Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1993-05-10
2000-11-28
Gorr, Rachel
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
558270, 558271, 5253288, 525383, 525480, 4302701, C08F 800
Patent
active
061536962
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.
REFERENCES:
patent: 4491628 (1985-01-01), Ito et al.
patent: 4552833 (1985-11-01), Ito et al.
patent: 4613398 (1986-09-01), Chiong et al.
patent: 4931379 (1990-06-01), Brunsvold
H. Ito; Solid State Thermolysis of BTBOC Catalyzed by Phenol; Jrnl Polymer Science, Polymer Chemistry; vol. 24, (1986), pp. 2971-2980.
F. Houlihan, et al. "Phase Transfer Catalysis in the tert-Butyloxycarbonylation of Alcohols, Phenols, Enols, and Thiols with di-tert-Butyl Dicarbonate", Can. J. Chem., 63, 153 (1985).
Breyta Gregory
Dawson Daniel Joseph
Ito Hiroshi
Khojasteh Moahmoud Mostafa
Kwong Ranee Wai-Ling
Capella Steven
Gorr Rachel
International Business Machines - Corporation
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