申请人:Eastman Kodak Company
公开号:US04661566A1
公开(公告)日:1987-04-28
Compositions comprising polyester or polycarbonate having reacted therein a total of from about 1.0 to about 5,000 parts by weight per million parts by weight of polyester of at least one UV absorbing compound of the formula ##STR1## wherein R is alkyl or the like, X is carbonyl or sulfonyl, R.sup.1 is hydrogen or a substituent, and Y and Z are hydrogen or substituents such as cyano or alkoxycarbonyl, with the provision that at least one of R, R.sup.1, Y, and Z is, or forms part of, or contains one or more reactive groups capable of undergoing a condensation reaction under polyester forming conditions, such that the UV absorbing compound is reacted into the polymer. The compound has a maximum light absorbance within the range of from about 320 nm to about 380 nm, which is nonextractable from the polyester and stable under the polyester processing conditions, for imparting UV screening properties to the polymer. Many products such as fruit juices, soft drinks, wines, food products, cosmetics and shampoos are deleteriously affected by UV light when packaged in clear plastic containers which pass significant portions of the available light at any wavelength from approximately 250 to 390 nm. By use of the present compounds polymeric containers can be manufactured which absorb these harmful wavelengths and therefore reduce or eliminate the UV light degradation of products packaged therein. A further advantage of the present polymeric compositions is that conventional polyester dyes and other additives such as pigments, fillers, brighteners and the like may be incorporated therein, and the UV screening properties of the methine compounds impart significant stabilization to both the polyester and the dyes.
本发明涉及一种包含聚酯或聚碳酸酯的组合物,其中至少有一种紫外线吸收化合物的重量为每百万份聚酯重量约为1.0至约5,000份,该紫外线吸收化合物的化学式为##STR1##其中R为烷基或类似物,X为羰基或磺酰基,R.sup.1为氢或取代基,Y和Z为氢或取代基,例如氰基或烷氧羰基,但必须至少有一个R、R.sup.1、Y和Z是,或者构成一部分,或者包含一个或多个在聚酯形成条件下能够发生缩聚反应的反应性基团,以便将紫外线吸收化合物反应到聚合物中。该化合物的最大光吸收范围为约320nm至约380nm,不可从聚酯中提取,在聚酯加工条件下稳定,用于赋予聚合物紫外线筛选性能。许多产品,如果汁、软饮料、葡萄酒、食品、化妆品和洗发水,在透明塑料容器中包装时受紫外线光的有害影响,这些容器在从大约250至390nm的任何波长处通过可用光的显著部分。通过使用本发明化合物,可以制造吸收这些有害波长的聚合物容器,从而减少或消除包装其中产品的紫外线光降解。本发明聚合物组合物的另一个优点是,常规的聚酯染料和其他添加剂,例如颜料、填充剂、增白剂等,可以被纳入其中,并且甲烷化合物的紫外线筛选性能对聚酯和染料都具有显著的稳定作用。