The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 2020
Filed:
Sep. 16, 2016
Stora Enso Oyj, Helsinki, FI;
Isto Heiskanen, Imatra, FI;
Kaj Backfolk, Lappeenranta, FI;
Esa Saukkonen, Lappeenranta, FI;
Nina Ruohoniemi, Imatra, FI;
Katja Lyytikainen, Imatra, FI;
Stora Enso OYJ, Helsinki, FI;
Abstract
The present invention relates to a method for manufacturing a film having an oxygen transmission rate in the range of from 1 cc/m/24 h to 500 cc/m/24 h according to ASTM D-3985, at a relative humidity of more than 50% at 25° C., or higher than 75% at 25° C., or higher than 85% at 25° C., wherein the method comprises the steps of: providing a first suspension comprising a microfibrillated cellulose, wherein the dry content of the suspension is in the range of from 0.1 to 10% by weight, adding a wet strength additive to said first suspension, at an amount of from 0.1 to 10 weight-% based on the amount of microfibrillated cellulose (dry/dry), thereby forming a mixture of the microfibrillated cellulose and the wet strength additive, applying said mixture to a substrate to form a fibrous web and drying said web to form said film. The present invention also relates to a film produced according to the method.