Dip dyeing of plastic articles and the dye bath composition thereof
AssigneeFoster Grant Co., Inc.
InventorsTheodore A. Haddad, Walter Kondig, Richard A. Phillips
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Abstract
Dyeing of plastic articles, particularly sunglass lenses is conducted by use of a dye bath composition comprising a dye and a mixed solvent. At least about 70 weight % of the mixed solvent consists of glycerol and ethylene glycol whose relative ratio is in the range of from 95:5 to 20:80. The dyeing method and the dye bath composition are very advantageous for manufacturing sunglass lenses having high optical and aesthetic quality, particularly for dyeing hard-coated polarized lenses.
Claims21
A dye bath composition comprising a dye and a mixed solvent, said mixed solvent comprising about 70 to about 100 weight percent of glycerol and ethylene glycol in a relative weight ratio in the range of from about 95:5 to about 20:80.
A process of dyeing an organic polymer resin comprising contacting said resin with a dye bath composition comprising a dye and a mixed solvent, said mixed solvent comprising about 70 to about 100 weight percent of glycerol and ethylene glycol wherein the relative weight ratio between the said glycerol and said ethylene glycol is in the range of about 95:5 to about 20:80.
Dependencies are inferred from the claim text.