

Garvin, Patrick P.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

502150, 502152, 502154, 502155, 502164, 502170, 502171, B01J 3114

Patent

active

048310018

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: 4605731 (1986-08-01), Evans et al.
patent: 4644053 (1987-02-01), Brunelle et al.
patent: 4675304 (1987-06-01), Evans et al.

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