Biaxially oriented UV-resistant, single- or multilayer polyester film with at antireflective coating
AssigneeMitsubishi Polyester Film GmbH
InventorsHolger Kliesch, Andreas Bork, Claudia Lohre, Ingo Fischer, Yavuz Ünker
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Abstract
The present, invention relates to a highly transparent, biaxially oriented, UV-resistant polyester film which has, at least on one side, a coating that reduces reflection of visible light. The film of the invention is suitable for the production of energy-saving sheet materials for greenhouses, in particular for cultivation of plants with high light requirement, e.g. tomatoes. The film has specific transparency properties and high UV resistance. The invention further relates to a process for the production of the polyester film, and also to use of the film in greenhouses.
Claims18
A single- or multilayer polyester film comprising,
- an antireflective coating on one side of said film, and
- an antireflective coating or an antireflective outer layer, with a lower refractive index than the refractive index of the film without the antireflective outer layer, disposed on that side of the film that is opposite to the side having an antireflective coating
- wherein the antireflective coating comprises polyacrylates and/or silicones and/or polyurethanes and/or polyvinyl acetate, and
- wherein said lower refractive index is at a wavelength of 589 nm in machine direction of below 1.64, and
- the film, with the exception of the coating(s), comprising a UV stabilizer in all layers,
- wherein the thickness of said antireflective coating is at least 60 nm and at most 130 nm,
- and wherein the film has a transparency of at least 93.5%.
Dependencies are inferred from the claim text.