PREPARATION OF LIGHT-COLORED ISOCYANATE

Japanese Patent JP2009149614

A

To provide a light-colored isocyanate as a raw material for a light-colored or uncolored polyisocyanate.

The method for producing the light-colored isocyanate is regulated as follows. The PRI (polarographically reducible impurity) value of a start amine is regulated so as to be 60 mpm (mol per million mol) in a reaction of the amine with phosgene in vapor phase. The reaction in a reaction zone is carried out at a temperature of 200C and 570C under an absolute pressure of 0.8-3 bar. The pressure in an amine- or phosgene-feeding line is regulated so as to be 20-2,000 mbar higher than the pressure in the reaction zone, and the pressure in a downstream zone of the reaction zone is regulated so as to be 10-500 mbar lower than the pressure in the reaction zone.

JP5380931	Method for Producing Methylene Crosslinked Polyphenyl Polyisocyanate
JPS56127341	NEW ALIPHATIC TRIISOCYANATE, ITS PREPARATION AND NONYELLOWING POLYURETHANE RESIN HARDENER COMPOSED THEREOF
WO/2007/028715	METHOD FOR PRODUCING ISOCYANATES

STUTZ HERBERT
HALPAAP REINHARD DR
LEWKEBANDARA TILAK SUREN

JP2008291120A

July 09, 2009

November 13, 2008

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BAYER MATERIALSCIENCE AG
BAYER MATERIALSCIENCE LLC

C07C263/10; C07C265/14

JPH0687815A	1994-03-29
JPH11240858A	1999-09-07
JP2007326857A	2007-12-20
JPH0687815A	1994-03-29
JPH11240858A	1999-09-07
JP2008503532A	2008-02-07
JPH05320297A	1993-12-03
JP2003503383A	2003-01-28
JP2008545745A	2008-12-18
JP2004513105A	2004-04-30
JP2006510692A	2006-03-30

US20070232827A1

2007-10-04

Mitsuo Tanaka
Takuji Yamada
Kenichi Morizumi
Yasuo Shibata
Yasushi Ochiai

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