| 摘要 |
The films, foils, sheets and the like, flexible and transparent, fully formed of polyolefins, suitable in particular for the manufacture of infusional solution containers with the aid of forming, filling and sealing processes, comprise two terminal layers (A) and (C) of different polymeric composition, and "n" intermediate substrates B1, B2, ...Bi...Bn having gradients of ethylenic content and of softening temperature (fig. 1). |
