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| A list of commonly asked questions and their answers for Kuraray products and services. Mowiol®/Kuraray Poval® What is Mowiol® / Kuraray Poval®? What can I do with Mowiol® / Kuraray Poval®? How is PVOH properly dissolved? What can I do if my PVOH solution has formed a gel? How long can I store PVOH? Can I increase water-resistance by cross-linking? Is PVOH toxic? Mowital® What is Mowital®? What can I do with Mowital®? How are the Mowital® grades labelled? What are suitable solvents for Mowital®? ls Mowital® compatible with plasticizers and other resins? How long can I store Mowital®? Can Mowital® be crosslinked? Is Mowital® toxic? Exceval™ Poval Film What is Mowiol® / Kuraray Poval®? These are the tradenames of polyvinyl alcohols produced by Kuraray. Polyvinyl alcohol is produced by the polymerisation of vinyl acetate monomer and the subsequent, alkaline-catalysed methanolysis of the polyvinyl acetate obtained. Mowiol® and Kuraray Poval® grades are available as colorless granules or powders. What can I do with Mowiol® / Kuraray Poval®? PVOH produced by Kuraray can be used in a manifold of applications such as papers, adhesives, protective colloid for emulsion polymerisation, Film extrusion, textiles, ceramics, etc..., Mowiol® and Kuraray Poval® are your partners to solve problems in various segments. How is PVOH properly dissolved? At first our PVOH should be sprinkled into cold water while stirring followed by heating to 90-95°C employing a water bath or by use of live steam. The solution should be stirred well during cooling in order to prevent skin formation. Top What can I do if my PVOH solution has formed a gel? The increased viscosity of PVOH solutions can be reversed by reheating under agitation. How long can I store PVOH? You can store solid Mowiol® / Kuraray Poval® for an unlimited period of time under appropriate conditions, which means in original packs in closed, dry rooms, at room temperature. Can I increase water-resistance by cross-linking? Absolutely, even small additions of urea or especially melamine resins can substantially increase water-resistance of Mowiol® Films. This will also increase the Film hardness. Is PVOH toxic? No, Mowiol® / Kuraray Poval® is non-toxic. It has BgVV and FDA approvals for a variety of applications such as Adhesives, Resinous and polymeric coatings, Components of paper and paperboard in contact with aqueous and fatty/ dry food and for Polyvinyl alcohol Film to name just a few. Top What is Mowital®? Mowital® is the tradename of polyvinyl butyrals (PVB) produced by Kuraray Specialities Europe. PVB is produced by reacting polyvinyl alcohol (PVOH) with butyraldehyde in an acid medium (acetalization reaction). PVOH is produced by the polymerization of vinyl acetate monomer and the subsequent, alkaline-catalyzed methanolysis of the polyvinyl acetate obtained. The acetalization reaction of PVOH and butyraldehyde is not quantitative, so the resulting PVB always contains a certain amount of hydroxyl groups. In addition, from the previous saponification reaction, a small amount of acetyl groups also remains in the polymer chain. Mowital® is available as a colorless powder. What can I do with Mowital®? Mowital® is a thermoplastic polymer showing good mechanical properties, good flexibility, optical clarity and excellent adhesion to different substrates. It is compatible with a broad range of other resins and shows good solubility in different organic solvents. Mowital® can be used in a manifold of applications such as industrial coatings, laquers, primers, printing inks, adhesives, fiber binders, temporary binder for ceramics, Film for safety glass, etc... How are the Mowital® grades labeled? The properties of Mowital® grades are mainly influenced by the molecular weight and the degree of acetalization. The Mowital® range is labelled by a special code of letters and numbers. The numeric suffixes 20, 30, 45, 60, etc. refer to increasing molecular weight, resulting in increasing viscosity of solutions. The letters T, H and HH refer to increasing degree of acetalization. In detail: T means low, H means intermediate and HH means high degree of acetalization. Increasing degree of acetalization corresponds to decreasing amount of residual OH-groups and decreasing polarity. What are suitable solvents for Mowital®? Mowital grades are soluble in alcohols, glycol ethers and different mixtures of polar and non-polar solvents. Top ls Mowital® compatible with plasticizers and other resins? Mowital® shows good compatibility with many plasticizers (like adipates, phthalates, glycolethers, phosphates, sebacates, etc.) and other resins (like amino-formaldehyde, phenol-formaldehyde, epoxy, alkyd). Mowital is often used in combination with other resins to enhance physical and chemical properties. How long can I store Mowital®? You can store solid Mowital for at least 12 months in original packaging under dry and cool conditions. Can Mowital® be crosslinked? Yes, Mowital can be cross-linked via the reactive OH-groups with various thermosetting resins like phenolics, epoxies, isocyanates and melamines. Incorporation of Mowital® in a thermo-set composition will improve toughness, flexibility and adhesion of the cured coating. Is Mowital® toxic? No, Mowital® is non-toxic. It meets the requirements of the Recommendation XL, Lacquers and Coatings for Foodstuff Containers and Packaging of the German Federal Health Office (BgVV) as well as of section 175.300, Resinous and Polymeric Coatings, of the Food and Drug Association FDA/USA. Top |
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