Heat-seatable or non-heat-sealable, oriented, multilayer polyolefin film comprising ceramic particles
AssigneeHoechst Aktiengesellschaft
InventorsUrsula Murschall, Herbert Peiffer, Gunter Schloegl
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Abstract
The disclosed oriented, multilayer olefin polymer film comprises an olefin polymer base layer and at least one outer layer, which outer layer contains from 0.01 to 1% by weight, based on the weight of the outer layer, of approximately spherical ceramic particles. The outer layer can be heat-sealable or non-heat-sealable. The multilayer olefin polymer film is produced by a coextrusion process in which the coextruded film is biaxially stretched, heat-set, and optionally surface-treated. The resulting film is useful in packaging and as a printing surface or in laminates.
Claims15
An oriented, multilayer olefin polymer film comprising an olefin polymer-containing base layer and at least one outer layer, wherein at least one outer layer comprises from 0.01 to 1% by weight, based on the weight of the outer layer, of ceramic particles having a degree of sphericalness, f, ranging from 0.7 to 1, and having a mean particle diameter of from 1 to 10 .mu.m, said outer layer being heat-sealable or non-heat-sealable;
- said outer layer, when heat-sealable, comprising, in addition to said essentially spherical ceramic particles, a heat-sealable polymer of an .alpha.-olefin having 2 to 10 carbon atoms, and when non-heat sealable, comprising, in addition to said essentially spherical ceramic particles, a non-heat-sealable polymer which is homopolymeric or substantially homopolymeric, and wherein said degree of sphericalness, f, is defined as follows:
- ##EQU3## in which f ranges from 0.7 to 1, A is the cross-sectional area in mm.sup.2, and D.sub.max is the maximum diameter of the cross-sectional area in mm.
An oriented, multilayer olefin polymer film comprising an olefin polymer-containing base layer and at least one outer layer, wherein at least one outer layer comprises from 0.01 to 1% by weight, based on the weight of the outer layer, of essentially spherical ceramic particles having a mean particle diameter of from 1 to 10 .mu.m, said outer layer being heat-sealable or non-heat-sealable;
- said outer layer, when heat-sealable, comprising, in addition to said essentially spherical ceramic particles, a heat-sealable polymer of an .alpha.-olefin having 2 to 10 carbon atoms, and when non-heat sealable, comprising, in addition to said essentially spherical ceramic particles, a non-heat-sealable polymer which is homopolymeric or substantially homopolymeric.
Dependencies are inferred from the claim text.