Title:
規定の酸性度を有するジフェニルメタン系のジイソシアネート及びポリイソシアネートの製造
Document Type and Number:
Japanese Patent JP5162083
Kind Code:
B2
Abstract:
A method for the production of di- and poly-isocyanates of the diphenylmethane series involves making crude MDI by reaction of aniline and formaldehyde followed by phosgenation and distillation as usual, then determining the acidity of the fractions obtained and adjusting their acidity to the required level by treatment with an acid compound. A method for the production of di- and poly-isocyanates of the diphenylmethane series (I) involves (a) acid-catalysed reaction of aniline and formaldehyde to give di- and poly-amines, (b) phosgenation of the amines (optionally in solvent) to give crude di-/poly-isocyanate, (c) distillation to give a fraction containing at least 5 wt% tri- and poly-nuclear MDI and fraction(s) containing at least 95 wt% dinuclear MDI, (d) analytical determination of the acidities of these fractions and (e) addition of an acid compound to one or more of these fractions to obtained the required acidity.
Inventors:
Ulrich Lehman
Heinz-Herbert Muller
Robert Feeler
Ralph Echter Hof
Heinz-Herbert Muller
Robert Feeler
Ralph Echter Hof
Application Number:
JP2005029443A
Publication Date:
March 13, 2013
Filing Date:
February 04, 2005
Export Citation:
Assignee:
Bayer MaterialScience AG
International Classes:
C07C263/10; C07C263/20; C07C265/14; C08G18/02; C08G18/08; C08G18/76
Domestic Patent References:
| JP10158357A | ||||
| JP2003313155A | ||||
| JP5065264A | ||||
| JP2004529115A | ||||
| JP50101344A | ||||
| JP50157346A | ||||
| JP58090540A |
Attorney, Agent or Firm:
Einzel Felix-Reinhard
Takuya Kuno
Takuya Kuno