Patent ID: 6359100
Filing Date: 2002-03-19
Classification: C08G,Y10S

Abstract:
A method of preparing a pressure sensitive polyurethane adhesive composition comprising:a) reacting a polyol component selected from the group consisting of polyether polyol, a polyester polyol, and combinations thereof having at least 1.75 hydroxyl groups per molecule in the presence of a compatible lower molecular weight hydroxy group containing compound with a diisocyanate compound selected from the group consisting of aliphatic, cycloaliphatic, and araliphatic diisocyanate compounds and mixtures thereof in the presence of a non-cytotoxic catalyst to form a hydroxy-terminated intermediate product having a viscosity of at least 5,000 cps when measured at a temperature of from about 25 to 35Â° C.; and b) reacting greater than a stoichiometric amount of said intermediate product with an isocyanate compound having a functionality of at least 2.0 in the presence of a non-cytotoxic catalyst to produce said pressure sensitive polyurethane adhesive composition having a molar excess of hydroxyl groups of at least 10% and having sufficient skin-tack and adhesive and cohesive strength to support attachment of a medical appliance to skin even under repeated use.