Process for the preparation of diphenylmethane dicarbamates and

Details Process for the preparation of diphenylmethane dicarbamates and Process for the preparation of diphenylmethane dicarbamates and

1981-02-25

1985-09-24

Shippen, Michael L.

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

Organic compounds

Carboxylic acid esters

C07C125073

Patent

active

045434190

ABSTRACT:
Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the acid catalyzed condensation of an N-aryl carbamic acid ester, such as ethylphenylcarbamate, with a carbonyl compound, such as formaldehyde, at a reaction temperature of from about 30.degree. C. to 170.degree. C. while removing any water added with the reactants and the water of condensation formed in the reaction, by azeotropic distillation with an azeotroping solvent which is non-reactive with the reactants and products of the condensation and which form a binary minimum-boiling azeotrope with water within the condensation, temperature range at atmospheric, sub-atmospheric or super-atmospheric pressure.

REFERENCES:
patent: T994004 (1980-05-01), Shawl
patent: 3277098 (1966-10-01), Merten
patent: 4162362 (1979-07-01), Shawl
Braun, "Techniques of Polymer Synthesis and Characterization," pp. 197-202, 220-224 (1971).
Sokolov, "Synthesis of Polymers by Polycondensation," Daniel Davey & Co., pp. 27, 28, 34, 57-71 & 77-86 (1968).
Collins, "Experiments in Polymer Science," John Wiley & Sons, pp. 3-6 & 66 (1973).

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