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Tuesday, 20 October 2020
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Raw materials & technologies, Technologies

Toyochem develops ultra-high solids polyurethane adhesives

Monday, 21 September 2020

Toyochem, a member of the Toyo Ink Group of Japan, announces that it has developed a new series of polyurethane pressure-sensitive adhesives (PSAs) with a ultra-high solids content of 99% or more.

Typically, the more solids an adhesive mixture contains, the higher its viscosity is, making it more difficult to coat. Image source: kwanchaift – stock.adobe.com (Symbol image).
Typically, the more solids an adhesive mixture contains, the higher its viscosity is, making it more difficult to coat. Image source: kwanchaift –...

As the company tells, the new adhesive composition achieves the same performance levels as conventional solvent-based PSAs, while reducing solvent and volatile content to minimal levels. They are suitable for use in a wide range of industrial applications such as protective films.

To meet the demand for lower VOC-emitting products, Toyochem has been gradually building on its lineup of high-solids content adhesive compositions with high levels of non-volatile content.

A unique synthesis method was introduced

Typically, the more solids an adhesive mixture contains, the higher its viscosity is, making it more difficult to coat. To resolve this issue, Toyochem researchers applied its original polymer and crosslink design technology to control chemical reactivity in the development of a new formulation with low viscosity and high solids content while maintaining performance standards. In addition, a unique synthesis method was introduced, making it possible to keep solvent content down to very low levels. These new developments enabled Toyochem to achieve near-100% solids formulations that exhibit excellent transparency, reworkability and air release properties on a par with conventional pressure-sensitive adhesives.

The PSAs are currently available in Japan with a worldwide release to follow in the next few years.

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