| 摘要 |
<p>Weatherable multi-layer structures that are ultraviolet stabilized contain a substrate layer of a polymer which degrades upon exposure to UV radiation and at least one ultraviolet protective layer based on a 2,2,4,4-tetramethyl-1,3-cyclobutanediol-based polycarbonate and an effective level of an ultraviolet absorbing compound. The UV absorbing compound is a benzotriazole, a dimeric benzotriazole, a triazine, a benzoxazinone, or a diphenylcyanoarylate.</p> |
