4,4′-メチレンジフェニルジイソシアネートおよび2,4′-メチレンジフェニルジイソシアネートの高い含有率を有するジフェニルメタン系列のジイソシアネートおよびポリイソシアネートの混合物の製造

Title:

Document Type and Number:

Japanese Patent JP4567390

Kind Code:

B2

Abstract:

A fraction of diisocyanates of the diphenylmethane series is produced by reacting aniline and formaldehyde in the presence of an acid catalyst; phosgenating diamines and polyamines of diphenylmethane series containing binuclear methylenediphenyl diamine to produce a crude diisocyanate and polyisocyanate; and separating from crude diisocyanate and polyisocyanate, a fraction containing >=95 wt.% binuclear methylenediphenyl diisocyanate. Production of a fraction of diisocyanates of the diphenylmethane series containing >=95 wt.% binuclear methylenediphenyl diisocyanate by: (1) reacting aniline and formaldehyde in the presence of an acid catalyst to produce diamines and polyamines of the diphenylmethane series containing binuclear methylenediphenyl diamine; (2) phosgenating the diamines and polyamines of the diphenylmethane series containing binuclear methylenediphenyl diamine to produce a crude diisocyanate and polyisocyanate; and (3) separating from the crude diisocyanate and polyisocyanate, a fraction containing >=95 wt.% binuclear methylenediphenyl diisocyanate comprising greater than 60 wt.% 4,4'-methyl diisocyanate (MDI), 4-35 wt.% 2,4'-MDI, 0.01-10 wt.% 2,2'-MDI relative to the mass of the fraction; and not >20 ppm phenyl isocyanate in a single distillation step. Independent claims are also included for: (1) production of a diphenylmethane diisocyanate mixture comprising blending the separated fraction with a mixture containing an aromatic isocyanate; and (2) production of a polymer comprising reacting the separated fraction and/or the blend of separated fraction with a mixture containing an aromatic isocyanate with a polyol.

More Like This:

JP4167177	Method for producing isocyanate in gas phase
JP5366580	Isocyanate production method
JP6523856	Method for producing pentamethylene diisocyanate and equipment for producing pentamethylene diisocyanate

Inventors:

Hans-Georg Pilkur
Ulrich Lehman
Robert Feeler
Ralph Echter Hof

Application Number:

JP2004214282A

Publication Date:

October 20, 2010

Filing Date:

July 22, 2004

Export Citation:

Click for automatic bibliography generation Help

Assignee:

Bayer MaterialScience AG

International Classes:

C07C263/10; C07C263/20; C07C265/14; C08G18/76

Domestic Patent References:

JP2002502838A
JP54000906B1

Attorney, Agent or Firm:

Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel

Previous Patent: 泡立具

Next Patent: モジュール間通信装置および方法