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Adhesives and Sealants TopicsAdhesive & Sealant ProductsFinished Adhesives and SealantsPressure-Sensitive Adhesives (PSAs)

TOYOCHEM: Low-Odor, Low-VOC Acrylic Adhesive for Vehicle and Building Interiors

Photo of the interior of a car with a mother and child sitting in the seats

Toyochem Co. reports that EXK 21-046 PSAs demonstrate good bonding to metals, plastics, textiles, and other substrates. (Photo courtesy of Toyochem Co., Ltd.)

April 21, 2022

Toyochem Co., Ltd., the polymers and coatings arm of Japan’s Toyo Ink Group, has launched a new low-odor, low-VOC acrylic pressure-sensitive adhesive (PSA). Oribain™ EXK 21-046 is designed for use in enclosed spaces such as vehicles and building interiors.

EXK 21-046 PSAs reportedly demonstrate good bonds to metals, plastics, textiles, and other substrates and are capable of reducing total volatile organic compounds (T-VOCs)—or the indoor air concentration of a mixture of multiple VOCs—to levels less than one-tenth that of conventional products. The new low-VOC acrylic PSAs also effectively reduce odor levels, resulting in the increased health and comfort of indoor occupants.

The demand for low-impact interior materials has become a global trend as VOC emissions regulations tighten worldwide due to growing public and industry awareness of the importance of indoor air quality. VOCs are suspected to be one of the major causes of sick building syndrome and sensory irritation, so building interior materials made from low VOC-emitting materials are being used where possible. In addition, the rise in electric vehicles and automated driving technology is expected to drive the demand for low-odor, low-VOC materials used in automobile interiors.

“While our conventional PSAs clear the indoor VOC concentration guidelines set by the Japanese government, the newly developed EXK 21-046 system were able to dramatically reduce trace amounts of T-VOCs that remain in standard-type products and to improve air quality,” said Nao Nakamura, general manager of Toyochem’s adhesives division. “Toyochem research teams achieved this by developing a material that is not easily retained in the adhesive system and by applying our original polymerization and compounding technologies to better control viscoelasticity of the adhesive material. This results in a substantial reduction in T-VOC concentrations and lower odor intensity without compromising adhesive performance—a feat that had once been difficult to achieve. We believe the new EXK 21-046 PSA will help to realize indoor living spaces that are healthier for their occupants and for the Earth.”

According to the company, EXK 21-046 PSA achieves T-VOC emissions rates of 18 µgC/g, substantially down from the 310 µgC/g registered by Toyochem’s conventional PSAs. Moreover, the new PSA system realizes a 3.5 grade (clearly noticeable, but still not objectionable) on a 6-grade odor intensity scale, a reduction of 1.5 points from the typical 5 grade (very objectionable) recorded by the company’s standard-type products.

Additional details are available at www.toyo-chem.com/en.

KEYWORDS: acrylics adhesives in automotive adhesives in construction volatile organic compounds (VOCs)

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