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专利名称：Process for the preparation of mixtures of
diphenylmethane diisocyanates andpolyphenylpolymethylene polyisocyanateswith a reduced iodic colorimetric measure
发明人：SCHERZER, DIETRICH, DR.,MINGES, ROLAND,
DR.,BRUCHMANN, BERND, DR.,HEIDER,WOLFGANG,VAN PEE, WILLY, DR.,KELLER,PETER, DR.
申请号：EP91110635.9申请日：19910627公开号：EP0467125A1公开日：19920122
摘要：The invention relates to a process for the preparation of mixtures of
diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates (crudeMDI) having a reduced iodine colour value by reacting the corresponding mixtures ofdiphenylmethanediamines and polyphenylpolymethylenepolyamines with phosgene inthe presence of at least one inert organic solvent at an elevated temperature, wherein,after the end of the phosgenation, at least one monohydric or polyhydric
polyoxyalkylene alcohol, preferably having a functionality of 2 to 3, and advantageouslyhaving a hydroxyl number of 20 to 1,800, or a mixture thereof is incorporated into thereaction mixture in an effective amount, advantageously in an amount of 0.1 to 10% byweight, based on the weight of the crude MDI, the phosgene and the inert organicsolvent are then separated off, optionally up to 5% by weight, based on the weight of
the crude MDI, of at least one phenol-based antioxidant and/or aryl phosphite are addedto the reaction product and the reaction mixture is subjected to a thermal treatment.
申请人：BASF AKTIENGESELLSCHAFT
地址：CARL-BOSCH-STRASSE 38; W-6700 LUDWIGSHAFEN,Carl-Bosch-Strasse 38 D-67063 Ludwigshafen DE
国籍：DE
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