Extruder polymerization of polyurethanes

Details Extruder polymerization of polyurethanes Extruder polymerization of polyurethanes

C - Chemistry, Metallurgy

08

G

402/144

C08G 18/67 (2006.01) C08G 18/08 (2006.01)

Patent

CA 1308851

FN: 43700CAN1A EXTRUDER POLYMERIZATION OF POLYURETHANES ABSTRACT OF THE DISCLOSURE Bulk polymerization process for making radiation curable polyurethanes which comprises: A) providing the following raw materials: 1) diisocyanate; 2) oligomeric diol ? 400 molecular weight; and 3) ? 1 chain extending monomer; B) reacting the raw materials in a twin screw extruder under the following conditions: 1) molar ratio of isocyanate to hydroxy moieties of about 1; 2) ratio of chain extending monomer to other monomers sufficient to yield a polymer having chain extender incorporated at 0.1 to 10 weight percent; 3) extruder temperature sufficient to initiate and maintain reaction; and 4) residence time sufficient to obtain substantially complete reaction of diisocyanate; C) cooling product polymer. Polyurethane product has weight average molecular weight greater than 80,000 and acrylate or methacrylate functionality. Process permits continuous production of radiation curable polyurethanes having narrow molecular weight distribution and high tensile strength.

612067

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