Dynamit Nobel Aktiengesellschaft

Gerhard Geier

Hans Huber

Claus Dietrich Seiler

Eduard Hansel

Edward Hansel

New alkenylacyloxysilanes in which the acyloxy grouping is derived from benzoic acid and a method for making the new compounds are disclosed. The present invention also relates to the use of these new alkenylacyloxysilanes in making pressure-sensitive adhesives which are prepared by copolymerizing these new compounds with at least two other ethylenically unsaturated compounds. The crosslinking of these new pressure-sensitive adhesives is performed preferably with the aid of known crosslinking catalysts and/or by high-energy radiation.

Alkenylbenzoyloxysilanes and their use in pressure-sensitive adhesives

The present invention relates to resin mixtures which are fluid at temperatures up to 100.degree. C. and which crosslink either at elevated temperature or under the influence of moisture. Thermal crosslinking takes place at temperatures of 100.degree. C. and up, preferably at about 120.degree. C. The mixtures contain one or more mutually compatible polymers containing hydroxyl groups, in which at least 5% and not more than 90% of the hydroxyl groups are replaced by alkoxysilyl groups. The introduction of the alkoxysilyl groups is accomplished by the reaction of a diisocyanate with a hydroxyl group on the polymer, on the one hand, and with an aminosilane or mercaptosilane ester on the other. On the basis of their fluid-to-viscous consistency at room temperature or moderately elevated temperature, the resins can be applied in a thin coating and easily crosslinked in situ.

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Lohmar, Germany

Gerhard Geier