| 摘要 |
The present invention relates to a multi-layer thermoplastic composition with at least one inner ultraviolet (UV) blocking or filtering layer having a high level of UV absorber(s)/stabilizer(s), and an outer surface layer with little or no UV absorber(s)/stabilizer(s). Preferably the UV-blocking or filtering layer composition is an acrylic or polycarbonate, and at least one surface layer is an acrylic or an acrylic blend. Typically the multi-layer composition is formed using a co-extrusion process. The multi-layer thermoplastic composition preferably has a high luminous transmission in the visible wavelengths and a very low transmission in the UV wavelengths.
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