Polymer blends for producing films with a reduced number of defects
AssigneeTopas Advanced Polymers GmbH
InventorsWolfram Goerlitz, Anne-Meike Schauwienold
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Abstract
The invention relates to selected polymer blends which can be used for production of films or sheets having reduced defects, and also to a process for preparation of the polymer blends.
Claims31
1-20. (canceled)
A polymer blend comprising cycloolefin copolymer (COC) and from 1 to 10% by weight of polyethylene (PE), based on the weight of the polymer blend, wherein the polymer blend is prepared via mixing in solution or via melt-compounding.
A process for preparing a polymer blend, said process comprising the step of blending (a) a cycloolefin copolymer (COC);
- and (b) from 1 to 10% by weight of polyethylene (PE) based on the weight of the blend, wherein the COC and PE are blended via melt-compounding or via mixing in solution.
A process for producing a foil which includes a polymer blend comprising cycloolefin copolymer (COC) and from 1 to 10% by weight of polyethylene (PE) based on the weight of the polymer blend, wherein said process includes the steps of (i) compressing the polymer blend and heating the blend in an extruder until melted, (ii) extruding the melted blend through a flat-film die or annular die and, (iii) optionally, quenching the extruded blend on a chill roll, and drawing the resultant foil off on one or more rolls or rollers.
Dependencies are inferred from the claim text.