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Polyvinyl alcohol and ethylene vinyl alcohol copolymer barrier coatings

A technology of vinyl alcohol copolymer and polyvinyl alcohol, which is applied in the direction of coating, etc., and can solve the problems of blocking coatings and non-disclosure

Inactive Publication Date: 2015-11-25
SUN CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In summary, none of the prior art described above discloses (gas) barrier coatings comprising polyvinyl alcohol and / or ethylene-vinyl alcohol copolymers dissolved in an aqueous mixture containing at least 45% of an organic solvent such as a lower alcohol

Method used

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  • Polyvinyl alcohol and ethylene vinyl alcohol copolymer barrier coatings
  • Polyvinyl alcohol and ethylene vinyl alcohol copolymer barrier coatings
  • Polyvinyl alcohol and ethylene vinyl alcohol copolymer barrier coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] X2281 is a solution of polyvinyl alcohol in water supplied by Paramelt B.V. Netherlands. The polymer solution was supplied with a non-volatile content of about 20-22%. In the laboratory, with a mixture of industrial methylated spirits (IMS* also sold as TSDA) and water in a vortex mixer with gentle agitation on the vortex X2281 was further diluted (see Table 1).

[0080] Table 1 - Composition of Example 1

[0081]

[0082] IMS* = ethanol denatured with 2.2% ethyl acetate and 0.1% 2-propanol

[0083] As shown in Table 2, the following results were obtained.

[0084] Table 2 - Properties of Example 1

[0085]

Embodiment 2A、2B and 2C

[0087] 2-97 is a polyvinyl alcohol resin supplied by Kuraray Specialties Europe. It has a molecular weight of approximately 5000 Daltons. The viscosity specified by Kuraray as a 4% aqueous solution at 20°C is 2.2-2.3 mPa.s. The polymers were made into the following solutions (see Table 3) using the solution technique outlined by the manufacturer and diluted with lower alcohols including ethanol (IMS*), 2-propanol and 1-propanol.

Embodiment 2

[0088] Table 3 - Compositions of Examples 2A, 2B and 2C

[0089]

Example 2A

Example 2B

Example 2C

Mowiol 2-97 (20% solution)

50.0

50.0

50.0

IMS*

45.0

-

-

1-propanol

-

45.0

-

2-propanol

-

-

45.0

Deionized water

5.0

5.0

5.0

Total

100.0

100.0

100.0

[0090] As indicated in Table 4, the following results were obtained.

[0091] Table 4 - Properties of Examples 2A and 2C

[0092]

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Abstract

Barrier coatings with efficacy against oxygen and nuisance substances are described that comprise lower molecular weight PVOH and EVOH co-polymers, when coated on flexible substrates. Coating formulations comprising these co-polymers advantageously tolerate moderate to higher proportions of organic solvents in aqueous blends, and thus produce faster drying coating formulations.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application Serial No. 61 / 769,814, filed February 27, 2013. All applications are hereby incorporated by reference in their entirety and for all purposes. field of invention [0003] The present invention relates to solutions of low molecular weight polyvinyl alcohol (PVOH) and ethylene-vinyl alcohol (EVOH) copolymers in aqueous blends for the production of faster drying barrier coating formulations which can tolerate higher proportions of organic solvents, Especially lower alcohols. Background of the invention [0004] Traditionally, polymers containing high hydrogen-bonding groups with high hydrophilicity in their molecules—represented by polyvinyl alcohol (PVOH) and ethylene-vinyl alcohol (EVOH)—have been used as gas barriers polymer. PVOH and EVOH are considered water soluble polymers. Addition of up to about 20-30% ethanol or propanol to aqueous paint fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04
CPCC09D129/04C09D7/20C08K5/05C08K5/0008C09D5/00C08K5/04
Inventor 阿萨德·卡恩萨夫拉·卡恩迈克尔·莱昂纳德法里德·阿济济安
Owner SUN CHEM CORP
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