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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

Pending Publication Date: 2020-07-28
SUN CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] 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

[0081] 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, a mixture of industrial methylated spirits (IMS* also sold as TSDA) and water is mixed in a vortex mixer with gentle stirring on the vortex mixer. X2281 was further diluted (see Table 1).

[0082] Table 1 - Composition of Example 1

[0083]

[0084] IMS* = ethanol denatured with 2.2% ethyl acetate and 0.1% 2-propanol

[0085] As shown in Table 2, the following results were obtained.

[0086] Table 2 - Properties of Example 1

[0087] Example 1 Viscosity (#2 Zhan @ 23°C) seconds 23 %NVC 9.3 OTR 0 / 65% RH, 4gsm wet (0.36-0.4gsm dry) 1.2cc / m 2 / sky

Embodiment 2A、2B and 2C

[0089] 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

[0090] Table 3 - Compositions of Examples 2A, 2B and 2C

[0091] 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

[0092] As indicated in Table 4, the following results were obtained.

[0093] Table 4 - Properties of Examples 2A and 2C

[0094] Example 2A Example 2C Viscosity (#2 Zane @ 23°C) sec 20 21 %NVC 10.1 10 Wet OTR 0 / 65%RH, 4gsm (0.36-0.4gsm dry) 1.2cc / m 2 / sky

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Abstract

The invention relates to a polyvinyl alcohol and an ethylene vinyl alcohol copolymer barrier coatings. The barrier coating comprises a poly vinyl alcohol and / or ethylene vinyl alcohol co-polymer dissolved in an aqueous mixture that comprises at least 45% of one or more organic solvent. The barrier coating composition serves as a barrier against gas and / or harmful substances. Coating formulations comprise these co-polymers advantageously tolerate moderate to higher proportions of organic solvents in aqueous blends, and thus produce faster drying coating formulations.

Description

[0001] This application is a divisional application of the international application PCT / US2014 / 018533, which entered the Chinese national phase on August 21, 2015, with the application number 201480009982.9 and the invention name "polyvinyl alcohol and ethylene-vinyl alcohol copolymer barrier coating". [0002] Cross References to Related Applications [0003] 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. technical field [0004] 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 technique [0005] Traditionally, polymers containing high hydrogen-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D129/04C09D123/08C09D7/20
CPCC09D7/20C09D129/04C08K5/05C08K5/0008C09D5/00C08K5/04
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