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Plasticizer-free adhesive for difficult surfaces

For rough wood, foamed polystyrene, automotive tyres, metal castings, a variety of foamed and plastic surfaces and many others (Source: Herma)

GERMANY • Herma has developed a plasticizer-free, acrylate-based dispersion adhesive that is compatible with a variety of “difficult” surfaces. According to the company, the 65Tpc adhesive offers outstanding processing properties, sidestepping the drawbacks that can be associated with formulations for such surfaces. The new adhesive can be used on polyurethane and expanded polystyrene, rough PE canisters, tyres, metal castings and wooden pallets.

“We initially focused on tyre labelling,” explains Dr. Ulli Nägele, Herma’s head of development. “As with many synthetic materials, the problem lies in the low-energy surface, especially in combination with the carbon black particles that are contained in tyres.” Until recently, the only way to get anything to stick on a tyre was to use label stock with a thick coating of a rubber-based hot-melt adhesive. This formulation gave rise to complications, both when producing the labels and when dispensing them.

“Although the Herma 65Tpc adhesive also has a high coat weight, a special second layer endows it with high cohesive (internal) strength. This significantly reduces adhesive bleeding, so that the coating can be applied to the whole of the label without omitting certain areas or the edges,” explains Dr. Nägele. Since the dispersion adhesive does not contain any plasticizers, it does not attack or bleed through either the surface to which the label is attached or the label itself.

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Andreas Keller

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