Precision polyurethane manufacture

B - Operations – Transporting – 29 – C

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Details

B29C 67/24 (2006.01) B29C 47/10 (2006.01) B29C 47/92 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2417899

A process for making a polyurethane, comprising reacting a multifunctional isocyanate, a polyol and, optionally, a chain extender, wherein at least two reagents selected from the isocyanate, the polyol, the chain extender, any mixture thereof and any pre-polymer formed therefrom, are intensively mixed prior to being reactively extruded, to form a polyurethane having a predetermined stoichiometry and thermal history. The polyurethanes obtained by such a process are of highly consistent composition and are, thus, especially suitable for use in the medical device industry.

L'invention concerne un procédé d'obtention d'un polyuréthanne consistant à faire réagir un isocyanate multifonctionnel, un polyol et, éventuellement, un allongeur de chaîne, au moins deux réactifs sélectionnés parmi l'isocyanate, le polyol, l'allongeur de chaîne, tout mélange de ces composés et tout pré-polymère formé à partir de ces composés étant fortement mélangés avant d'être extrudés par réaction, pour former un polyuréthanne ayant une stoechiométrie et un historique thermique prédéterminés. Les polyuréthannes obtenus par ce procédé sont d'une composition fortement consistante et sont, de ce fait, particulièrement adaptés pour être utilisés dans l'industrie des dispositifs médicaux.

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