Polyurethane pressure-sensitive adhesives

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 175/16 (2006.01) C08G 18/10 (2006.01) C08G 18/67 (2006.01) C08G 18/81 (2006.01) C08J 3/28 (2006.01) C08L 75/16 (2006.01)

Patent

CA 2241214

Methods for producing poly[urethane-(meth)acrylate]-based adhesives in which an isocyanate-terminated prepolymer is reacted to convert the isocyanate terminal groups into groups capable of cross-linking with each other, excess isocyanate groups are quenched with an isocyanate group quenching compound and the resulting prepolymer is then irradiated or heated to form the polyurethane-based adhesives, and adhesives produced thereby. Alternatively, a hydroxyl-terminated prepolymer is reacted with a reagent having isocyanate and methacrylate groups to form a prepolymer which is then irradiated or heated.

Cette invention concerne des procédés de fabrication d'auto-adhésifs à base de poly[uréthane-(méth)acrylate] dans lesquels on fait réagir un prépolymère à terminaison isocyanate de façon à transformer les groupes terminaux isocyanate en groupes susceptibles de subir entre eux une réticulation, on refroidit les groupes isocyanates excédentaires à l'aide d'un composé opérant un refroidissement rapide des groupes isocyanates et l'on irradie ou l'on chauffe le prépolymère résultant de façon à former les adhésifs à base de polyuréthane, puis les adhésifs fabriqués à partir de ceux-ci. Une autre possibilité consiste à faire réagir un prépolymère à terminaison hydroxyle avec un réactif comportant des groupes isocyanate ou méthacrylate de façon à former un prépolymère qui est ensuite irradié ou chauffé.

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