Title:
PURIFICATION OF ISOCYANATE COMPOUND
Document Type and Number:
Japanese Patent JPH09323968
Kind Code:
A
Abstract:
To markedly reduce the concentration of hydrolyzable chlorine as an impurity in an isocyanate compound being in wide use as a raw material for coating materials, adhesives, molded products, etc.
A crude isocyanate compound containing hydrolyzable chlorine is treated with an epoxy compound in the presence of amine(s) to obtain the objective isocyanate compound reduced in the hydrolyzable chlorine content. In this case, the amine(s) is pref. at least one kind selected from among 4-15C trialkylamines, compounds of the formula, [H2N-(CH2CH2NH)n-H ((n) is an integer of ≥2)] and 2-(1-3)C alkyl-4-(1-3)C alkylimidazoles, and it is preferable that the amount(s) of the amine(s) to be used is 0.2-2 equivalent times that of the hydrolyzable chlorine.
Inventors:
MATSUHIRA SHINYA
TSUTSUMI TATSUNORI
MORIKAWA KOHEI
TSUTSUMI TATSUNORI
MORIKAWA KOHEI
Application Number:
JP14268196A
Publication Date:
December 16, 1997
Filing Date:
June 05, 1996
Export Citation:
Assignee:
SHOWA DENKO KK
International Classes:
C07C263/20; C07C265/04; C08G18/70; (IPC1-7): C07C265/04; C07C263/20
Attorney, Agent or Firm:
鈴木 俊一郎