Nippon Paper Industries patented a hard coat film with superior adhesion to a cycloolefin polymer base film. The film includes a hard coat layer with an ionizing radiation curable resin, a primer layer with a modified polyolefin resin, and specific characteristics for optimal performance. GlobalData’s report on Nippon Paper Industries gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Nippon Paper Industries, Sustainable packaging paper coating was a key innovation area identified from patents. Nippon Paper Industries's grant share as of May 2024 was 40%. Grant share is based on the ratio of number of grants to total number of patents.
A recently granted patent (Publication Number: US11970593B2) discloses a hard coat film that includes a hard coat layer with an ionizing radiation curable resin laminated on a cycloolefin polymer base film through a primer layer. The primer layer consists of a modified polyolefin resin, where a polyolefin resin is graft-modified with an a,ß-unsaturated carboxylic acid or derivative, and a (meth)acrylic acid ester. The polyolefin resin is specified as a propylene-ethylene copolymer with a particular ratio of propylene to ethylene components. The hard coat layer contains a polyfunctional acrylate with three or more (meth)acryloyloxy groups per molecule.
The patent also details a method for producing the hard coat film, involving applying a primer layer paint to the cycloolefin polymer base film, followed by drying to form the primer layer, then applying a hard coat layer paint with an ionizing radiation curable resin to the primer layer, and finally performing ionizing radiation irradiation. The modified polyolefin resin in the primer layer has specific weight average molecular weight and glass transition temperature ranges. The a,ß-unsaturated carboxylic acid or derivative thereof used in the modified polyolefin resin is selected from a list of compounds. Additionally, the hard coat layer's ionizing radiation curable resin is a polyfunctional acrylate with specific characteristics. These patented innovations aim to enhance the durability and performance of hard coat films in various applications.
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