Process for forming carbonates of hydroxyaromatic compounds

US6153696A · kind A · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Gregory Breyta · San Jose, US
• Daniel J. Dawson · Mountain View, US
• Moahmoud Mostafa Khojasteh · Wappingers Falls, US
• Ranee W. Kwong · Wappingers Falls, US
• Elwood Herbert Macy · Hughsonville, US
• David Paul Merritt · Cold Spring, US
• Wayne M. Moreau · Wappingers Falls, US
• Stanley E. Perreault · Wappingers Falls, US
• Harbans S. Sachdev · Wappingers Falls, US
• Robert L. Wood · Poughkeepsie, US
• Hiroshi Ito · Yokohama, JP

Key dates

• Filing date: May 10, 1993
• Grant date: Nov 28, 2000
• Expiry date: May 10, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F8/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the stoichiometric carbonation of a hydroxyaromatic material is provided which comprises the steps of (a) mixing together in a reaction vessel (1) a hydroxyaromatic material, (2) a sufficient amount of a dialkyl dicarbonate to give the desired degree of substitution, (3) a catalytic amount of an unhindered tertiary amine, and (4) a solvent, (b) stirring the reaction mixture, (c) precipitating the alkyl carbonate of the hydroxyaromatic material, and (d) recovering the alkyl carbonate of the hydroxyaromatic material.