IMPROVED PROCESS FOR PRODUCTION OF CARBODIIMIDE-MODIFIED ORGANIC ISOCYANATE

Title:

IMPROVED PROCESS FOR PRODUCTION OF CARBODIIMIDE-MODIFIED ORGANIC ISOCYANATE

Document Type and Number:

Japanese Patent JP2006002153

Kind Code:

A

Abstract:

To provide an improved process for production of carbodiimide-modified organic isocyanate, preferably a polymethylenepolyphenyl isocyanate, and most preferably diphenylmethane diisocyanate.

This process comprises (1) neutralizing acidic impurities in an organic isocyanate with an acid scavenger, (2) partially carbodiimidizing isocyanate groups of the neutralized organic isocyanate with a catalyst of a phosphorus oxide type, and (3) terminating the carbodiimidization reaction by adding an acid. As the process for production uses little catalyst, so the required anticatalyst is little.

Inventors:

ROSTHAUSER JAMES W
GARRETT JAMES T
BOLTON JEFFREY S

Application Number:

JP2005174052A

Publication Date:

January 05, 2006

Filing Date:

June 14, 2005

Export Citation:

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Assignee:

BAYER MATERIALSCIENCE LLC

International Classes:

C08G18/02; C07C263/20; C07C267/00; C07D229/00; C08G18/08; C08G18/10; C08G18/76; C08G18/79; C07C265/14

Domestic Patent References:

JPS51122023A

1976-10-25

Attorney, Agent or Firm:

Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard

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