Biodegradable polyurethanes
OwnerScott A. Guelcher, Jonathan E. Didier +1inventors
InventorsScott A. Guelcher, Jonathan E. Didier, Jeffrey O. Hollinger
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Abstract
A method for preparing biodegradable polyurethanes includes contacting a flowable quasi-pre-polymer 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.
Claims50
A method for preparing biodegradable polyurethanes comprising:
- contacting a flowable quasi-prepolymer comprising free aliphatic polyisocyanate compounds with a polyester polyol hardener having a functionality of at least two to form a reactive liquid mixture.
A quasi-prepolymer formed by contacting a polyisocyanate component comprising at least one aliphatic polyisocyanate compound with a polyol component comprising at least one polyol compound wherein an excess of the polyisocyanate component is used to result in free isocyanate component.
A quasi-prepolymer formed by contacting a polyisocyanate component comprising at least one aliphatic polyisocyanate compound with a polyol component comprising at least one polyol compound and subsequently adding polyisocyanate compounds to result in free isocyanate component.
A biodegradable polyurethane formed by contacting a flowable quasi-prepolymer comprising free aliphatic polyisocyanate compounds with a polyester polyol hardener having a functionality of at least two to form a reactive liquid mixture.
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Dependencies are inferred from the claim text.