Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PRODUCTION OF POLYMETHYLENEPOLYPHENYLCARBAMATES
Document Type and Number:
Japanese Patent JPH051016
Kind Code:
A
Abstract:

PURPOSE: To obtain a polymethylenepolyphenylcarbamate having no cyclic structural unit in high purity and yield by subjecting a compound having a specific cyclic structure to ring-opening condensation reaction using an acid catalyst.

CONSTITUTION: A compound expressed by formula I (R is 1-6C alkyl, cycloalkyl or aryl) is subjected to ring-opening condensation reaction using an acid catalyst such as mineral acid, organic carboxylic acid, organic sulfonic acid, Lewis acid or heteropolyacid (preferably methanesulfonic acid or trifluoromethane sulfonic acid) at 20-150°C, preferably 50-120°C to provide the objective compound expressed by formula II ((n) is integer of ≥0). The compound expressed by formula I is obtained by e.g. reacting N-phenylcarbamate with formaldehyde in the presence of an acid catalyst and separating and recovering the compound from the resultant reactional products. Polymethylenepolyphenylcarbamates having a high isocyanate group content can be produced by pyrolytic reaction of the compound expressed by formula II. The resultant carbamate derivatives are useful in rigid foam field.


Inventors:
IKARIYA TAKAO
MIYAZAWA MAKOTO
YAMAMOTO SACHIKO
FUJIMURA KATSUNORI
HIGUCHI SHINYA
Application Number:
JP17983291A
Publication Date:
January 08, 1993
Filing Date:
July 19, 1991
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NIPPON KOKAN KK
International Classes:
B01J27/02; B01J27/10; B01J27/16; B01J31/02; B01J31/04; B01J31/10; C07B61/00; C07C263/04; C07C265/14; C07C269/06; C07C271/28; C07C271/38; C07C271/58; (IPC1-7): B01J27/02; B01J27/10; B01J27/16; B01J31/02; B01J31/04; B01J31/10; C07B61/00; C07C263/04; C07C265/14; C07C269/06; C07C271/28; C07C271/38; C07C271/58
Attorney, Agent or Firm:
Akira Uchida (2 outside)