Title:
METHOD FOR MANUFACTURING METHYLENE CROSS-LINKED POLYPHENYL POLYISOCYANATES
Document Type and Number:
WIPO Patent Application WO/2010/007836
Kind Code:
A1
Abstract:
Provided is a manufacturing method for methylene cross-linked polyphenyl polyisocyanates with good hue-improving effects.
The manufacturing method for methylene cross-linked polyphenyl polyisocyanates is provided with a phosgenation reaction process wherein polymethylene polyphenyl polyamine and phosgene are reacted at 50°C to 100°C, and a removal process wherein residual phosgene is removed at 50°C to 100°C from the reaction solution obtained in the phosgenation process. Good hue-improving effects are thereby obtained without the introduction of hydrogen chloride to the reaction solution.
Inventors:
KAIKAWA TAKESHI (JP)
MIYAMOTO SHINICHI (JP)
MIYAMOTO SHINICHI (JP)
Application Number:
PCT/JP2009/060042
Publication Date:
January 21, 2010
Filing Date:
June 02, 2009
Export Citation:
Assignee:
NIPPON POLYURETHANE KOGYO KK (JP)
KAIKAWA TAKESHI (JP)
MIYAMOTO SHINICHI (JP)
KAIKAWA TAKESHI (JP)
MIYAMOTO SHINICHI (JP)
International Classes:
C07C263/10; C07C265/14
Foreign References:
| JPH07316122A | 1995-12-05 | |||
| JPH06234724A | 1994-08-23 |
Attorney, Agent or Firm:
KAJI, Yoshiyuki et al. (JP)
梶 Yoshiyuki (JP)
梶 Yoshiyuki (JP)
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