CANVERA™ Polyolefin Dispersions for can coating

DOW technologies
Introduction

Problem solving approach
The canning industry relies heavily on high performance can coatings to protect food and beverages from contact with metal, in order to support contents preservation, flavour quality and consumer safety. Likewise, coatings are designed to protect metal packaging from corrosion from acidic substances such as soft drinks, as well as blackening of the tinplate from foods high in sulphur, such as meat, fish or some soups. However, with traditional epoxy-based can coating systems relying on materials such as bisphenol A (BPA) in the formulation - a material coming under health scrutiny and resulting regulatory pressures in recent years – there is a clear market need for an alternative capable of meeting performance demands at the same time as recognising health and safety concerns

Solution description

CANVERA™ Polyolefin Dispersions from Dow offer a water-borne, spray-applied replacement for epoxy coating systems, minimizing bisphenol A (BPA) and other materials of concern.

The advanced, award-winning solution offers a next generation approach to safe, sustainable can coating that will appeal to progressive brand owners and retailers looking for excellent safety profiles from the packaging systems they use. Not only that, but coatings formulators and can makers can be safe in the knowledge they can still offer a cost effective, highly efficient answer to can coating requirements: the technology can be used on existing production lines and applied directly to metal surfaces by the same equipment used for current epoxy coatings.
The secret behind CANVERA™ is the Patented BLUEWAVE™ Technology from Dow, facilitating creation of ultra-thin, thermoplastic film coatings that can be spray-applied from water-borne formulations to the inside of cans, protecting contents from changes in colour, taste or appearance.
BLUEWAVE™ Technology facilitates the dispersion of polyethylene (PE) and polypropylene (PP) into stable emulsions in water. The small polymer particles remain suspended in water until applied to the can surface, at which point a bake step removes the water, melting the particles into a continuous coating with minimal defects.
Offering the same safety and flavour profiles as polyolefin materials widely used in other food packaging applications – an advantage over existing epoxy technology – CANVERA™-based coatings avoid materials of concern commonly found in other coating systems, such as styrene, epoxides and phenolic crosslinkers, offering a positive, long-term option to the entire value chain from coatings formulators to consumers.

Benefits

Offering the same safety and flavour profiles as polyolefin materials widely used in other food packaging applications – an advantage over existing epoxy technology – CANVERA™-based coatings avoid materials of concern commonly found in other coating systems, such as styrene, epoxides and phenolic crosslinkers, offering a positive, long-term option to the entire value chain from coatings formulators to consumers. Moreover CANVERA™ Polyolefin Dispersions offer a durable, stable dispersion, low VOC water-borne technology, with good chemical resistance and adhesion to variety of substrates

Approfondimenti