Adhesives, their preparation and use

Details Adhesives, their preparation and use Adhesives, their preparation and use

C - Chemistry, Metallurgy

09

J

402/131, 400/551

C09J 175/04 (2006.01) A61B 19/08 (2006.01) A61F 13/02 (2006.01) A61L 15/26 (2006.01) A61L 15/58 (2006.01) C08G 18/28 (2006.01) C08G 18/67 (2006.01) A61F 13/00 (2006.01)

Patent

CA 1333735

Skin friendly pressure sensitive adhesives in the form of inherently tacky polyurethane-containing gells may be prepared by reacting an isocyanate prepolymer, which is itself the reaction product of poly-functional isocyanate and polyoxyalkylene diol monoalkyl ether, with a hydroxyl-containing ester of acrylic or methacrylic acid and optionally other hydroxyl containing compounds and then cross-linking the polymer so formed by means of irradiation. The proportion of acrylate chosen is such that it will react with at least 15 to 25% of the free isocyanate groups in the prepolymer and the remainder react with the other hydroxyl containing compound. The adhesives are capable of absorbing up to 95%, typically from 35 to 95% by weight of water when hydrated. The use of the adhesive in highly moisture vapour permeable dressings is also disclosed.

553700

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