公开(公告)号：DE4203918A1

公开(公告)日：1993-08-12

申请号：DE4203918

申请日：1992-02-11

Applicant: BASF AG

Inventor： LUTTER HEINZ-DIETER DR ,  BRUCHMANN BERND DR ,  SPANG CLAUDIA DR ,  MINGES ROLAND DR ,  SCHERZER DIETRICH DR ,  LUGMAYR MICHAEL ,  ZSCHIESCHE RUTH DR

IPC: C08G18/10 ,  C08G18/12 ,  C08G18/40 ,  C08G18/48 ,  C08G18/65 ,  C08G18/72 ,  C08G18/76 ,  C08G101/00 ,  C08J9/02

Abstract: The invention relates to a process for the preparation of CFC-free flexible polyurethane(moulded) foams by reacting A) liquid polyisocyanate mixtures containing bonded urethane groups and containing from 20 to 30% by weight of NCO groups, themselves prepared by reacting a mixture of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanates (crude MDI) with a polyether-polyol mixture having a hydroxyl number of from 120 to 25 comprising at least one polyoxypropylene glycol and at least one trifunctional polyoxypropylene polyoxyethylene polyol containing from 90 to 10% by weight of ethylene oxide units or by reacting 4,4'-diphenylmethane diisocyanate (MDI) or an MDI isomer mixture with said polyether polyol mixture to give an NCO-containing quasi-prepolymer, and diluting this quasi-prepolymer with crude MDI, with B) relatively high-molecular-weight polyhydroxyl compounds and optionally C) low-molecular-weight chain extenders and/or crosslinking agents, in the presence of D) blowing agents E) catalysts and optionally F) auxiliaries and/or additives, and to the urethane group-modified polyisocyanate mixtures (A) which can be used according to the invention.

公开(公告)号：DE4006976A1

公开(公告)日：1991-09-12

申请号：DE4006976

申请日：1990-03-06

Applicant: BASF AG

Inventor： SCHERZER DIETRICH DR ,  MINGES ROLAND DR ,  LANGER WERNER DR ,  BRUCHMANN BERND DR ,  HEIDER WOLFGANG ,  KELLER PETER DR ,  SCHMITT ARNOLD ,  VAN PEE WILLY DR

IPC: C07C263/18 ,  C07C263/20 ,  C07C265/14

Abstract: The invention relates to a process for the preparation of mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates (crude MDI) having a reduced iodine colour value by reaction of corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylenepolyamines with phosgene in the presence of at least one inert organic solvent at elevated temperature, in which, after phosgenation of the reaction mixture is complete, low-molecular-weight alkanols, polyhydric alcohols, preferably di- to octahydric alcohols having a molecular weight of 60 to 350, or mixtures thereof are incorporated in an effective amount, advantageously in an amount of 0.01 to 5% by weight, relative to the crude MDI weight, the phosgene and the inert organic solvent are then separated off, 0 to 5% by weight, relative to the crude MDI weight, of at least one phenol-based antioxidant and/or aryl phosphite are added to the reaction product, and the reaction mixture is subjected to a heat treatment.