Compositions – Compositions containing a single chemical reactant or plural... – Organic reactant
Patent
1991-02-08
1993-05-04
Miller, Edward A.
Compositions
Compositions containing a single chemical reactant or plural...
Organic reactant
560347, C09K 300, C07C26310
Patent
active
052079422
ABSTRACT:
Mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates (crude MDI) having a reduced iodine color number are prepared by reacting the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylene-polyamines with phosgene in the presence of one or more inert organic solvents at elevated temperatures by a process in which low molecular weight alkanols, polyhydric alcohols, preferably dihydric to octahydric alcohols having a molecular weight of from 60 to 350, or mixtures thereof are incorporated in an effective amount, advantageously in an amount of from 0.01 to 5% by weight, based on the weight of crude MDI, into the reaction mixture after the end of the phosgenation, the phosgene and the inert organic solvent are then separated off, from 0 to 5% by weight, based on the weight of crude MDI, of one or more phenol-based antioxidants and/or aryl phosphite are added to the reaction product, and the reaction mixture is subjected to a thermal treatment.
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Derek Williams Chemical Abstracts, vol. 64, abstract #64:6559a, of G.B. 1,014,043.
Bruchmann Bernd
Heider Wolfgang
Keller Peter
Langer Werner
Minges Roland
BASF - Aktiengesellschaft
Connaughton Martin P.
Miller Edward A.
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