| 摘要 |
<p>A composition useful for molding into articles such as food containers, soft drink bottles, cured structural plastics and the like, comprising molding grade linear or unsaturated polyester or polycarbonate having reacted or copolymerized therein the residue of one or a mixture of methine reactants of formula (I), wherein R1 is an unsubstituted or substituted alkyl, cycloalkyl or aryl radical; A is an unsubstituted or substituted 1,4-phenylene radical; R2 is hydrogen or an unsubstituted or substituted alkyl, alkenyl, cycloalkyl or aryl radical; R3 is cyano, α or an unsubstituted or substituted carbamoyl, alkanoyl, aroyl, alkylsulfonyl, arylsulfonyl, aryl or aromatic heterocyclic radicals. The methine residues are present in the polymer as an integral part of the polymer chain and absorb ultraviolet radiation in the range of 250 to 390 nm. The residues are non-extractable from the polymer and stable at the conditions at which the polymers are manufactured and processed.</p> |
