Barrier film comprising microfibrillated cellulose and microfibrillated dialdehyde cellulose and method for manufacturing the barrier film
A technology of microfibrillation dialdehyde and microfibrillation, which is applied in the field of manufacturing such films, can solve problems such as poor barrier properties, poor film-forming properties, and unstable dispersions.
Pending Publication Date: 2019-11-26
STORA ENSO OYJ
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Problems solved by technology
However, dispersions containing microfibrillated dialdehyde cellulose (DA-MFC) are very unstable because in the dispersion DA-MFC will settle and have spontaneously crosslinked to a certain extent, making the microfibrillar phase bind or tangle
Also, the poor stability of the dispersion also leads to variations in the concentration of DA-MFC in the film, resulting in poor film formation and thus poor barrier properties
Method used
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Embodiment Construction
[0023] The method according to the invention involves providing a first suspension comprising microfibrillated cellulose and mixing said first suspension with a second suspension comprising microfibrillated dialdehyde cellulose (DA-MFC) to form mixture. The mixture is then applied to a substrate to form a fibrous web and the web is then dried to form at least one layer of film. It has surprisingly been found that by forming a mixture comprising microfibrillated cellulose and microfibrillated cellulose from dialdehyde cellulose (DA-MFC), a more stable mixture is achieved. This improves handling and the ability of the mixture to form a good barrier film. Furthermore, it was found that by using said mixture in the production of at least one layer of the film, films having improved barrier properties at high humidity can be produced. In particular, it was surprisingly found that the film has a very good resistance to fluctuating humidity. The barrier properties of the film were...
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Abstract
The present invention relates to a method for manufacturing at least one layer of a film wherein the method comprises the steps of; providing a first suspension comprising microfibrillated cellulose,providing a second suspension comprising microfibrillated dialdehyde cellulose, mixing the first suspension with the second suspension to form a mixture, applying said mixture to a substrate to form afibrous web and drying said web to form at least one layer of said film. The present invention further relates to a film comprising said at least one layer.
Description
technical field [0001] The present invention relates to barrier films with good and stable oxygen transmission rate (OTR) at high relative humidity (RH). More particularly, the present invention relates to methods of making such membranes and the membranes produced. Background technique [0002] Currently, films comprising microfibrillated cellulose (MFC) have been shown to provide excellent barrier properties (see e.g. Aulin et al., Oxygen and oil barrier properties of microfibrillated cellulose films and coatings, Cellulose (2010) 17:559-574, Lavoine etc., Microfibrillated cellulose–Its barrier properties and applications in cellular materials: A review, Carbohydrate polymers 90 (2012) 735-764, Kumar et al., Comparison of nano-and microfibrillated cellular films, Cellulose (2014) 21:3443-3456), while The gas barrier properties are very dependent on the moisture or relative humidity in the surrounding environment. Therefore, it is very common to have to coat the MFC membr...
Claims
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IPC IPC(8): D21H11/18C08B15/02C08B15/10C08J5/18C08L1/02B82Y30/00C08J7/048C08J7/052
CPCB82Y30/00C08B15/02C08B15/10C08L1/02D21H27/10D21H11/18D21H19/34B32B27/10C08J2401/02C08J2401/04C08J7/0423C08J7/0427B32B2307/31B32B2255/06B32B2255/24B32B27/36B32B2307/7246B32B27/306B32B27/34B32B2255/28B32B2255/10B32B2255/205B32B2255/20B32B2307/7244B32B2553/00B32B27/08B32B15/043B32B27/32B32B2307/718B32B15/12D21H11/20D21H27/30C08J7/048C08J7/052C08J5/18B32B5/06B32B23/042B32B23/06B32B23/08B32B2439/00C08L2201/14C08L2203/16C08L2205/025
Inventor C.兰德亨斯达尔A.斯文森L.伯格奎斯特A.特伦卡尔斯特罗姆L.阿克斯鲁普
Owner STORA ENSO OYJ