Biodegradable hydrophilic foams and method
AssigneeW. R. Grace & Co.
InventorsNelson Samuel Marans, Alan Ricky Pollack
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Abstract
The invention disclosed is directed to biodegradable hydrophilic polyurethane structures prepared by using an isocyanate capped hydroxyester polyol reactant with large amounts of aqueous reactant. The resultant foam has economy in handling, and upon contact with liquids or body fluids, the foam is highly absorptive while being readily biodegradable after use.
Claims6
A method of preparing biodegradable foam structures having three-dimensional networks, said method comprising, foaming a first component comprising isocyanate capped hydroxyester polyol having a reaction functionality of at least 2 with a second component comprising aqueous reactant wherein the H.sub.2 O Index Value is about 1,300 to 78,000, the hydroxyester linkages in said polyol formed by condensation of an aliphatic hydroxy carboxylic acid with the hydroxyl groups of (a) an essentially linear polyether, or (b) a monomeric low molecular weight aliphatic alcohol containing from 3 to 8 hydroxyl groups per mole.
Dependencies are inferred from the claim text.