Single-component polyurethane adhesive

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 175/04 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08K 3/36 (2006.01)

Patent

CA 2410340

The invention relates to a pasty single-component polyurethane adhesive based on at least one polyurethane pre-polymer with an NCO terminal and at least one thickener, in addition to optionally at least one additive. According to the invention, A) the polyurethane pre-polymer with an NCO terminal is substantially linear, B) the thickener is a highly disperse silicic acid in a concentration of between 2.0 and 8.0 % by weight in relation to the pre- polymer, and C) the additive constitutes less than 10 % by weight in relation to the pre-polymer. The invention thus fulfils the practical requirements for an adhesive used for construction and assembly, both in terms of fluidity and non-sag properties.

La présente invention concerne un adhésif polyuréthanne pâteux à un composant, à base d'au moins un prépolymère de polyuréthanne à terminaison NCO, d'au moins un épaississant, ainsi qu'éventuellement d'au moins un additif. Selon cette invention, A) ledit prépolymère de polyuréthanne à terminaison NCO est majoritairement linéaire, B) ledit épaississant est un acide silicique hautement dispersé, se trouvant à une concentration allant de 2,0 à 8,0 % en poids par rapport au prépolymère, et C) l'additif/les additifs se trouve(nt) à une concentration inférieure à 10 % en poids par rapport au prépolymère. Cette invention permet ainsi de répondre aux exigences pratiques requises par un adhésif de construction et de montage en termes de fluidité et de résistance au fluage.

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