US 5,492,757 AGranted

Opaque, matte, multilayer polypropylene film, process for the production thereof, and the use thereof

AssigneeHoechst Aktiengesellschaft

InventorsDetlef E. Schuhmann, Adolf Wilhelm, Ursula Murschall, Herbert Peiffer, Wolfgang Meyer

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Abstract

The invention relates to an opaque, matte, multilayer polypropylene film having at least one matte surface which includes at least one base layer and at least one interlayer, and an outer layer applied to this interlayer. The base layer includes polypropylene and fillers. The interlayer includes a mixture or blend of two components I or II. Component I is a propylene homopolymer or a copolymer of .alpha.-olefins having 2 to 10 carbon atoms, or a terpolymer of .alpha.-olefins having 2 to 10 carbon atoms or a mixture or blend of said polymers. Component II is an HDPE or a blend of HDPE and a propylene homopolymer or a copolymer of .alpha.-olefins having 2 to 10 carbon atoms or a terpolymer having 2 to 10 carbon atoms. The outer layer essentially includes a propylene homopolymer or a copolymer of .alpha.-olefins having 2 to 10 carbon atoms or a terpolymer of .alpha.-olefins having 2 to 10 carbon atoms or a mixture or blend of said polymers.

Claims34

Dependent claims

An opaque, multilayer polypropylene film having at least one matte surface comprising at least one base layer containing polypropylene or a polypropylene mixture and fillers, at least one interlayer and at least one outer layer applied to the interlayer;

said outer layer 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 said homopolymers, copolymers and terpolymers, a blend of two or more said homopolymers, copolymers and terpolymers, and a blend of two or more said homopolymers, copolymers and terpolymers mixed with one or more said homopolymers, copolymers and terpolymers;
said interlayer comprises a mixture or blend of two components I and II, wherein
component I is selected from the group consisting of a propylene homopolymer, a copolymer of .alpha.-olefins having 2 to 10 carbon atoms, a terpolymer of .alpha.-olefins having 2 to 10 carbon atoms, a mixture of two or more said homopolymers, copolymers and terpolymers, and a blend of two or more said homopolymers, copolymers and terpolymers,
component II is selected from the group consisting of high-density polyethylene (HDPE) and a blend of two components A and B, wherein blend component A is essentially an HDPE and blend component B is selected from the group consisting of one or more polymers selected from the group consisting of propylene homopolymers, 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 said homopolymers, copolymers and terpolymers, and a blend of said homopolymers, copolymers and terpolymers.

1 more element

said outer layer is selected from the group consisting of
a propylene homopolymer,
a copolymer of ethylene and propylene,
a copolymer of ethylene and butylene,
a copolymer of ethylene and another .alpha.-olefin having 5 to 10 carbon atoms,
a copolymer of propylene and another .alpha.-olefin having 5 to 10 carbon atoms,
a terpolymer of ethylene and propylene and butylene,
a terpolymer of ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms,
mixtures of blends thereof, and
a blend of two or more said homopolymers, copolymers and terpolymers, mixed with one or more said homopolymers, copolymers and terpolymers;
said interlayer 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,
a copolymer of ethylene and propylene,
a copolymer of ethylene and butylene,
a copolymer of propylene and butylene,
a copolymer of ethylene and another .alpha.-olefin having 5 to 10 carbon atoms,
a copolymer of propylene and another .alpha.-olefin having 5 to 10 carbon atoms
a terpolymer of ethylene and propylene and butylene,
a terpolymer of ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms
mixture or blends thereof, and
a blend of two or more said homopolymers, copolymers and terpolymers, mixed with one or more said homopolymers, copolymers and terpolymers,
and wherein component II is selected from the group consisting of
an HDPE or
a blend of two components A and B, wherein
blend component A is
an HDPE and
blend component B is selected from the group consisting of
a propylene homopolymer,
a copolymer of ethylene and propylene,
a copolymer of ethylene and butylene,
a copolymer of propylene and butylene,
a copolymer of ethylene and another .alpha.-olefin having 5 to 10 carbon atoms,
a copolymer of propylene and another .alpha.-olefin having 5 to 10 carbon atoms,
a terpolymer of ethylene and propylene and butylene,
a terpolymer of ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms
mixtures or blends thereof.

33 more elements

Dependencies are inferred from the claim text.