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VINNAPAS® EP 760
VINNAPAS® EP 760 is a unique, rapid-setting vinyl acetate-ethylene copolymer. It is not simply a high-solids version of VINNAPAS® EP series dispersion, but a polymer that has outstanding adhesion to very difficult-to-bond substrates including polyester, poly(ethylene terephthalate), tempered aluminum foil and polystyrene.
- Good adhesion to various plastic surfaces
- Permanently flexible adhesive joints
- High cohesion
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VINNAPAS® EP 760 can be compounded in a manner similar to VINNAPAS® EP706 and accepts all the common plasticizers, solvents, tackifiers and fillers used with vinyl acetate ethylene dispersions. The dispersion combines very high-solids content with a low viscosity — a combination that permits the addition of very high filler loadings, resulting in adhesive formulations with solid contents as high as 80 percent, or even greater. VINNAPAS® EP 760 accepts extraordinary amounts of fillers, such as clay and calcium carbonate, without excessive thickening. It also does not thicken rapidly on the addition of plasticizers and solvents, which is a useful property where high solids at moderate viscosities are required. VINNAPAS® EP 760 is very shear stable, which means that it can be applied on high-speed packaging machines using roll, extrusion or spray equipment. The dispersion dries to a slightly tacky, clear, water-resistant film. It is compatible with other vinyl acetate-based polymers, including PVAc homopolymer, Acrylic lattices and VINNAPAS® copolymer dispersions.
VINNAPAS® EP 760 high-solids content and excellent adhesion to plastic substrates make it especially useful in bonding PVC film to particle board, where the low water content reduces swelling of the wood. The excellent adhesion to difficult-to-bond surfaces shown by the dispersion is very useful in laminating films such as polyester, poly (ethylene terephthalate), poly (vinylidene chloride) and polystyrene to coated or uncoated papers. It shows good adhesion to metalized films and tempered aluminum foil. The rapid setting speed of VINNAPAS® EP 760 makes it very useful in high-speed packaging applications. The high-solids content is also important in bookbinding. The clear film and excellent adhesion of the dispersion are important in film overlay laminating. Typical application fields of VINNAPAS® EP 760 are as follows:
- Packaging (window cartons and carton forming)
- Envelop and bookbinding
- Textiles and upholstery
- PVC lamination and OPP wet lamination
- Packaging for difficult-to-bond substrates.
- Cigarette tipping / seaming and packaging
When the dispersion is stored in tanks, proper storage conditions must be maintained. VINNAPAS® EP 760 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
VINNAPAS® EP 760 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.
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