| 摘要 |
By means of additives which decrease the melt viscosity of a binder, a binder composition can be obtained which can be used to obtain shaped bodies of increased strength. By means of additives which decrease the melt viscosity of a binder, a binder composition can be obtained which can be used to obtain shaped bodies of increased strength. A powdered binder composition for binding particulate material containing (wt%): (A) at least one powdered mixed polymerisate (10-99.99) of glass transition temperature or melt index temperature of at least 30degreesC, from one or more comonomers (a1) from a group comprising: vinyl ester of optionally branched 1-18C alkylcarboxylic acid, (meth)acrylic acid ester of optionally branched 1-15C alcohols, dienes, olefins, vinyl aromatics and vinyl halides, and one or more ethylenically unsaturated functional comonomer (a2); (B) at least one powdered compound with at least two functional groups which can form a covalent bond with the functional groups of mixed polymerisate A; (C) a polymerisate from the group polyester, polyamide, polyether, polyolefin, polyvinyl alcohol, polyvinyl ester, polyvinyl acetate, fatty alcohols and their esters, amides and metal soaps, montanic acid and its esters and soaps, paraffins, of glass transition temperature or melt index at most159degreesC (0.01-90). An Independent claim is included for preparation of the composition by mixing component C as a powder with component A and optionally component B, or during polymerization mixed polymerisate A or optionally B is added, either in the forem of an aqueous dispersion with dispersions of mixed polymerisate A or B respectively, and is finally dried, or component A, optionally component B and C are extruded together as melts and the solidified product is comminuted.
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