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Coating structure, sheet-like product and its use

A coating and product technology, used in coatings, pigmented coatings, paper coatings, etc., can solve problems such as uneconomical resources and energy waste.

Active Publication Date: 2020-12-25
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, laminated paper and board products often end up as a waste of energy, which is uneconomical from a resource point of view.

Method used

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  • Coating structure, sheet-like product and its use
  • Coating structure, sheet-like product and its use
  • Coating structure, sheet-like product and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Tables 1 and 2 give the precoat and topcoat formulations used. Styrene acrylate copolymers have a high degree of carboxylation. The applied coat weight of the precoat formulation is 2.0 g / m 2 .

[0060] Table 1 Precoated Test Coating Formulations in Example 1

[0061] P2(％) Coated colored starch 80 Styrene acrylate copolymer, Tg=10℃, highly carboxylated 20

[0062] Starches are cooked at 10% solids.

[0063] Test coating formulations of topcoat in table 2 embodiment 1

[0064] T3(％) Styrene acrylate copolymer, Tg=10℃, highly carboxylated 47.5 Completely hydrolyzed polyvinyl alcohol, molecular weight 47000g / mol 50 Potassium zirconium carbonate 2.5

[0065] The test result of coating preparation in the embodiment 1 of table 3

[0066]

[0067] As can be seen from the results in Table 3, the resulting coating structure provides good barrier properties.

Embodiment 2

[0069] Tables 4 and 5 give the precoat and topcoat formulations used. Styrene acrylate copolymers have a low degree of carboxylation. The applied coat weight of precoat formulation P3c is 2.4 g / m 2 .

[0070] Table 4 Coating Formulations Tested for Precoats in Example 2

[0071]

[0072] Table 5 Coating formulations tested for topcoat in Example 2.

[0073]

[0074] The test result of coating preparation in table 6 embodiment 2

[0075]

[0076] As can be seen from Table 6, improved KIT values ​​and good hexane vapor and water vapor results were obtained.

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Abstract

The invention relates to a coating structure for a sheet-like substrate comprising cellulosic fibres and to a sheet-like product. The structure comprises at least one pre-coat layer and a top coat layer, where the pre-coat layer(s) and the top coat5 layer comprise 10-90 weight-% of a styrene (meth)acrylate copolymer which is polymerised in the presence of a stabiliser, and which has a glass transition temperature Tg not greater than 20 DEG C, preferably not greater than 15 DEG C, more preferably not greater than 13 DEG C. Furthermore, the pre-coat layer(s) comprises a polysaccharide, such as starch, and the top coat layer comprises 5-60 weight% of at least one water-soluble coating binder,10 which selected from polysaccharides and polyvinyl alcohols, as well as at the most 5.0 weight% of across-linker, which reacts with -OH or -COOH groups.

Description

technical field [0001] The present invention relates to barrier coating structures, sheet-like products and product uses according to the preambles of the appended independent claims. Background technique [0002] Various coatings can be applied to the surface of paper or board to improve its properties. Grease barrier and water vapor barrier properties are particularly important for paper and board for products used for packaging purposes. Coatings applied to the surface of paper or board should provide an effective barrier against leakage of the packaged contents and / or protect the packaged goods from contamination and / or exposure to the surrounding atmosphere. Barrier requirements are particularly stringent for packaging materials used for food and consumer liquids. [0003] Coatings for packaging purposes should also have good crease and fold resistance. The coating should not break when the paper or board is folded into the box or wrapped around the product. Crackin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/10B65D65/42D21H19/20D21H19/22D21H19/54D21H19/60D21H19/82
CPCD21H19/20D21H19/22D21H19/54D21H19/60D21H19/824D21H19/828D21H27/10B65D65/42C09D133/06D21H19/56D21H19/82D21H11/00D21H19/64D21H27/30D21H19/385D21H19/58D21H19/822
Inventor 塔里娅·图尔基萨米·普托宁海伦娜·佩乌拉宁玛丽·奥亚宁厄兰·赫尔曼松
Owner KEMIRA OY