Patent ID: 6326421
Filing Date: 2001-12-04
Classification: A61L,C08L,C09J,Y10T

Abstract:
A pressure sensitive adhesive material which is free of mineral oil and comprises:1) a continuous phase formed from(a) 10 to 30 wt % of a physically cross-linked solid rubber comprising a blend of linear or radial A-B-A block copolymers and 15 to 85% by weight, based on the total weight of component (a) of A-B block copolymer;(b) 18 to 40% of a compatible tackifying resin;(c) 20 to 60% of a low-molecular weight polyisobutylene; and(d) 0 to 50% by weight of butyl rubber modifier, and2) 15 to 70%, based on the total weight of the adhesive, of a discontinuous phase comprising one or more hydrocolloids that are soluble and/or swellable in water, all percentages being by weight and those of components (a) to (d) being based on the total weight of the continuous phase.