Orthopedic casting material having reduced tack and reduced slip
AssigneeCarapace, Inc.
InventorsMartin Edenbaum, Kurt C. Frisch, Aisa Sendijarevic, Shaio-wen Wong
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Abstract
Disclosed is an orthopedic casting material comprising a fabric coated or impregnated with a blend of polyisocyanate prepolymer and an effective detackifying quantity of one or more hydrophilic bisurethanes. In a preferred embodiment, the hydrophilic bisurethane is derived from the reaction of a polyethylene glycol having a molecular weight of about 4000 and methylene-4,4'- bis(phenylisocyanate) to form an isocyanate-terminated prepolymer which is then reacted with ethanol.
Claims17
An orthopedic casting material comprising a fabric coated or impregnated with a combination of a reactive fluid water-curable polyisocyanate prepolymer and an effective detackifying quantity of one or more hydrophilic bisurethanes selected from the group consisting of compounds of the formulas I and II:
- ##STR4## where Y is a hydrophilic polymeric chain having a molecular weight in the range of about 1000 to 8000;
- each X in formula I and each Z in formula II may be the same or different and is selected from aromatic, cycloaliphatic or aliphatic groups;
- and R is derived from monofunctional C1-C6 alcohols or from oxyalkylene adducts of monofunctional alcohols of the general formula IV:
- ##STR5## where q and m are independently 0 or a positive integer, provided that if one of q or m is 0, the other of q or m is a positive integer.
A prepolymer mixture for use in orthopedic casting materials comprising a polyisocyanate prepolymer and an effective detackifying quantity of one or more hydrophilic bisurethanes selected from the group consisting of compounds of formulas I and II:
- ##STR7## where Y is a hydrophilic polymeric chain having a molecular weight in the range of about 1000 to 8000;
- each X in formula I and each Z in formula II may be the same or different and is selected from aromatic, cycloaliphatic or aliphatic groups;
- and R is derived from monofunctional C1-C6 alcohols or from oxyalkylene adducts of monofunctional alcohols of the general formula IV:
- ##STR8## where q and m or independently 0 or a positive integer, provided that if one of q or m is 0, the other of q or m is a positive integer.
Dependencies are inferred from the claim text.