Preparation of acrylic hot-melt pressure-sensitive adhesives from aqueous disperse systems
AssigneeTesa SE
InventorsPeter Gleichenhagen, Annemarie Muller
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Abstract
A process for preparing hot-melt pressure-sensitive adhesives from aqueous dispersions based on polyacrylate, and pressure-sensitively adhesive articles produced therefrom, which comprises producing highly concentrated aqueous dispersions with polymer contents between 68% by weight and 87% by weight of gel-free, molecularly-dispersely meltable polymer particles with an at least bimodal size distribution in size ranges between 0.5 μm and 1000 μm .
Claims11
A process for preparing hot-melt pressure-sensitive adhesives from aqueous dispersions based on polyacrylate, and pressure-sensitively adhesive articles produced therefrom, which comprises producing highly concentrated aqueous dispersions with polymer contents between 68% by weight and 87% by weight of gel-free, molecularly-dispersely meltable and polymer particles with an at least bimodal size distribution in size ranges between 0.5 μm and 1000 μm .
The process as claimed in one of claims 1-10, wherein, after the dewatering, up to 2% by weight of UV photoinitiators are admixed to the melt and/or incorporated into the acrylic polymer by copolymerization and/or up to 5% by weight of polyunsaturated (meth)acrylic monomers are incorporated into the melt and the film formed from the melt is crosslinked by means of 2 J/cm2-10 J/cm2 UV radiation and/or 10 kGy-100 kGy electron beams, so as to give an insoluble fraction of up to 95% by weight acrylic polymer.
Dependencies are inferred from the claim text.