Patent ID: 7232858

Claim:
An adhesive composition comprising a thermoplastic hydrophilic homogeneous polymeric matrix, said adhesive composition having a moisture vapor transmission rate of at least 200 g/m 2 24 h, an elastic modulus at 37° C., G′ 37 , and a viscous modulus at 37° C., G″ 37 , said thermoplastic hydrophilic homogeneous polymeric matrix having a 24-hour maximum liquid absorption capacity ranging from 0.02 g/g to 5 g/g, and a liquid absorption rate defined by said polymeric matrix having a liquid absorption capacity at 1 min that is at least 15% of said 24-hour maximum liquid absorption capacity; wherein said elastic modulus G′ 37 (1 rad/s) ranges from 100 Pa to 500,000 Pa; wherein said viscous modulus G″ 37 (1 rad/s) ranges from 50 Pa to 200,000 Pa; wherein the ratio G′ 37 (100 rad/s)/GΔ 37 (1 rad/s)<20; and further wherein said thermoplastic hydrophilic homogeneous polymeric matrix comprises: a first polar cohesive thermoplastic polymer or blend of polar cohesive thermoplastic polymers; a second polar adhesive thermoplastic polymer or blend of polar adhesive thermoplastic polymers; a compatible plasticiser or blend of compatible plasticisers; and, optionally, a tackifying, resin or blend of tackifying resins.