Preparation of spirobiindane bisphenol bischloroformate composit

Details Preparation of spirobiindane bisphenol bischloroformate composit Preparation of spirobiindane bisphenol bischloroformate composit

1986-11-04

1991-02-19

Garner, Vivian

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

Organic compounds

Halocarbonate esters

558282, C07C 6802, C07C 6996

Patent

active

049945955

ABSTRACT:
Bischloroformate compositions are prepared from spirobiindane bisphenols by phosgenation in a substantially inert organic liquid in a two-step reaction. The pH during the first step is maintained in the range of about 8-14 by addition of aqueous base. In the second step, the pH is in the range of about 2-6. This method produces compositions containing a substantial amount of monomeric bischloroformate and avoids gelling problems.

REFERENCES:
patent: 4601858 (1986-07-01), Shannon et al.
patent: 4638077 (1987-01-01), Brunelle et al.

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