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US 6,641,924 B1Granted
White, biaxially oriented polyester film with cycloolefin copolymer (COC), process for producing the film, and its use
AssigneeMitsubishi Polyester Film GmbH
InventorsHerbert Peiffer, Gottfried Hilkert
Life of this patent
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Abstract
The present invention relates to a white, biaxially oriented polyester film having at least a base layer, the characterizing features of which are that at least this base layer comprises a cycloolefin copolymer (COC) at a concentration of from 4 to 60% by weight, based on the base layer, where the glass transition temperature of cycloolefin copolymer (COC) is within the range from 70 to 270° C.
Claims20
A white, biaxially oriented polyester film comprising at least a base layer and optionally one or more other layers, wherein at least the base layer comprises a polyester and a cycloolefin polymer,
- wherein the cycloolefin polymer is a norbornene-ethylene copolymer or a tetracyclododecene-ethylene copolymer, wherein the cycloolefin polymer is present at a concentration ranging from about 4 to about 60% by weight, based on this layer, where the glass transition temperature of the cycloolefin polymer is above 110° C.,
- wherein the film has a gloss of about 80 or above and an opacity of about 55% or above, contains from about 10% to about 70% recycled material, and is oriented using a transverse stretching ratio of from about 3.5:1 to about 4.5:1.
Dependencies are inferred from the claim text.