US 11,752,678 B2
Polyester film with coating
Matthias Konrad, Kriftel (DE); Deborah Altenhofen, Mainz (DE); and Claudia Lohre, Wiesbaden (DE)
Assigned to Mitsubishi Polyester Film GmbH, Wiesbaden (DE)
Filed by Mitsubishi Polyester Film GmbH, Wiesbaden (DE)
Filed on Aug. 21, 2019, as Appl. No. 16/546,432.
Claims priority of application No. 10 2018 214 185.1 (DE), filed on Aug. 22, 2018.
Prior Publication US 2020/0061897 A1, Feb. 27, 2020
Int. Cl. B29C 48/00 (2019.01); C08G 63/183 (2006.01); C08G 73/10 (2006.01); C08L 67/02 (2006.01); B29C 48/08 (2019.01); C08J 7/04 (2020.01); B29K 67/00 (2006.01)
CPC B29C 48/0018 (2019.02) [B29C 48/08 (2019.02); C08G 63/183 (2013.01); C08G 73/10 (2013.01); C08J 7/042 (2013.01); C08L 67/02 (2013.01); B29K 2067/00 (2013.01); B29K 2995/0053 (2013.01); C08L 2201/10 (2013.01); C08L 2201/14 (2013.01); C08L 2203/16 (2013.01)] 13 Claims
1. A transparent, single- or multilayer, biaxially oriented polyester film comprising a barrier coating on at least one film surface;
Wherein the thickness of the biaxially oriented polyester film (exclusive of coating) is 8 μm-100 μm, and
Wherein the barrier coating is the drying product of an aqueous coating dispersion or aqueous coating solution which comprises at least one polyanion and at least one polyethyleneimine, where the polyanion comprises neutralized acid groups which are carboxylate, phosphate and/or sulfate groups, and the dry thickness d of the coating is in the range: 15 nm≤d<200 nm, and
wherein the biaxially oriented, coated polyester film has transparency≥88% and oxygen permeation lower at least by a factor of two than that of the uncoated biaxially oriented film, and
wherein the polyester in said polyester film is selected from the group consisting of polyethylene terephthalate, polyethylene 2,6-naphthalate, poly(cyclohexane-1,4-dimethylene terephthalate), polyethylene 2,6-naphthalate bibenzoate, and a copolyester of ethylene-glycol-derived monomer units and of terephthalic-acid-derived and isophthalic-acid-derived monomer units.