TRANSPARENT MULTILAYER FILM AND METHOD OF ITS PRODUCTION Russian patent published in 2002 - IPC

FIELD: multilayer films applicable in primary packing of materials sensitive to oxygen. SUBSTANCE: transparent multilayer film has external layer from polymer at least one binding layer ensuring its cohesion with adjacent layers and consisting of mixture of hopolymers of propylene and/or copolymers of polypropylene at least one thermoelastoplastic, and/or polyisobutylene and plasticizer, and internal layer from mixture of hopolymers of polypropylene and/or copolymers of polypropylene and at least one thermoelastoplastic. Film features temperature drop in melting points from external layer to internal one. Internal layer melts earlier than external layer. Thermoplastic elastomer is selected from group including block copolymers of styrene, polyesteramides, mixture of terpolymer of ethylene, propylene and nonconjugated diene with polypropylene, and mixture of butyl rubber with propylene. Method of multilayer film production consists in that at least two layers of film are subjected to combined extrusion. Said multilayer film is used in packing of food products, medicinal fluids and solutions, for instance, solutions of common salt, amino acids solutions, solutions for dialysis, solutions of blood substitutes, and blood proper. EFFECT: higher efficiency. 21 cl