Coating composition, a method for coating a substrate, a coated substrate, a packaging material and a liquid package
a coating composition and liquid package technology, applied in the direction of packaging, synthetic resin layered products, rigid containers, etc., can solve the problems of instable curtain, small coating surface, and inconvenient coating process, and achieve the effect of improving the gas barrier function
Inactive Publication Date: 2014-09-11
BILLERUDKORSNES SKOG & IND AB
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Benefits of technology
[0021]Further, the coating composition may comprise platy particles, for example it may comprise Montmorillonite clay in nano particle form. This has the advantage of improving the gas barrier function. The c
Problems solved by technology
However, the curtain coating process is susceptible to certain defects, such as irregular heel formation, air entrainment and curtain instabilities that may result in a coated surface that displays smaller or bigger areas that lacks coating.
However, polysaccharides and polyvinyl alcohol, which are non-Newtonian fluids does have a considerably higher surface tension which leads to an instable curtain at low flow rates.
However, it has been found that even though the stability of the curtain improved when using a surfactant, the barrier effect of the coating deteriorated, and to such a degree that it was not usable for producing liquid packages.
As other examples, it has been proposed
Method used
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[0047]During the search for a suitable surfactant and a suitable method, many different commercially available surfactants were tested that were alleged to be suitable for curtain coating. However, they were all found unsuitable since they all failed either in providing a stable curtain or in providing a sufficiently good barrier.
[0048]After having performed many tests it was surprisingly found a group of surfactants that managed to provide the desired result of a stable curtain and a high quality barrier with an acceptable low amount of pinholes. This group of surfactants was non-ionic ethoxylated alcohols, such as sold under the trade names of Lutensol ON and Lutensol TO, by BASF. In particular Lutensol ON50, Lutensol ON70 and Lutensol TO8 were found to provide the required results.
[0049]According to the product information supplied by BASF, the Lutensol ON types are non-ionic surfactants. They are alkyl polyethylene glycol ethers made from a saturated synthetic, short-chain fatty...
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Abstract
The present invention relates to a curtain coatable gas barrier coating composition comprising a polymer and a surfactant, wherein the polymer is selected from a group consisting of polyvinyl alcohol and polysaccharides, or mixtures thereof, wherein said polysaccharides are soluble or dispersable or suspendable in water and the surfactant is a water soluble non-ionic ethoxylated alcohol. The present invention also relates to a method for providing a substrate with a gas barrier layer by means of the coating composition, and a coated substrate having at least one gas barrier layer obtained by coating the substrate with the coating composition. Further, the invention relates to a packaging material comprising a coated paperboard coated with the coating composition, and a liquid package comprising such a packaging material.
Description
TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates to a coating composition comprising a polymer and a surfactant, wherein the polymer is selected from a group consisting of polyvinyl alcohol and polysaccharides, or mixtures thereof. In particular it relates to a gas barrier coating composition suitable for curtain coating. The present invention also relates to a method for providing a substrate with a gas barrier layer by means of the coating composition, a coated substrate, a packaging material comprising a coated paperboard, and a liquid package comprising such a packaging material.BACKGROUND OF THE INVENTION[0002]Curtain coating is a coating process in which a linear flow of a liquid coating composition is deposited on a surface of a moving substrate, such as paper web. The coating composition forms a liquid sheet that falls freely before impinging onto the moving substrate that is to be coated.[0003]Curtain coating is a technique well suited for coating a paper...
Claims
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Patent Timeline
Login to view more IPC IPC(8): C09D129/04C09D103/02C09D7/12C09D101/02B65D25/14B05D1/30C09D7/45C09D7/63
CPCC09D129/04B65D25/14B05D1/305C09D7/1233C09D101/02C09D103/02B32B27/10C08K3/346C08K7/00D21H23/48B65D65/38D21H17/06D21H17/36D21H19/40D21H19/60D21H21/52C08L2205/03C08K2201/008C09D7/63Y10T428/277Y10T428/273Y10T428/1303Y10T428/31975Y10T428/31895Y10T428/31902C08K5/06C09D7/45C08L71/02C08L1/02C08L3/00C08L5/14B65D3/00C09D103/00C09D105/14D21H23/46B65D31/00B65D85/72D21H19/12D21H19/20D21H19/44
Inventor LARSSON, JOHANKARLSSON, ANDERS
Owner BILLERUDKORSNES SKOG & IND AB
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