Preparation of polycarbonate products

Details Preparation of polycarbonate products Preparation of polycarbonate products

1993-12-27

1994-09-20

Kight, III, John

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

Synthetic resins

From organic oxygen-containing reactant

528392, C08G 6534, C08G 6702

Patent

active

053490487

ABSTRACT:
The present invention provides a process for preparing urethanes and carbonates from an amine or an alcohol, carbon dioxide and a hydrocarbyl halide. The amine or alcohol is reacted with carbon dioxide in a suitable solvent system and in the presence of an amidine or guanidine base, to form the ammonium carbamate or carbonate salt which is then reacted in a polar aprotic solvent with a hydrocarbyl halide. Polymer products can also be prepared utilizing this process or utilizing the resulting urethanes and carbonates under standard polymerization conditions.

REFERENCES:
patent: 4467089 (1984-08-01), Bechara
patent: 5223638 (1993-06-01), McGhee et al.
Aresta, M. and Quaranta, E., "Role of the Macrocyclic Polyether in the Synthesis of N-Alkylcarbamate Esters from Primary Amines, CO.sub.2 and Alkyl Halides in the Presence of Crown-Ethers", Tetrahedron, 48, 1515-1530 (1992).
Yoshida, Y. et al., "Novel Synthesis of Carbamate Ester from Carbon Dioxide, Amines, and Alkyl Halide", Bull. Chem. Soc. (1989).
Hori, Y. et al., "New Organic Synthesis with DBU: Part 7. Synthesis of Carbonates and Carbamates with Carbon Dioxide Gas as the Starting Material", Chemistry Express, vol. 1, No. 4, pp. 224-227 (1986).

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