Release- und Trennmittel-frei wickelbare einschichtige Schmelzklebefolie mit guter Maschinengängigkeit aus Olefin-Copolymerisaten

摘要

Flexible, elastic, thermoplastic melt-adhesive film comprises a single layer with no release coating. This film can be wound and unwound without using an additional release agent, is essentially free from antiblocking agents and lubricants, and has a main melting peak below 90 degrees C. The film contains copolymers (A) and (B) of an olefin monomer, pref. ethylene, with different oxygen-contg. polar comonomers, the total amt. of such comonomers (w.r.t. total wt. of polymer in the film) being 18-40 wt.% and the amt. of the comonomer in copolymer (A) being at least 60 wt.% of the total amt. of O-contg. comonomers. The two copolymers are mixed under a shearing force so copolymer (B) is present as a finely-dispersed second phase in copolymer (A). Also claimed is a process for the prodn. of composites, by: (a) placing the film between any two substrates, and (b) forming a bond by the action of heat and pressure.