| 摘要 |
Disclosed is a UV absorbing polymeric composition having an extinction coefficient at 524nm (E524) of less than 2.0 l/g/cm, an extinction coefficient at 308 nm (E308) of greater than 20 l/g/cm and an E308/E524 ratio of greater than 10 which comprises an organic resin, titanium dioxide particles and an organic dispersing medium, is obtained by (i) forming a masterbatch composition by mixing a dispersion of titanium dioxide particles having a median particle volume diameter of less than 85nm in an organic dispersing medium with an organic resin, and mixing the masterbatch composition with a suitable organic resin, or (ii) by forming a dispersion of titanium dioxide particles having a median particle volume diameter of less than 85nm in an organic dispersing medium, and incorporating the dispersion directly into an organic resin. A method of producing this UV absorbing polymeric composition is also disclosed, which comorises the steps of providing (i) a masterbatch composition having an extinction coefficient at 524nm (E524) of less than 2.0 l/g/cm, an extinction coefficient at 308 nm (E308) of greater than 20 l/g/cm and an E308/E524 ratio of greater than 10 comprises an organic resin, an organic dispersing medium and titanium dioxide particles is obtained by mixing a dispersion of titanium dioxide particles having a median particle volume diameter of less than 85nm in an organic dispersing medium, with an organic resin, and mixing the masterbatch composition with a substrate organic resin, or (ii) a dispersion of titanium dioxide particles in an organic dispersing medium, and incorporating the dispersion directly into a substrate organic resin.
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