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AssigneeHoechst Aktiengesellschaft
InventorsDetlef E. Schumann, Adolf Wilhelm, Ursula Murschall, Herbert Peiffer, Brigitte Kusch
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The invention relates to an opaque, matte, multilayer polypropylene film. It includes at least one base layer comprising polypropylene or a polypropylene mixture and fillers, and at least one outer layer which contains a mixture or a blend of two components I and II. Component I essentially contains a propylene homopolymer or a copolymer of an .alpha.-olefin having 2 to 10 carbon atoms or a terpolymer of an .alpha.-olefin having 2 to 10 carbon atoms or a mixture of two or more of said homopolymers, copolymers and terpolymers or a blend of two or more of said homopolymers, copolymers and terpolymers. Component II essentially contains an HDPE having an MFI (50 N/190.degree. C.) of from greater than 1 to 50 g/10 min, measured in accordance with DIN 53 735, or a blend of two components A and B. Blend component A is essentially an HDPE having an MFI (50 N/190.degree. C.) of from greater than 1 to 50 g/10 min, measured in accordance with DIN 53 735. Blend component B is essentially a propylene homopolymer or a copolymer of an .alpha.-olefin having 2 to 10 carbon atoms or a terpolymer of an .alpha.-olefin having 2 to 10 carbon atoms or a mixture of two or more of said homopolymers, copolymers and terpolymers or a blend of two or more of said homopolymers, copolymers and terpolymers. The invention also relates to a process for the production of the multilayer polypropylene film and to the use of the film.
An opaque, multilayer polypropylene film having at least one matte side, comprising at least one base layer containing polypropylene or a polypropylene mixture and fillers, and at least one outer layer which comprises a mixture or a blend of two components I and II, wherein component I is selected from the group consisting of a propylene homopolymer, copolymers of .alpha.-olefins having 2 to 10 carbon atoms, terpolymers of .alpha.-olefins having 2 to 10 carbon atoms, a mixture of two or more of said homopolymers, copolymers and terpolymers, a blend of two or more of said homopolymers, copolymers and terpolymers, and blends of two or more of said homopolymers, copolymers and terpolymers, mixed with one or more of said homopolymers, copolymers and terpolymers;
A multilayer polypropylene film as claimed in 1, wherein the HDPE has an MFI of about greater than 5 to 45 g/10 min, a viscosity index from about 100 to 450 cm.sup.3 /g, a density from about 0.93 to 9.97 g/cm.sup.3, a degree of crystallization from about 35 to 80% and a melting point of about 120.degree. to 150.degree. C.
Dependencies are inferred from the claim text.