CYCLIC-OLEFINIC COPOLYMERS AS NON-MIGRATING, POLYMERIC SLIP ADDITIVES IN LDPE CAST FILMS

摘要

Cyclic-olefinic copolymers (COC) are being used in flexible packaging as a blend component or as a discreet layer in multi-layer polyolefin films. They are typically used to enhance stiffness and heat resistance in food packaging. As a core layer in laminated or coextruded multilayer films, they provide high moisture barrier and exceptional clarity and stiffness.In place of commonly used organic slip additives, they can decrease film to film coefficient of friction (C.O.F.) to levels of commercial interest. Performance as a slip additive, however, is related to a number of variables, including viscosity of the matrix, type and add level of the COC. and the film process melt temperature. Various microscopy techniques investigated support the findings.