Polyester raw material, and film produced therefrom
AssigneeHoechst Aktiengesellschaft
InventorsRainer Kurz, Andreas Ferdinand, Hermann Dallmann
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Abstract
The invention describes a novel polyester raw material and the production and use of an oriented, single- or multilayer film having an overall thickness of .ltoreq.4 .mu.m and a roughness on at least one film surface of R.sub.a <30 nm, where the surface gas-flow resistance on at least one film surface is t.ltoreq.a.multidot.d.sup.b [sec], where a=0 to 10,000 [sec/.mu.m], b=3.0 to 0, and d (overall film thickness).ltoreq.4 .mu.m. The film contains first (I) and second (II) particles. The first particles are monodisperse and have an aspect ratio of 1.0-1.2.
Claims18
A film raw material comprising one or more thermoplastic polymers and particulate material, wherein the particulate material comprises first particles (I) having an aspect ratio of about 1 to 1.2 and second particles (II) having an aspect ratio of >about 1.2, wherein the particles (II) are selected from the group consisting of kaolin particles, aluminum oxide particles, silicon dioxide particles, particles of amorphous or pyrogenic silicic acid, particles of natural or precipitated calcium carbonate, organic particles, and mixtures or blends thereof, and wherein all particles in said raw material have a mean particle diameter of <2.5 .mu.m.
A film raw material comprising one or more thermoplastic polymers and particulate material, wherein the particulate material comprises first particles (I) having an aspect ratio of about 1 to 1.2 and second particles (II) having an aspect ratio of >about 1.2, wherein the mean particle diameter of the second particles (II) is greater than the particle diameter of the first particles (I), wherein all particles in said raw material have a mean particle diameter of .ltoreq.2.5 .mu.m, and wherein the second particles (II) have a mean particle diameter from about 0.5 to 2.5 .mu.m.
Dependencies are inferred from the claim text.