PVDC High Barrier Polymers
Diofan® PVDC Aqueous Dispersions
Diofan® PVDC aqueous dispersions, when applied on various types of base webs, significantly enhance their barrier and packaging properties, enabling them to ensure the freshness of food or to preserve the efficacy of drugs even when distributed to remote geographical areas.
In addition to offering high barrier properties for food and pharmaceutical packaging, Diofan® PVDC products are the basic ingredient for effective corrosion protection systems in the metal converting industry and maintenance sector. The building industry appreciates the unsurpassed humidity barrier for walls and floors of coating and primer systems containing Diofan® PVDC resins.
The broad-ranging chemical resistance of Diofan® PVDC coatings help protect the quality, appearance and performance of your valuable products.
Thanks to its unrivalled low moisture and water permeability, single coats or primers based on Diofan® PVDC dispersions exhibit outstanding corrosion resistance, even in the most severe environments.
Diofan® PVDC binders provide excellent early water resistance, with overall performance equivalent to that obtained from traditional high performance solvent based paint systems (salt spray performance > 1000 h). Diofan® PVDC helps in the formulation of highly technical, one-pack, water-based paints which are better for both health and the environment.
This low VOC dispersion (<100 ppm) allowing for the production of anti-corrosion systems compliant with European and local regulations, notably those related to VOCs.
Combination of Barrier Properties
The majority of liquid High Barrier Polymer is applied in a dedicated coating process. State-of-the-art coating machines or inline coating stations possess reverse gravure coating systems with closed pressurized chambers, corona treatment for the substrate, air flotation dryers (temperature and web tensions controlled), and inline measurement devices for coating weight, films shrinkage and web inspection.
Proven open gravure systems and air knife coating are still widely used. Examples of special applications include spray coating or dip coating.
Diofan® PVDC Applications
Aqueous Diofan® dispersions enhance and upgrade packaging materials by giving them barrier properties which prevent the transmission of water vapor or oxygen, as well as the ingress of odors.
Diofan® coatings provides strong seals to make hermetic packages and improves the appearance of packaging through its transparency, gloss, print-adhesion and scratch resistance.
Blister packs perfectly protect each individual tablet or capsule and are considered as the best packaging for pharmaceuticals, in terms of safety, traceability, hygiene and product life. SolVin® PVC and Diofan® PVDC dispersions are the perfect raw materials: PVC/Diofan® or PVC/PE/Diofan® multilayer films are particularly suitable as reliable secure packaging solutions for drugs that are sensitive to moisture.
Rigid PVC films coated with Diofan® can also be used when excellent barrier qualities are required to prevent gas, odors, and water vapor from reaching the product inside the packs.
Biaxially oriented polypropylene (BOPP) films are widely used for the packaging of biscuits, confectionary, snacks, cereals, salads & fresh products, overwraps for tobacco and perfumes, petcare etc. which are very sensitive to humidity and oxygen. The sealability of BOPP films is obtained by coextrusion of different types of polypropylene. Sometimes, the sealing and the barrier properties are not sufficient to conveniently close the package and to give good protection to the food.
For these reasons, most of the BOPP film producers have developed Diofan®coated structures which give good sealing properties as well as enhanced water vapor or gas barrier. BOPP films coated with Diofan®on either one or both sides can be found in a variety of packaging applications.
Besides PVC and oriented polypropylene PET films are widely used in complexes for various packaging applications. Associated with Diofan® coatings, PET films are suitable as high performance barrier films used e.g. as lid for thermoformed trays to pack fresh food, also under modified atmosphere (MAP). Those film you'll find also in stand-up pouches and in transparent and printed packaging solutions to protect fatty products like baked food, chocolate, olives etc.. Diofan® coated and laminated PET films can be pasteurized and used in the microwave.
Diofan® dispersions are the basic ingredient for effective corrosion protection systems in the metal converting industry and maintenance sector.
Diofan® based anticorrosive coating formulations enable cost efficient, reliable protection for automotive underbody and part coatings as well as for components in railway, agricultural, construction machinery and many other applications.
The building industry appreciates the unsurpassed humidity barrier for walls and floors of Diofan® containing coating and primer systems. Diofan® is the best water-borne liquid sealing membrane. This very low VOC dispersion is free of plasticizers and can be fully compliant with requirements for food grade paints. Ideally used as a one-pack primer on hygroscopic material, it gives outstanding protection against moisture. Diofan® primer coatings meet most demanding water-vapor barrier requirements according to ETAG 022 for liquid applied watertight covering for wet rooms with wearing surface.
Diofan® coatings on paper and cardboard provide excellent gas and moisture barrier, heat sealability, fat and chemical resistance and anti-static performance. Suitable substrates include a broad range from uncoated kraft papers to high gloss clay coated papers (30 – 120 g/m2) to cardboard.