| 摘要 |
A composition useful for incorporation into polymer compositions employed for food packaging or the like comprising a bis- or tris-methine compound having the structural formula <IMAGE> wherein A is selected from the radicals <IMAGE> <IMAGE> <IMAGE> <IMAGE> +TR <IMAGE> wherein R' and R'' are each selected from chlorine, bromine, fluorine, alkyl, alkoxy, aryl, aryloxy and arylthio; each n is independently 0, 1, 2; R1 is selected from a large variety of radicals such as cycloalkyl, phenyl, and straight or branched alkyl which may be substituted; R2 is alkylene or the like; R3, R4, and R5 are each selected from hydrogen and alkyl; and P and Q and P1 and Q1 are selected from cyano, carbalkoxy, carbaryloxy, carbaralkyloxy, or the like. The invention compositions are especially useful in combination with molding or fiber-grade condensation polymer; most preferably such polymer having copolymerized therein a total of from 1.0 to about 100,000 ppm, of the reactant residue moieties of one or more of such bis- or tris-methine compounds.
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