Specialities foremulsion
polymerization
and adhesives

Kuraray Poval™ and Exceval™

Optimised solutions
for polymerization &adhesive processes
With Kuraray Poval™ and Exceval™, Kuraray offers a wide range of excellent
specialities particularly designed for the emulsion polymerization &adhesives process. Kuraray Poval™ and Exceval™ are the trademarks of thepolyvinyl alcohol (PVOH) from Kuraray. Both polymers are water soluble andcharacterised by their molecular weight (determined by their viscosity) andby the degree of hydrolysis. Exceval™, Kuraray’s novel special hydrophobic
modified PVOH is water soluble like standard polyvinyl alcohol and can beprocessed in conventional conditions. The hydrophobic-hydrophilic balance ofExceval has been optimized to combine good water resistance and sufficient
viscosity stability of the aqueous solution.
Kuraray’s polyvinyl alcohol specialities are available in a wide range of different grades, varying in molecular weight/viscosity and degree of hydrolysis.
Both factors considerably determine the performance properties of PVA
based emulsions.

Kuraray Poval™ & Exceval™

Polyvinyl alcohols
tailored to your needs

Emulsion properties as a function of the PVOH molecularweight and degree of hydrolysis
Increasing molecular weight
Low

Choosing the appropriate grade of PVOH is decisive for achieving the desired performance spectrum. The use of PVOH witha lower degree of hydrolysis will promote polymerization stability and the formation of lower particle size whereas higher
degree of hydrolysis PVOH will enhance the water resistance.
Also for certain applications, blends of polyvinyl alcohol withdifferent degree of hydrolysis are recommended to properly
balance emulsion stability and water resistance. PVOH with ahigher molecular weight/viscosity results in emulsion polymers
with high shear thinning tendency and higher wet tack.
Simultaneously, a lower degree of hydrolysis PVOH allows for
improved water sensitivity. Due to the high water resistance ofExceval™ HR-3010 and RS-2117 a D3 performance level canbe achieved without using any crosslinker. If an even higher
water resistance performance is needed, it can be achievedby simply using standard crosslinking systems. Furthermore,
Kuraray’s Exceval™ RS-1000 series show a high grafting
capability as well as an enhanced stabilization performance.

Kuraray Poval™ & Exceval™

Applications specializedin specialities
In emulsion polymerization processes, Kuraray’s PVOH specialities are excellent colloidal stabilisers for vinyl acetatebased emulsions, that are highly suitable as raw materials forwood glues and paper adhesives.
Among all the beneficial properties that polyvinyl alcohols
add to the final product, the most important ones are theimproved wet tack, the good heat resistance, the improved
adhesion to hydrophilic substrate and its ability to be crosslinked.
By simultaneously using different emulsifiers, finer emulsions
can be produced, that are suitable as binders in paint applications. Furthermore, the desired particle size for a particularpurpose can be achieved by adjusting the ratio of polyvinyl
alcohol and emulsifiers.
Kuraray's polyvinyl alcohols can also be added to polymer
emulsions after polymerization to improve certain propertiesof the end product, such as viscosity or open time.

Viscosity

High

High solid recipe
High tensile strength
Increasing wet tackLess

Shear thinning

MoreHigh polymerization stabilityLow

Water resistanceHighSmallParticle sizeLarge

More thixotropic
High freeze thaw stability
Increasing degree of hydrolysis

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 TowerSingapore 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

03_2024