Pressure-sensitive polyurethane composition with a low...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/40 (2006.01) C08G 18/72 (2006.01) C08G 18/76 (2006.01) C09J 175/04 (2006.01)

Patent

CA 2378222

The invention relates to a polyurethane composition with the properties of a pressure-sensitive adhesive, to a method for its production and to its use as pressure-sensitive adhesive. The aim of the invention is to provide an optimized adhesive that has good adhesive properties even when the adhesive link has been repeatedly released and joined again and with a reduced migration of noxious components. To this end, the invention provides a polyurethane composition that is obtained by reacting two components A and B, wherein a) at least one polyurethane prepolymer A1 is used as component the A, said prepolymer having been obtained by reacting at least one polyol component with at least two bifunctional different isocyanates, and b) at least one bifunctional hardener as the component B, said hardener having per molecule at least two functional groups that are reactive to isocyanate groups. The ratio of isocyanate groups to functional groups that are reactive to isocyanate groups should be greater than 0.75 and lower than 1.15.

La présente invention concerne une composition de polyuréthanne auto-adhésive, un procédé pour la préparer, ainsi que son utilisation en tant que substance auto-adhésive. L'objectif de cette invention est d'optimiser l'adhésion de la substance adhésive après avoir plusieurs fois ouvert puis de nouveau réuni la liaison adhésive, ainsi que la migration des composants nuisibles. Afin d'atteindre cet objectif, une composition de polyuréthanne est obtenue par réaction de deux composants A et B, sachant que a) au moins un prépolymère de polyuréthanne A1 est utilisé en tant que composant A, ce prépolymère ayant été obtenu par réaction d'au moins un composant polyol avec au moins deux isocyanates différents et au moins bifonctionnels, et b) un durcisseur au moins bifonctionnel est utilisé en tant que composant B, ce durcisseur présentant, par molécule, au moins deux groupes fonctionnels capables de réagir par rapport aux groupes isocyanates. Le rapport des groupes isocyanates sur les groupes fonctionnels capables de réagir par rapport aux groupes isocyanates est supérieur à 0,75 et inférieur à 1,15.

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