Selvol™ Polyvinyl Alcohol
ANHUI LIWEI CHEMICAL CO.,LIMITED
[Introduction]
Manufacturers commonly use Selvol polyvinyl alcohol (PVOH) for adhesives. However, the industry and agriculture sectors also use it in emulsion polymerization, films and packaging, as well as in oil field cementing, paper, textiles, ceramics and seed coatings.
As a top PVOH supplier, SEKISUI continually develops new applications for and products featuring PVOH.
Manufacturers make Selvol PVOH from vinyl acetate monomer (VAM) via a multistep process. They polymerize VAM into polyvinyl acetate and then convert it to PVOH.
Grades
Selvol PVOH grades offer incredible versatility in one core product. In fact, it’s the most versatile PVOH product we offer. The key to working ideally with Selvol PVOH is finding the grade that suits your needs.
Standard Grades
Each Selvol PVOH grade varies in molecular weight and degree of hydrolysis.
We generally express molecular weight in terms of solution viscosity. First, we classify the viscosities as ultra low, low, medium and high. We commonly denote the degree of hydrolysis as super, fully, intermediately and partially hydrolyzed. Additionally, we offer a wide range of standard grades.
In addition to SEKISUI Specialty Chemicals’ standard product line, we provide multiple specialty grades. These include polymerization, fine particle size and tackified PVOHs:
Selvol PVOHs 805, 823 and 840 are improved versions of our standard polymerization grades (Selvol PVOHs 205, 523 and 540, respectively). These products offer many advantages in emulsion polymerization applications, including better water solubility and lower foaming.
Selvol PVOH S-grades are similar to our standard grades. However, they have a fine particle size so that more than 99% of the product passes through a U.S.S. 80-mesh screen. These grades are available commercially as Selvol PVOHs 203S, 205S, 523S and 540S.
Tackified Selvol PVOHs are products of the controlled boration of super-hydrolyzed and fully hydrolyzed grades. These borated alcohols yield viscous, aqueous solutions. These solutions also have a tailored degree of tack and significantly reduce penetration when applied to surfaces such as paper.
Selvol Polyvinyl Alcohol Solutions
At SEKISUI Specialty Chemicals, we provide premade solutions of some of our standard grades. A Selvol PVOH solution eliminates the dissolution step and creates distinct advantages:
Ready-to-use, improved solution consistency
Lower energy costs
Lower processing costs (no cooking required)
Typical Properties
Selvol PVOH grades have unique characteristics that make them useful in an array of applications.
By choosing from the many available Selvol PVOH grades, you can obtain the performance properties necessary for your specific applications. You can expect properties like these:
Water solubility
Abrasion resistance
Tensile strength
Adhesive and bonding properties
Grease or oil resistance
Film-forming qualities
Physical Properties
Selvol PVOH combines high tensile strength with ease of film formation. Additionally, Selvol PVOH resins show outstanding adhesive and bonding characteristics. Partially hydrolyzed grades adhere better to hydrophobic surfaces.
Furthermore, the degree of hydrolysis affects both the resin’s and the film’s water sensitivity. Water resistance increases as hydrolysis increases. You should use our super-hydrolyzed grades when you need maximum water resistance and humidity resistance. Greases, petroleum hydrocarbons and animal or vegetable oils generally don’t affect Selvol PVOH resins. Resistance to organic solvents also increases alongside the degree of hydrolysis. When necessary, you can plasticize Selvol PVOH film with glycerol or lower molecular weight glycols. These substances usuallyact as humectants to hold water in the film.
Specifications
| Item | Hydrolysis, mole% | 4% Solution Viscosity, cP | Total Volatiles, wt% | Total Organic Volatiles, wt% | Methanol, wt% | Ash - ISE, wt% | 4% Solution pH |
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