Pressure-sensitive adhesives based on natural rubber and...

C - Chemistry – Metallurgy – 09 – J

Patent

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C09J 133/00 (2006.01)

Patent

CA 2743737

A pressure-sensitive adhesive consisting of a homogeneous mixture of at least one natural rubber component and at least one polyacrylate component displays significantly improved properties in cohesion and aging and weathering resistance compared to the individual components. Particularly good properties are achieved when the adhesive contains x% by weight of at least one natural rubber component, y% by weight of at least one polyacrylate component, v% by weight of at least one adhesive resin component and w% by weight of additives, where 10 <= x <= 80, 10 <= y < 95, 0 <= v <= 50, 0 <= w <= 10 and x + y + v+ w = 100. A single- or double-sided adhesive tape consisting of at least one support and at least one layer of such a pressure-sensitive adhesive therefore likewise has good cohesion and aging resistance properties.

L'invention concerne une matière adhésive sensible à l'effet de la pression, comprenant un mélange homogène d'au moins un composant caoutchouc naturel et d'au moins un composant polyacrylate, présentant par rapport aux composants individuels, des propriétés nettement améliorées en ce qui concerne la cohésion ou la résistance au vieillissement et aux intempéries. En vue d'obtenir des propriétés remarquablement bonnes, l'invention est caractérisée en ce que la matière adhésive renferme : x % en poids d'au moins un composant caoutchouc naturel, y % en poids d'au moins un composant polyacrylate, v % en poids d'au moins un composant résine adhésive et w % en poids d'additifs, proportions pour lesquelles on a 10 = x = 80, 10 = y < 95, 0 = v = 50, 0 = w = 10 et x + y + v+ w = 100. Un ruban adhésif à une seule face ou à double face, comprenant au moins un support et au moins une couche d'une telle matière auto-adhésive, présente par conséquent, de même, de bonnes propriétés de cohésion et de résistance au vieillissement.

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