POLYPROPYLENE FILMS WITH IMPROVED TIGHTNESS, IN PARTICULAR IMPROVED SEALING PROPERTIES Russian patent published in 2020 - IPC C08L23/12 C08L23/16 C08J5/18 

FIELD: packaging industry.

SUBSTANCE: invention relates to a polymer mixture which can be extruded per se or extruded onto one or both surfaces of the packaging film to produce a welded surface(s) that has heat sealability suitable for molding, filling, and sealing package. Disclosed is a mixture of polypropylene and plastomer for a molding, filling, and sealing package containing 80–93 wt % polypropylene, which is a random propylene copolymer, not containing an elastomer polymer phase dispersed therein and containing at least ethylene as a comonomer, and 7–20 wt % plastomer, which is a copolymer of ethylene and 1-octene. Disclosed also is a method of producing films from said mixture, corresponding films, containers thereof and a method of producing said containers.

EFFECT: technical result is that proposed mixture enables to obtain film with low temperature of beginning of thermal welding, which saves energy when producing package from said film and packaging products sensitive to temperature.

7 cl, 1 tbl