| 摘要 |
1378880 Fluorescent acrylate/aminopsalt pigments FARBWERKE HOECHST AG 10 Nov 1971 [11 Nov 1970] 52172/71 Headings C3P and C3R [Also in Division C4] A daylight fluorescent pigment contains an organic fluorescent dyestuff and the product of reaction of a copolymer of one or more (meth)- acrylates containing one or more hydroxyl, carboxyl methylol or methylol ether groups and one or more vinyl compounds lacking such groups with an etherified urea-formaldehyde or aminotriazine-formaldehyde resin. The weight ratio of copolymer to resin is preferably 8 : 2 to 2 : 8, the dyestuff amounting to 0À1-10 wt. per cent of the resin plus copolymer. In the examples copolymers of acrylic acid with methyl methacrylate, hydroxyethyl methacrylate and butyl methacrylate, with and without styrene, α-methylstyrene or methacrylamide, the last being methylolated, are mixed with a butylated melamine formaldehyde resin, in weight ratios 7 : 3, 6 : 4 and 4 : 6, and a fluorescent dye, and cured and ground to give pigments. Butylated acetoguanamine or benzoguanamine formaldehyde resins may also be used. The dye used is 10 - methoxy - benzoxanthene - 3 : 4 - dicarboxylic hydrazide or Rhodamine B; the following are also used: benzoxanthene-3 : 4-dicarboxylic acid amide, benzoxanthene-3 : 4- dicarboxylic acid - N-31-sulphonamide-phenyl imide, benzothioxanthene-3 : 4-dicarboxylic acid stearylic imide, benzothioxanthene-3:4- dicarboxylic acid hydrazide, 4-amino-1 : 8- napththal-21 : 41-dimethyl phenyl imide and 7-oxo-14-thia-dibenzo (d, d, e, f), chrysene. The pigments are used to mass-colour PVC or polystyrene, or are incorporated into a lacquer containing a shortoil alkyd resin and a melamine formaldehyde resin. |
