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US 5,470,502 AGranted
Fluorescent pigments
AssigneeBASF SE
InventorsErwin Hahn, Werner Ostertag, Guenther Seybold
Life of this patent
Estimating the term…
Abstract
Fluorescent pigments have a mean particle size of from 8 to 16 lm and contain apolar polymer matrices based on polymethyl methacrylate, polystyrene, polybutadiene-modified polystyrene, polycarbonate, polyvinyl chloride or polyamide and one or more apolar fluorescent dyes of the coumarin or perylene series.
Claims3
A fluorescent pigment having a mean particle size of from 8 to 16 .mu.m, said fluorescent pigment comprising
- an apolar polymer matrix selected from the group consisting of polymethylmethacrylate, polystyrene, polybutadiene-modified polystyrene, polycarbonate, polyvinylchloride and polyamide,
- and one or more apolar fluorescent perylene dyes of the formula I ##STR25## where R.sup.1 is hydrogen or cyano and
- R.sup.2 is C.sub.1 -C.sub.11 -alkyl
- or of the formula II ##STR26## where R.sup.3 is a C.sub.5 -C.sub.20 alkyl or is phenyl which is monosubstituted or polysubstituted by C.sub.1 -C.sub.13 -alkyl or C.sub.1 -C.sub.13 -alkoxy, and
- R.sup.4 is hydrogen, chlorine, phenoxy or halogen-, C.sub.1 -C.sub.4 -alkyl- or C.sub.1 -C.sub.4 -alkoxy-substituted phenoxy
- said fluorescent dyes being present in said pigment in an amount of from 1 to 38% by weight, based on said polymer matrix.
3 more elements
Dependencies are inferred from the claim text.