Toyo-Morton introduces solvent-free laminating adhesives for metalized multilayer packaging designs

JAPAN – Japan’s leading manufacturer of laminating adhesives, Toyo-Morton has launched a new ECOAD series of polyurethane solvent-free laminating adhesive systems.

Designed for the food packaging and industrial markets primarily in Asia, the solvent-free adhesives contain no volatile organic compound (VOC) to deliver more sustainability to end-users.

ECOAD adhesive solutions have made it possible to continuously laminate metalized packaging structures with two or three layers while maintaining integrity and a smooth look.

In addition, the new range does not require dilution with an organic solvent prior to laminating, providing considerable environmental benefits to end-users.

Toyo-Morton engineering team leader Yusei Uchiyama said: “While solvent-free adhesives are popular in Europe and the Americas, they represent only 5 to 10% of all laminating adhesives used in Japan.

“In general, solvent-free systems are not considered suitable for the continuous processing of multilayer films, as they tend to form bubbles or warp in the laminates.

To address the bubble problem, the team at Toyo-Morton has established a new methodology for adhesive layer rheology analysis that enables them to identify the factors that cause tunneling in metalized laminates.

“These findings led to the development of adhesives with enhanced physical properties, like the high heat and chemical resistance and laminate durability needed to bring about optimal adhesion without impacting the packaging material,” added Uchiyama.

The ECOAD solvent-free series is comprised of the base adhesive EA-N6008 combined with a hardener, the EA-N5618 or EA-N5633.

The EA-N6008 / EA-N5618 solution offers improved heat resistance and durability for zipper bags and enhanced performance in continuous lamination exhibits.

The solution imparts a smooth appearance in aluminium vapor deposited laminates such as PET/VMPET and PET/VMCPP, making it suitable for use in shampoo refill pouches and packaging for dried and boiled foods.

The EA-N6008 / EA-N5633 solution demonstrates excellent resistance to high acidic content and is specially designed for exclusively aluminum packaging structures such as single-serve sachets for ketchup and chili sauces.

Meanwhile, the company recently launched epoxy silane-free laminating adhesives for flexible packaging.

Epoxy silane is commonly used as an adhesion promoter in multilayer flexible packaging structures, helping to protect packaged content and extend its shelf life.

The company’s products conform to global food contact regulations for adhesives, such as the EU No.10/2011, U.S. FDA 175.105, China GB 9685-2016, and Japan’s Notification No. 196.

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