Biodegradable polyurethanes

Details Biodegradable polyurethanes Biodegradable polyurethanes

C - Chemistry, Metallurgy

08

G

C08G 18/10 (2006.01) A61L 27/18 (2006.01) C08G 18/75 (2006.01)

Patent

CA 2650320

A method for preparing biodegradable polyurethanes includes contacting a flowable quasi-prepolymer including free aliphatic polyisocyanate compounds with a polyester polyol hardener having a functionality of at least two to form a reactive liquid mixture. The quasi-prepolymer can, for example, be formed by contacting a polyisocyanate component comprising at least one aliphatic polyisocyanate compound with a polyol component comprising at least one polyol compound to form an adduct of the polyisocyanate component and the polyol component wherein a sufficient excess of the polyisocyanate component is used to form the quasi-prepolymer.

Procédé servant à préparer des polyuréthanes biodégradables consistant à mettre en contact un quasi-prépolymère fluide comprenant des composés polyisocyanates aliphatiques libres avec un durcisseur de type polyester de polyol ayant une fonctionnalité d'au moins deux pour former un mélange liquide réactif. Le quasi-prépolymère peut, par exemple, être formé en mettant en contact un composant polyisocyanate comprenant au moins un composé polyisocyanate aliphatique avec un composant polyol comprenant au moins un composé polyol pour former un produit d'addition du composant polyisocyanate et du composant polyol, un excès suffisant du composant polyisocyanate étant utilisé pour former le quasi-prépolymère.

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