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US 12,734,793 B2Granted
Polymeric film and uses thereof
AssigneeMylar Specialty Films U.S. Limited Partnership
InventorsKatrina Thorburn, Dmytro Stratiychuk-Dear, Karl Rakos
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Abstract
A matt polymeric film, which may be a single layer or multi-layer film, comprising particles having a volume-weighted mean size (D(4,3)) of no more than 25 μm. The particles may be present in an amount of from about 5% to about 35% by volume fraction of the film. The matt film is suitable for use as a printable film and/or as a release film in cast release applications.
Claims27
A composite multi-layer coextruded matt film comprising:
- a) a self-supporting first layer A of a film of a first polymer A1;
- b) an optional primer layer on said first layer, between said first layer and the second layer;
- c) a second layer B of a second polymer B1, being located on the optional primer layer where present, or directly on said first film layer A in the absence of said optional primer layer, the second layer forming a matt, outer surface of the multi-layer film;
- wherein the second layer comprises particles having a volume-weighted mean size (D(4,3)) of no more than 25 μm, wherein the particles are present in an amount of from about 5% to about 35% by volume fraction of the second layer B of the film, and wherein the matt, outer surface exhibits a 60° gloss of no more than 8 units and an 85° gloss of no more than 10 units;
- wherein the second layer B has a surface texture characterised by a Sq value of at least 0.5 μm and of no more than 10 μm, wherein the Sq value is measured using the ISO 25178 method;
- and
- wherein the film has a Gurley porosity of from 25,000 to 250,000 seconds.
4 more elements
A composite multi-layer coextruded matt film for cast release applications, wherein the film comprises:
- a) a self-supporting first layer A of a film of a first polymer A1 (optionally wherein the first polymer is a polyester), optionally wherein said film is oriented in at least one direction;
- b) an optional primer layer on said first layer, between said first layer and the second layer;
- c) a second layer B of a second polymer B1, being located on the optional primer layer where present, or directly on said first film layer A in the absence of said optional primer layer, (optionally wherein said second polymer is a polyester), the second layer forming a matt outer surface of the multi-layer film;
- where the second layer comprises particles,
- where the particles
- i) are present in the second layer B in an optional amount of from 3 to 30% by weight, the weight of said second layer being 100%;
- ii) have a volume-weighted mean size (D(4,3)) of no more than 25 μm;
- and
- iii) are present in the second layer in an amount of from about 5 to about 23% by volume fraction, the volume of said second layer of which the particles form a part being 100%;
- and
- wherein the matt outer surface exhibits a 60° gloss of no more than 8 units and an 85° gloss of no more than 10 units;
- wherein the second layer B has a surface texture characterised by a Sq value of at least 0.5 μm and of no more than 10 μm, wherein the Sq value is measured using the ISO 25178 method;
- and
- wherein the film has a Gurley porosity of from 280,000 seconds to 500,000 seconds.
11 more elements
Dependencies are inferred from the claim text.