Oligomeric carbonate chainstoppers

Details Oligomeric carbonate chainstoppers Oligomeric carbonate chainstoppers

1988-02-29

1991-02-19

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

25218231, 528196, 528199, 528202, 528203, 528204, 528371, 528372, 558269, 558271, 558272, 558274, C07C 6996

Patent

active

049945947

ABSTRACT:
Oligomeric carbonate dihydroxyaromatic-based chainstoppers are disclosed. One example of this type of chainstopper is a bisphenol A bischloroformate oligomer monocapped with phenol. These chainstoppers may be prepared by phosgenating a dihydroxyaromatic compound to terminate one or both of the terminal oxygen atoms with chlorocarbonyl groups, followed by reaction of the chlorocarbonyl-terminated material with a phenolic-type compound in the presence of an amine catalyst. The chainstoppers of the present invention are very useful in accurately controlling the molecular weight of polycarbonates formed by various processes, while also preventing the formation of undesirable by-products, such as diarylcarbonates.

REFERENCES:
patent: 3028365 (1962-04-01), Schnell et al.
patent: 3549682 (1970-12-01), Vernaleken
patent: 4089888 (1978-05-01), Tokumitsu et al.
patent: 4122112 (1978-10-01), Koda et al.
patent: 4247475 (1981-01-01), Ching
patent: 4616077 (1986-10-01), Silva
patent: 4638077 (1987-01-01), Brunelle et al.
patent: 4701544 (1987-10-01), Silva

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