Quaternary bisphenolates, methods for their preparation, and use

Details Quaternary bisphenolates, methods for their preparation, and use Quaternary bisphenolates, methods for their preparation, and use

1997-12-15

1999-10-19

Mosley, Terressa

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528271, C08G 6400

Patent

active

059690860

ABSTRACT:
Quaternary salts having a double helix structure are prepared by the reaction of dihydroxyaromatic compound, preferably a bisphenol, with an alkali metal hydroxide and a quaternary salt, such as a tetraalkylammonium or hexaalkylguanidinium chloride. The quaternary salts and their alkaline hydrolysis products are useful as catalysts in various reactions, including imide formation from bisphenol salts and halo- or nitro-substituted phthalimides and redistribution and equilibration of polycarbonates.

REFERENCES:
patent: 3284407 (1966-11-01), Winfield et al.
patent: 4022698 (1977-05-01), Jenkner
patent: 4340761 (1982-07-01), Doorakian et al.
patent: 4395574 (1983-07-01), Doorakian et al.
patent: 5152807 (1992-10-01), Sexton et al.
patent: 5514813 (1996-05-01), Brunelle

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