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Title:
PRODUCTION OF POLYMETHYLENE POLYPHENYL POLYCARBAMATE
Document Type and Number:
Japanese Patent JPS56100820
Kind Code:
A
Abstract:

PURPOSE: To produce the titled compd. in high yields and in high selectivity, by a method wherein the reaction between an N-phenylcarbamate ester and formaldehyde is carried out in the presence of a solvent by using a ferric halide as a catalyst.

CONSTITUTION: In a process for producing a polymethylene polyphenyl polycarbamate of formula II (wherein R1 is 1W6C alkyl, cycloalkyl; R2 is H, halogen, 1W6C alkyl, alkoxy; n is 1W4; m is 0W5) comprising reacting an N-phenylcarbamate ester of formula I (wherein R1, R2, n are as defined above) with formaldehyde, the reaction is carried out in the presence of a solvent which is inert to formaldehyde, but can dissolve the starting materials and a product by using a ferric halide (e.g. ferric chloride or ferric bromide) as a catalyst in an amount of 0.01W10mol per mole of the carbamic acid ester and in an amount of not less than 0.1wt% based on the combined amount of whole reaction mixt. while removing water formed outside the process line.


Inventors:
MIYATA KATSUJI
HASEGAWA SEIJI
AOKI SHINOBU
HARA RETSU
Application Number:
JP1980000002568
Publication Date:
August 13, 1981
Filing Date:
January 16, 1980
Export Citation:
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Assignee:
MITSUI TOATSU CHEMICALS
International Classes:
C08G12/00; C07C67/00; C07C239/00; C07C269/00; C07C271/06; C08G12/04; C08G12/10; (IPC1-7): C07C125/06; C08G12/10



 
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