| 摘要 |
<p>1345176 Luminescent materials FARBWERKE HOECHST AG 19 April 1971 [14 April 1970] 26913/71 Heading C4S A daylight fluorescent pigment comprises a condesnate resin and a fluorescent dye having a formula in which X is oxygen or the group >N-R, R is hydrogen or an optionally substituted alkyl, cycloalkyl or aryl radical, a heterocyclic radical, a hydroxy group or the group -NH-Z in which Z is hydrogen, an optionally substituted alkyl or aryl radical, a heterocyclic radical or an acyl, alkyl-sulphonyl or aryl-sulphonyl radical; R 1 and R 2 , which may be the same or different, represent hydrogen, a halogen atom, e.g. Br or Cl or an alkyl alkoxy, aryl, carbalkoxy or cyano group; R 3 is hydrogen or an optionally substituted alkoxy group; and R 4 is hydrogen or R 3 and R 4 both represent optionally substituted alkoxy groups. Y is oxygen or sulphur and n is zero, 1, 2, or 3. Resins include cross linked polyesters, amideformaldehydes and amino-triazine formaldehydes. Preferred dyes are benzoxanthenes and benzothioxanthenes prepared by heating diazonium salts in the presence of Cu or Cu salts. Pigment is prepared by adding benzoxanthene- 3,4-dicarboxylic acid anhydride-di-sulphonic acid and resin, then paraformaldehyde to p-toluene sulphonamide at 130‹ C. The temperature is increased to 160-170‹ C. and on cooling a brittle material forms which is ground to a particle size of 0À1-30 Á. The pigment is used for paint, laquer, printing ink or to colour plastics material.</p> |
