Melt transesterification process for the production of polycarbo

Details Melt transesterification process for the production of polycarbo Melt transesterification process for the production of polycarbo

1992-04-29

1993-06-22

Higel, Floyd D.

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

Organic compounds

Carbonate esters

544 35, 544 69, 544106, 544229, 546 13, 548110, 549 4, 558198, 558277, C08G 6362, C07C 6996, C07C 6802, C08F11800

Patent

active

052217612

ABSTRACT:
A melt transesterification process for the production of polycarbonates, wherein at least one bis(aryl)carbonate is reacted with at least one dihydric phenol in the melted state, in the presence of a transesterification catalyst comprising at least one heterocyclic borate salt of the formula:

REFERENCES:
patent: 3153008 (1964-10-01), Fox
patent: 3363586 (1976-06-01), Ginnasi et al.
patent: 3510507 (1970-05-01), Bown et al.
patent: 4218391 (1980-08-01), Romano et al.
patent: 4318862 (1982-03-01), Romano et al.
patent: 4330664 (1982-05-01), Brunelle
patent: 4410464 (1983-10-01), Hallgren
patent: 4554110 (1985-11-01), Mark
Article (pp. 457-467) "Studies in the Tetraarylborates" Part VII, The Preparation and Reagent Properties of Some New Nitrogen Heterocyclic Tetraarylboares--Especially Sodium Tetrakis (1-Imidazolyl) borate, A Novel Gravimetric Reagent for Hydrogen Ion by Chao and Moore (1978).

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