The invention relates to a single- or multilayer, transparent, amorphous film which comprises at least one crystallizable thermoplastic as main constituent, in particular a polyester, and also comprises at least one hydrolysis stabilizer. The hydrolysis stabilizer is preferably a phenolic compound, an oxazoline, and/or a monomeric or polymeric carbodiimide, where appropriate combined with an organic phosphite. It is preferably added in the form of a masterbatch. On exposure to moisture and heat it shows practically no embrittlement and retains its tensile stress at break. The film may have been rendered UV-resistant, or flame-retardant, or one side or on both sides have been coated, or be sealable, and/or have been corona- or flame-treated. It is generally produced by extrusion or coextrusion, the hydrolysis stabilizer being added in the form of a predried or precrystallized masterbatch. The film can be shaped particularly effectively by thermoforming.
本发明涉及一种单层或多层透明无定形薄膜,其主要成分包括至少一种可结晶热塑性塑料,特别是聚酯,还包括至少一种
水解稳定剂。
水解稳定剂最好是
酚类化合物、
噁唑啉和/或单体或聚合碳二
亚胺,适当时可与有机
亚磷酸酯结合。它最好以母料的形式加入。在受潮和受热的情况下,它几乎不会发生脆化,并能保持断裂时的拉伸应力。薄膜可以是抗紫外线的,也可以是阻燃的,还可以是单面或双面涂层的,也可以是可密封的,和/或经过电晕或火焰处理的。一般采用挤压或共挤工艺生产,
水解稳定剂以预干燥或预结晶母料的形式加入。这种薄膜可以通过热成型技术特别有效地成型。