Abstract: Coloring master pellets for an optical molded article which are formed from a coloring composition, comprising a transparent thermoplastic resin (component A) containing a colorant (component B), wherein the proportion of pellets having colorant concentrations which satisfy a range of 0.5X to 1.5X when the concentrations of the colorants in the pellets are indicated in terms of absorbance and the average concentration is expressed as X is at least 90%. The coloring master pellets of the present invention have extremely small variations in the concentrations of colorants contained in the pellets. These master pellets are suitably used for obtaining an optical molded article such as an optical disk which has extremely few occurrences of color non-uniformity and color streaks and excellent electric properties.

Abstract: Coloring master pellets for an optical molded article which are formed from a coloring composition, comprising a transparent thermoplastic resin (component A) containing a colorant (component B), wherein the proportion of pellets having colorant concentrations which satisfy a range of 0.5× to 1.5× when the concentrations of the colorants in the pellets are indicated in terms of absorbance and the average concentration is expressed as X is at least 90%.