Apparatus and process for dispersing isocyanate terminated...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 3/02 (2006.01) B01F 3/08 (2006.01) B01F 5/00 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01)

Patent

CA 2203880

An apparatus and process for the preparation of water-based polyurethane-urea polymers wherein dynamic mixers, which have a pitched blade turbine within a draft tube to generate axial flow, are used to disperse isocyanate-terminated polyurethane prepolymers in water. The mixers are configured to provide an average residence time of at least about 10 seconds, an average energy per unit volume input less than about 0.60 watts per cubic centimeter and an average of at least about 5 passes through the mixing zone.

La présente invention concerne un équipement et un procédé destinés à la préparation de polymères de polyuréthanne-urée à base d'eau. Des malaxeurs dynamiques, qui comportent une turbine à aubes inclinées à l'intérieur d'un tube d'aspiration pour engendrer un courant axial, sont utilisés pour disperser dans l'eau des prépolymères de polyuréthanne se terminant par un isocyanate. Les malaxeurs sont configurés de telle manière qu'ils donnent un temps de séjour moyen d'au moins environ 10 secondes, une énergie moyenne par volume unitaire inférieure à environ 0,60 watt par centimètre cube et une moyenne d'au moins environ cinq passages par la zone de malaxage.

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