VINNOL® Produces Brilliant Colors

Inks based on the innovative VINNOL® binder can be used to print barcodes on various kinds of plastics.

Samples have already been provided to all major customers. “The feedback is extremely encouraging. VINNOL® E 18/38 not only is a binder of the highest quality, but it also enables us to respond to customers’ needs and provide them with tailored technical service support,” says Feike van der Heide, who heads WACKER POLYMERS’ global Resins business. “Our goal is to continually develop new business fields and promote continued growth in existing markets through our innovative products.”

One of the first customers to formulate its products with VINNOL® E 18/38 was Chinese ink maker Beijing KinColor Digital Technology. “We have noticed a vast improvement in printing performance since then. One of the reasons for this is that the pigments are more evenly distributed in the printing ink thanks to the new VINNOL® E product,” explains Rong Jin, head of Beijing KinColor Digital Technology. This company has been using WACKER binders for many years because they offer a consistently high level of quality and performance. It collaborated with WACKER application technologists on the development of a suitable formulation for a printing ink containing VINNOL® E 18/38 that would be very well received on the market. “Thanks to WACKER, our new ink has strengthened our market position,” says Rong Jin.

“These requirements – low viscosity and no settling – pose a dilemma for ink makers.”

Dr. Ulrich Lauter Head of the applications laboratory for VINNOL® resins, WACKER POLYMERS

VINNOL® – BINDERS FOR INDUSTRIAL APPLICATIONS

The surface coating resins that WACKER sells under the VINNOL® brand are polymers that can be used as coatings in many industrial applications, including industrial coatings and adhesives, paints and printing inks, and heat-sealable coatings used in food packaging. VINNOL® surface coating resins are vinyl-chloride-based copolymers and terpolymers. Each grade differs from the others in terms of its composition and degree of polymerization, resulting in differences in their physical and chemical properties. The line-up also includes grades containing carboxyl groups for strong adhesion to metal surfaces, and grades containing hydroxyl groups that can be used, for example, in coatings that cure via chemical reaction.

Overall, the VINNOL® range encompasses a diverse array of product grades, all of which can be used together in any combination and are compatible with many other common binders. For the production of VINNOL®, WACKER uses two different polymerization processes: suspension and emulsion. Grades intended for use in digital printing inks are predominantly made by the emulsion process.

Inkjet printing is a non-impact process. The ink is deposited as very fine droplets on the substrate, without the need for an image carrier or “printing plate” as it is called in the industry. Instead, the digital print data determine which areas receive the ink droplets and which do not. This eliminates the costs of producing a printing plate and reduces the turnaround times for the printing press, enabling smaller print-runs of very few or just one single article to be economically viable.

There are two types of inkjet printing - drop on demand (DOD) and continuous inkjet (CIJ). DOD is used for printing paper and films, even in large formats. CIJ, in contrast, is mainly used in printers that are integrated into industrial production lines because it is capable of printing on uneven surfaces. This affords a way of providing the produced articles with a serial number, a brand name, a QR code or a shelf-life date.