Title:
METHOD FOR PRODUCING VERY PURE 2,4'-METHYLENE DIPHENYL DIISOCYANATE
Document Type and Number:
Japanese Patent JP2005225879
Kind Code:
A
Abstract:
To produce a mixture of methylene diphenyl diisocyanate (MDI) isomers having a high 2,4'-MDI content, while being decreased in amounts of components, such as 2,2'-MDI, a residual solvent, and phenyl isocyanate, to such an extent as not to disturb production of a polyurethane.
In a method for producing a fraction of diphenylmethane-based diisocyanates, the fraction contains at least binuclear methylene diphenyl diisocyanates in an amount of at least 99 wt% based on a total amount of the fraction.
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Inventors:
PIRKL HANS-GEORG
BOLTON JEFFREY
MECKEL WALTER
WOLF ULRICH
WINTERMANTEL MATTHIAS
MAHRENHOLTZ JOCHEN
BOLTON JEFFREY
MECKEL WALTER
WOLF ULRICH
WINTERMANTEL MATTHIAS
MAHRENHOLTZ JOCHEN
Application Number:
JP2005029552A
Publication Date:
August 25, 2005
Filing Date:
February 04, 2005
Export Citation:
Assignee:
BAYER MATERIALSCIENCE AG
International Classes:
C07C263/10; C07C263/20; C07C265/14; C08G18/10; C08G18/12; C08G18/42; C08G18/48; C08G18/76; C09J175/04; (IPC1-7): C07C263/10; C07C263/20; C07C265/14; C08G18/42; C08G18/48
Domestic Patent References:
| JPS4948313A | 1974-05-10 | |||
| JPS5890540A | 1983-05-30 | |||
| JPS539750A | 1978-01-28 | |||
| JPH05163231A | 1993-06-29 | |||
| JPH0687814A | 1994-03-29 | |||
| JP2002502838A | 2002-01-29 |
Other References:
JPN6011050033; 社団法人 日本化学会編: 新実験化学講座１ 基本操作Ｉ 第３刷, 19780320, ｐ．４０４-４２５, 丸善株式会社
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel