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AssigneeBASF SE
InventorsMatthias Gerst, Gerhard Auchter, Gledison Fonseca, Cornelis Petrus Beyers
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The present invention relates to aqueous polymer dispersions having a polymer content of at least 55% by weight that are suitable for pressure sensitive adhesives. The invention also relates to a process for preparing these aqueous polymer dispersions and also to the use of the aqueous polymer dispersions in pressure sensitive adhesives and, respectively, pressure sensitive adhesive compositions, especially in pressure sensitive adhesives for transparent substrates, e.g., plastics labels. The aqueous polymer dispersions have a polymer content of at least 55% by weight, based on the total weight of the dispersion, the polymer being composed of ethylenically unsaturated monomers M and having a glass transition temperature below −10° C., in which the dispersed polymer particles have a polymodal particle size distribution, in which at least 70% by weight, preferably at least 75% by weight, more particularly at least 80%, more preferably at least 85% or at least 90% by weight of the polymer particles have a particle diameter of below 350 nm, more particularly below 340 nm, especially below 330 nm.
An aqueous polymer dispersion comprising polymer particles having a content of a polymer of at least 55% by weight, based on a total weight of the dispersion, wherein the polymer comprises, in reacted form, ethylenically unsaturated monomers M and has a glass transition temperature of below −10° C., and wherein the polymer particles in the dispersion have a polymodal particle size distribution, at least 70% by weight of the polymer particles having a particle diameter, determined by centrifuging, of below 350 nm.
Dependencies are inferred from the claim text.