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AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsKAI BOEGE, MICHAEL DZIALLAS, KLAUS HELPENSTEIN, WOLFGANG KLAUCK, JOHANN KLEIN, HELMUT LOTH, HARTMUT URBATH, UDO WINDHOEVEL
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The invention relates to polystyrene binders modified by fatty compounds. The fatty compounds used are, in particular, esters of fatty acids or fatty alcohols, more especially triglycerides of higher fatty acids, preferably natural fats and oils. They may be added to the binder in high concentrations without adversely affecting the properties of the binder. However, their addition is of advantage in regard to the wetting properties, resistance to water and, above all, hardness. Dispersion adhesives, hotmelt adhesives and sealing compounds in particular can be improved with the binders according to the invention.
Binders based on homopolymers or copolymers of styrene, characterized by a content of fatty compounds.
Binders as claimed in at least one of the preceding claims, characterized in that they are based on a physically and/or chemically setting polymer with a molecular weight of 8,000 to 2,000,000, preferably 10,000 to 800,000 and more preferably 30,000 to 300,000.
Binders as claimed in at least one of the preceding claims, characterized in that more than 30% by weight and, in particular, more than 50% by weight of styrene is present in the styrene polymer.
Binders as claimed in at least one of the preceding claims, characterized in that they are liquid or spreadable at 20° C. and, in particular, assume the form of an aqueous dispersion with a solids content of 20 to 85% by weight, preferably 35 to 80% by weight and more preferably 45 to 75% by weight.
A process for the production of the binders claimed in at least one of claims 1 to 8 characterized in that the fatty compound is added to the styrene polymer, more particularly to an aqueous dispersion of the styrene polymer, before, during or after its production.
Dependencies are inferred from the claim text.