| 摘要 |
Disclosed are novel copolyester materials having improved weatherability and useful, for example, as films, fibers, sheeting and the like in outdoor applications where long and daily exposure to actinic radiation is encountered. These copolyesters comprise, for example, polyethylene terephthalate containing a total of from about 0.3 to about 5.0%, preferably from about 0.6 to about 2.0% by weight of one or more moieties having the formula <IMAGE> where R1 is cyano, alkylcarbonyl, cycloalkylcarbonyl or arylcarbonyl; R2 and R3 are, for example, alkyl, cycloalkyl, or aryl which may be substituted with a large variety of groups; and -X- is ortho, meta, or para to the -ylene linkage and is selected from groups of the formulae <IMAGE> +TR <IMAGE> wherein R is alkylene of 1-10 carbons, aryl, or cycloalkyl, each of which may be substituted.
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