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AssigneeTeijin Chemicals, Ltd.
InventorsAkihiro Sakamoto, Hideo Ninomiya, Hisayoshi Shimizu
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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.
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%.
An optical resin molding material comprising 3 to 50 wt % of the coloring master pellets of claim 1 and 97 to 50 wt % of pellets formed from the transparent thermoplastic resin.
Coloring master pellets for an optical molded article which are formed from a coloring composition comprising an aromatic polycarbonate resin containing a colorant, wherein
A method for producing coloring master pellets for an optical molded article which comprises the steps of:
Coloring 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 (component B) in the pellets are indicated in terms of absorbance and the average concentration is expressed as X is at least 90%.
Dependencies are inferred from the claim text.