Polyurethane pressure-sensitive adhesives

Details Polyurethane pressure-sensitive adhesives Polyurethane pressure-sensitive adhesives

C - Chemistry, Metallurgy

09

J

C09J 175/04 (2006.01) A61F 13/00 (2006.01) A61F 15/00 (2006.01) A61L 15/58 (2006.01) A61L 24/04 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01) C09J 175/08 (2006.01)

Patent

CA 2241216

Method for forming a polyurethane based adhesive composition in which a reaction mixture of at least one NCO-terminated prepolymer and a polyhydroxy compound is heated at a temperature and for a length of time sufficient to provide a gel content of from about 30 to 42 % by weight and a molecular weight of extractables of at least about 45,000. Polyurethane based adhesives prepared by the method and medical devices employing the same are also disclosed.

La présente invention concerne un procédé de réalisation d'une composition adhésive à base de polyuréthanne, composition dans laquelle un mélange réactif comprenant au moins un prépolymère à terminaison NCO et un composé polyhydroxy est chauffé à une température et pendant une durée suffisantes pour donner une teneur en gel allant d'environ 30 à 42 % en poids, et un poids moléculaire de produits extractibles d'au moins environ 45 000. L'invention concerne aussi des adhésifs à base de polyuréthanne préparés selon ce procédé ainsi que des appareils médicaux qui les utilisent.

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