Highly-tacky adhesive substance, production method and use...

C - Chemistry – Metallurgy – 09 – J

Patent

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C09J 123/20 (2006.01)

Patent

CA 2546190

The aim of the invention is to produce a highly-tacky adhesive substance from an adhesive substance, containing at least a) polyisobutylene and b) at least one tackifying resin, preferably an adhesive substance which is particularly suitable for use on splicing tapes which can compete with liquid glues, in particular, on coated materials. Said aim is achieved, whereby c) the molecular weight distribution of polyisobutylene has two relative maxima, d) one between 50,000 and 200,000 and e) the other between 1.0 x 106 and 3,5 x 106. Preferably, a minimum, between both mentioned maxima, amounts to a maximum of 60% of the height of the smaller of both adjacent maxima and, in the molecular weight distribution, the ordinate of the relative maximum which is between 1.0 x 106 and 3.5 x 106 amounts to a maximum of 25 % of the ordinate of the relative maximum which is between 50,000 and 200,000. The associated figure indicates a molar mass distribution according to the invention.

L'objectif de cette invention est de produire une substance adhésive très collante à partir d'une substance adhésive contenant au moins a) du polyisobutylène et b) au moins une résine tackifiante, de préférence une substance adhésive particulièrement appropriée pour être utilisée sur des bandes adhésives pour joints, capables de concurrencer des colles liquides, en particulier sur des matériaux enduits. A cet effet, c) la distribution de poids moléculaire du polyisobutylèbe présente deux maxima relatifs, d) un premier compris entre 50 000 et 200 000 et e) un second compris entre 1,0 x 10?6¿ et 3,5 x 10?6¿. De préférence, un minimum, situé entre les deux maxima mentionnés, s'élève au plus à 60 % de la hauteur du plus petit des deux maxima adjacents et, dans la distribution de poids moléculaire, l'ordonnée du maximum relatif compris entre 1,0 x 10?6¿ et 3,5 x 10?6¿ s'élève au plus à 25 % de l'ordonnée du maximum relatif compris entre 50 000 et 200 000. La figure associée indique une distribution des masses molaires selon l'invention.

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