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Polyplastics-Evonik and Toray Co-Develop Multilayer Plastic Tube Material Offering Long-Term and Hydrolysis Resistance

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Jun. 9, 2022

Polyplastics-Evonik Corporation
Toray Industries

Key features
・ High long-term heat resistance
・ Excellent hydrolysis resistance
・ Low ion leaching
・ Corrugated version available

Tokyo, Japan, June 9 2022 – Polyplastics-Evonik Corporation and Toray Industries, Inc., announced today that they have jointly developed an adhesive for bonding polyamide (PA) and polyphenylene sulfide (PPS) resins, and have developed a multilayer plastic tube (MLT) configuration for cooling lines that employs Toray’s TORELINA® PPS resin for the inner layer and Polyplastics-Evonik’s PA 12 for the outer layer.

The new MLT setup can resist temperatures of around 130°C, significantly higher than conventional counterparts. Ion leaching in cooling water is low. The two companies envisage offering the new tube material for cooling lines in automobiles as well as in industrial machinery and other general applications.

Recent years have seen deployments increase of PA mono layer tubes and MLT with polypropylene inner layers to reduce weight and reduce fuel consumption. The downside is that heat resistance and hydrolysis issues with these conventional plastic tubes limited their use to lines for relatively low-temperature cooling water.

PPS offers excellent heat and hydrolysis resistance and can resolve these issues as a material for tube inner layers. A need emerged to develop an adhesive material because it is impossible to directly bond PPS with PA 12 and other long-chain PAs commonly used in outer layers of automotive tubing.

Polyplastics-Evonik and Toray accordingly joined hands to develop an adhesive material that can bond those resins. They combined their polymer technologies with Toray’s polymer alloy technology. The result was a material that delivers excellent adhesion between PA and PPS to deliver stable extrusion molding for MLT. The adhesive enables an MLT configuration comprising a PPS inner layer and PA 12 outer layer.

This configuration facilitates molding with standard plastic tube extrusion equipment. Corrugated molding is also possible, enabling production in various shapes without compromising mechanical robustness. Envisaged uses for the two companies’ new technology are to replace metal automotive cooling lines, especially in locations with flows of high-temperature cooling water, and to take advantage of its low ion leaching for adoption in cooling lines for electric and fuel cell vehicles.

As well as offering the new MLTs with PPS inner layers, Polyplastics-Evonik will market regular PA mono layer and multilayer tubes. The company will thereby help reduce automotive carbon dioxide while continuing to provide detailed technical support to customers in the drive to materialize a sustainable economy.

Toray is the world’s only PPS manufacturer to integrate the production of monomers, polymers and compounds, and has the world’s greatest PPS polymer production capacity. By commercializing the

new material for multilayered resin tubes with a PPS inner layer, the company aims to contribute to next-generation automobile development, and, like Polyplastics-Evonik, help create a sustainable economy.

TORELINA® is a registered trademark of Toray Industries, Inc.

Three-layer plastic tubing configuration
Outer layer   PA 12 (Polyplastics-Evonik)
Adhesion layer   New material (Toray)
Inner layer   TORELINA PPS (Toray)

TORELINA PPS and PA 12 multilayer plastic tubing for cooling line

About Polyplastics-Evonik Corporation Ltd.
This company was established in 1970 as a joint venture between Huels AG (now Evonik Industries AG) and Daicel Chemical Industries, Ltd. (now Daicel Corporation). It has created such high-quality, high-performance polymers as nylon 12 and transparent nylon. In recent years, the company has broadened its product lineup to encompass C8 & C12 alicyclic compounds, polymethyl methacrylate, and super-engineering thermoplastics, and polyether ether ketone. The company leverages new perspectives and ideas in an ongoing drive to improve product quality and reinforce technical services. In December 2021, Daicel Corporation transferred its stake in this company to wholly owned subsidiary Polyplastics Co., Ltd. The company was renamed Polyplastics-Evonik Corporation on April 1, 2022.

About Evonik Industries AG
This company is a world leader in specialty chemicals. It operates in more than 100 countries, and generated sales of 15 billion euros and an operating profit (adjusted EBITDA) of 2.38 billion euros in 2021. Evonik goes far beyond chemistry to create innovative, profitable and sustainable solutions for customers. Its more than 33,000 employees share a common purpose of improving life, today and tomorrow.

About Smart Materials Division of Evonik
The Smart Materials division includes businesses with innovative materials that enable resource-saving solutions and replace conventional materials. They are the smart answer to the major challenges of our time: environment,energy efficiency, urbanization, mobility and health. The Smart Materials division generated sales of around €3.92 billion in 2021 with about 7,900 employees.

About Toray Industries, Inc.
This integrated chemical industry company was established in 1926 and operates in 29 countries and regions. It leverages core strengths in organic synthetic chemistry, polymer chemistry, biotechnology, and nanotechnology to supply innovative technologies and advanced materials worldwide across a range of fields. These include fibers and textiles, resins and chemicals, films, carbon fiber composite materials, electronic and information materials, environment and engineering, and life sciences.