Barriercoatings for
packagingKuraray Poval™, Elvanol™, Exceval™

Market drivefor sustainable
packaging solutions
There is a pull from the market to develop sustainable, novel and convenientpackaging for extended shelf-life foods. At the same time there is an industry
drive to increase the functionality of the produced paper and board andthrough that adding the commercial value. This is an opportunity for aqueous
barrier coatings on paper and board.

OOO

HHHOOHOO

Polyvinyl alcohol is a noionic water soluble polymer that iswell suited for water based barrier coatings. Polyvinyl alcohol is a linear and crystalline polymer that is also inherently
biodegradable under the right conditions. The hydrophilic
nature of polyvinyl alcohol makes it well suited as a barrier
against grease and oil as well as mineral oils. The hydrogenbonds between the polymer chains together with the crystalline structure make polyvinyl alcohol the best available barrier against oxygen. Polyvinyl alcohol is approved to be usedin food packaging according to BfR and FDA.

OOHOAn excellent barrier
against oxygen and greaseOHPolyvinyl alcohol

HOHOHO

PVOH

Barrier Material

Oxygen Barrier (OTR)

Polyethylene, polypropylene-PET+

PA6 (Nylon)

+PVDC

++

EVOH, PVOH+++OKuraray Poval™ & Exceval™

Kuraray case studies
Kuraray has worked intensively to develop water based barrier
coatings for the packaging sector and our Kuraray Poval™ andExceval™ are already used in applications where an oxygenbarrier or a grease barrier is needed. Examples for applications like these are paper bags for bread and coffee packaging.

Starch sizedbase paper
OTR of uncoated paper:> 2000 mL/m 2 /d
Used barrier coating:
Exceval™ HR-3010: 100 pts
Coating weight: 7 g/m 2
Reached OTR value:<1ml/m 2 /d23°C, 50% RH

Kuraray Poval™,Elvanol™ & Exceval™
product portfolio
Our Kuraray Poval™, Elvanol™ and Exceval™ are wellknown to the paper industry. They are widely used incoated graphical papers, ink jet papers, thermal papers
and release liners. They can be coatedwith all commonly used coating methods likefilm press, blade coaters or curtain coaters.
Kuraray offer a wide range of products
to meet the requirements and needsof the different applications.

ProductBarrier against

Viscosity (mPas)
4% solution

O2Grease

Mineral Oil

Water

Exceval™ AQ-4104

3,5 - 4,5+++

+++

++++

Exceval™ HR-3010

12,0 - 16,0++++++++++

Exceval™ RS 2117

25,0 - 30,0+++

+++

++++

Elvanol™ 90-50

11,6 - 15,4++++++++

Elvanol™ 71-30

27,0 - 33,0++++++++

Kuraray Poval™ 6-98

5,0 - 7,0++

+++

+++

Kuraray Poval™ 15-99

12,5 - 17,5++++++++

Kuraray Poval™ 28-99

26,0 - 30,0++++++++

Adding value toyour products –worldwide
Kuraray Poval™, Exceval™, Elvanol™ and Mowiflex™ are the trademarks for polyvinyl alcohols
made by Kuraray. Their key characteristics — outstanding film-forming properties and high binding strength — add real value to your products. Our polymers are water-soluble, highly reactive,crosslinkable and foamable. They have high pigment binding capacity, protective colloid characteristics and thickening effects. The physical and chemical properties of Kuraray Poval™ makeit ideal for a wide variety of applications, ranging from adhesives through paper and ceramics
to packaging films. Many of our polymers are food contact-approved and thus suitable for foodapplications. Ecologically Kuraray Poval™ is advantageous due to its biodegradability and the factthat combustion does not generate residues. It is available in various particle sizes from granules
to fine powders.
Kuraray produces its wide range of Kuraray Poval™ grades in Japan, Singapore, Germany and theUSA. Kuraray’s global production and service network make us your partner of choice for innovative high-quality PVOH resins.
Kuraray – Here to Innovate.

Headquarters
Kuraray Co., Ltd.
Tokiwabashi Tower
2-6-4, Otemachi
Chiyoda-ku
Tokyo, Japan 100-0004
Phone: +81 3 67 01 1000
infopoval.jp@kuraray.com

Kuraray Poval™
product portfolio
Please contact your local
Kuraray office to discuss theright Kuraray product foryour needs.

Kuraray America, Inc.
2625 Bay Area Blvd.,
Suite 600 Houston, TX77058
United States of America
Phone: +1 800 423 9762

Kuraray Asia Pacific Pte., Ltd.
250 North Bridge Road
#10-01/02 Raffles City Tower
Singapore 179101
Phone: +65 6337 4123

info.kuraray-poval@kuraray.com

infopoval.sg@kuraray.com

Kuraray Europe GmbH
Philipp-Reis-Str. 465795 Hattersheim am Main,
Germany
Phone: +49 69 305 85 351

Kuraray China Co., Ltd.
Unit 2207, 2 Grand Gateway
3 Hongqiao Road, Xuhui District,
Shanghai 200030, China
Phone: +86 21 6119 8111

info.eu-poval@kuraray.com

infopoval.cn@kuraray.com

11_2023