VINNAPAS® 320 KR (ULS)
VINNAPAS® 320 KR (ULS) is a vinyl acetate-ethylene copolymer designed to provide the formulator versatility in the compounding of water-resistant and high-speed packaging adhesives.
- Good adhesion to various plastic surfaces
- Permanently flexible adhesive joints
- High cohesion
VINNAPAS® 320 KR (ULS) is compatible with both fully and partially hydrolyzed poly (vinyl alcohol) and will show no separation when formulated with any poly (vinyl alcohol) type. The dispersion has very good water resistance which can be improved by the addition of fully hydrolyzed poly (vinyl alcohol). When it is necessary to compound an easy-to-clean adhesive, partially hydrolyzed poly (vinyl alcohol) may be added. VINNAPAS® 320 KR (ULS) has strong wet tack and rapid setting speed. The dispersion also maintains its wet tack for an extended period of time, making it very useful in many packaging applications. Plasticizers will thicken VINNAPAS® 320 KR (ULS) as well as improve its water resistance and setting speed. The excellent wet tack of VINNAPAS® 320 KR (ULS) can be improved by the addition of tackified poly(vinyl alcohols) which will not separate when mixed with the dispersion. VINNAPAS® 320 KR (ULS) has excellent mechanical stability and does not thin excessively in high-shear applicators. The dried resin has excellent heat resistance. Also it is below 1000ppm residual monomer contented product.
VINNAPAS® 320 KR (ULS) has excellent adhesion to a wide variety of packaging substrates including clay-coated paperboard, water-resistant craft paper and films. Its excellent mechanical stability, wet tack and rapid setting speed allow application by a variety of techniques including roll, spray and extrusion. It can be used in bookbinding, envelope back seams, padding, microwave applications, and craft glues. The excellent water resistance of VINNAPAS® 320 KR (ULS) makes it ideally suited for use in adhesives for cups, glue laps, composite cans, multiwall bags and beverage cartons. The dispersion can also be used to compound adhesives for bonding PVC to lauan plywood for decorative effects.
If the product is used in applications other than those mentioned, the choice, processing and use of the product is the sole responsibility of the purchaser. All legal and other regulations must be complied with.
For questions concerning food contact status according the chapter 21 CFR (US FDA) and German BfR, please feel free to contact us.Wacker Chemie AG Hanns-Seidel-Platz 4 D-81737 München Germany
When the dispersion is stored in tanks, proper storage conditions must be maintained. VINNAPAS® 320 KR (ULS) has a shelf life of 9 months from the date of manufacture if stored in the original, unopened containers at temperatures between 5 and 40 °C. Iron or galvanized-iron equipment and containers are not recommended because the dispersion is slightly acidic. Corrosion may result in discoloration of the dispersion or its blends when further processed. Therefore the use of containers and equipment made of ceramics, rubberized or enameled materials, appropriately finished stainless steel, or plastic (e.g. rigid PVC, polyethylene or polyester resin) is recommended. As polymer dispersions may tend to superficial film formation, skins or lumps may be formed during storage or transportation. A filtration process is thus recommended prior to utilization of the product. If the product is stored for a longer period, stirring is recommended before use.
Preservation for Transport, Storage and further Processing
[name:000010651VINNAPAS® 320 KR (ULS) is adequately preserved during transportation and storage if kept in the original, unopened containers. However, if it is transferred to storage tanks, the dispersion should be protected against microbial attack by adding a suitable preservative package. Measures should also be taken to ensure cleanliness of the tanks and pipes. In unstirred tanks, a layer of preservative-containing water should be sprayed onto the surface of the dispersion to prevent the formation of unwanted skin and possible attack by microorganisms. The thickness of this water layer should be < 5 mm for low viscosity dispersions and up to 10–20 mm for high viscosity products. Proper procedures – periodic tank cleaning and sanitization – must be set up in order to prevent microbial attack. Contact your biocide representative/supplier for further plant hygiene recommendations. Measures should be taken to ensure that only clean air enters the tank when the dispersion is removed. Finished products manufactured from polymer dispersions usually also require preservation. The type and scope of preservation will depend on the raw materials used and the anticipated sources of contamination. The compatibility with other components and the efficacy of the preservative should always be tested in the respective formulation. Preservative manufacturers will be able to advise you about the type and dosage of preservative required.