Crosslinked polymer particles containing a fluorescent dye
AssigneeBASF SE
InventorsWolfgang Fischer, Andreas Deckers, Norbert Guntherberg, Ekkehard Jahns, Sylke Haremza, Werner Ostertag, Helmut Schmidt
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Abstract
Fluorescent pigments contain essentially a polymer matrix based on polymethyl methacrylate and a nonpolar fluorescent dye from the coumarin or perylene series, the polymer matrix being a crosslinked polymethacrylate or polyacrylate prepared by suspension polymerization.
Claims4
A process for the preparation of a fluorescent pigment comprising a polymer matrix based on polymethyl methacrylate and a nonpolar fluorescent dye from the coumarin or perylene series, wherein the polymer matrix is a crosslinked polymethacrylate or polyacrylate prepared by suspension polymerization, wherein a mixture comprising (A) from 69.9 to 99.8% by weight of a C.sub.8 -C.sub.8 -alkyl ester of acrylic or methacrylic acid,
- (B) from 0 to 29.9% by weight of a copolymerizable, monoethylenically unsaturated monomer and
- (C) from 0.1 to 30.0% by weight of a copolymerizable, polyfunctional, crosslinking monomer is polymerized in suspension in the presence of
- (D) from 0.1 to 15.0% by weight, based on the sum of (A) and (B), of a nonpolar fluorescent dye from the coumarin or perylene series and recovering the fluorescent pigment from the reaction mixture.
Dependencies are inferred from the claim text.