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Barrier coatings for films and structures

A film and coating technology, applied in coating, thin material handling, transportation and packaging, etc., can solve the problem of difficulty in maintaining vermiculite particles

Active Publication Date: 2014-04-09
NANOPACK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vermiculite particles are still difficult to maintain in suspension
[0012] Finally, attempts to create barriers by adding various clay particles directly to extruded and blown thermoplastic films and molded articles are common, but only modest compared to the orders of magnitude improvement achieved using the clay-containing coatings described above. improve the impermeability of the barrier

Method used

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  • Barrier coatings for films and structures
  • Barrier coatings for films and structures
  • Barrier coatings for films and structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] A 6.5% polyvinyl alcohol (PVOH) batch was prepared by dissolving 193.6 kg of Elvanol 70-62 (Elvanol is a registered trademark of DuPont) in 2914.5 kg of deionized water at 80°C. The PVOH was added to the preheated water with vigorous stirring during the addition. Methylparaben was added to the mixture at 0.3% by weight of Elvanol plus water or 9 kg. The solution was stirred and heated overnight before all the PVOH and methylparaben dissolved. The solution was then cooled and filtered through cheesecloth supported on a stainless steel sieve to remove solid impurities. Check the concentration using a hand-held refractometer and adjust to account for water evaporated during the dissolution step. The evaporated water was replaced with deionized water so that the refractometer read 7.5 BRIX (based on the known relationship between BRIX readings and concentration, a reading of 7.5 BRIX corresponds to a PVOH solids concentration of 6.5% in water).

[0126] Prepare the solut...

Embodiment 2

[0129] Prepare the solution in a 10-ounce plastic cup. Place 26.1 grams of deionized water in the cup. An additional 2.9 grams of isopropanol was added and the contents mixed. To this mixture was added 0.3 grams of lithium hydroxide and the contents mixed until the particles were completely dissolved. Next, add 30.9 grams of 6.5% PVOH (as above) and mix well. Add another gram of Glyoxal 40L (Glyoxal 40L is Clariant's product name for glyoxal). Finally, 3.3 grams of Microlite 963 was added to the cup and the mixture was stirred for 5 seconds (Microlite is a trademark of W.R. Grace & Co. - Conn. and Microlite 963 is a 7.5% by weight suspension of vermiculite in water). Observe the rotational pattern of the particles, which indicates the alignment of the platelets in the plane of motion of the liquid. The glare occurs as a result of the platelets reflecting light from above.

[0130] The mixture was subjected to a "spin test" as defined above. After 10 minutes of spinning, ...

Embodiment 3-11

[0132] A mixture was prepared as in Example 2, substituting the processing aid listed in Table 1 for lithium hydroxide monohydrate. The mixture was subjected to a "spin test" as defined above. After 10 minutes, the swirling pattern and shiny light reflections of the Microlite963 particles were still there.

[0133] Table 1

[0134]

[0135] A series of experiments were performed to determine the effective lower limit for three of the stabilizers listed in Table 1 for the vermiculite clay platelets. The following examples can be applied to any stabilizer. The method is an iterative assay method.

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PUM

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Abstract

The invention provides coated substrates comprising a substrate and a barrier coating on at least one surface of the substrate. The barrier coating comprises (i) vermiculite, (ii) polymer capable of forming a film, (iii) chemical stabilizing agent selected from materials that contain cationic functionality selected from lithium, alkyl C2-C6 ammonium, allyl ammonium, heterocylclic ammonium, morpholonium, ammonium and amino C3-C6 alkyl carboxylic acids; lithium cations in combination with anions selected from carboxylic, phosphoric, phosphonic, sulfonic and fatty acids, lithium chelating agents, and lithium salts, ammonia, C3-C6 amine, heterocyclic amines, lithium hydroxide, morpholine, and morpholine oleate; and (iv) cross-linking agent. The invention also provides articles coated with such coatings, methods and mixtures for making such coated substrates and articles.

Description

[0001] related application [0002] This application claims the benefit of US Patent Application No. 61 / 513,853, filed August 1, 2011, the disclosure of which is incorporated herein in its entirety. technical field [0003] The present invention relates to barrier coatings containing vermiculite, films and shaped articles containing such coatings, and methods of making such coatings, films and articles. Background technique [0004] Barrier coatings are widely used in packaging materials to prevent the passage of permeable molecules or compositions, especially to prevent contact between the package contents and the permeate. Improving barrier properties is an important goal for manufacturers of films sold to contain products such as food, cosmetics, agrochemicals and pharmaceuticals. Hazardous penetrating chemicals of concern include oxygen, carbon dioxide, water vapor, aromatic and aliphatic hydrocarbons, manufacturing residues, odors, odors, smoke, pesticides, toxic mater...

Claims

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Application Information

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IPC IPC(8): C08J5/12C09D7/12C08K3/34C08J7/043C08J7/048
CPCC08K3/34C09D7/1291C09D7/1233C08K2003/2203C08J5/12C08K3/346C09D7/1216C08J2367/02C08J2377/00C08J2429/04C09D7/61C09D7/63Y10T428/265C08K5/098C08K5/17C08K5/357C08J7/0423C08K5/0025C08K5/0033C08J7/048C08J7/043C08L67/02C08L29/04C08K3/22C08K3/28C08K5/05C09D129/04
Inventor 霍华德·S·克拉维茨白瑞·J·霍斯泰特
Owner NANOPACK
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