Celanese advances bio-based TPE for foamed footwear

Dallas, Texas – Celanese Corp. has introduced a new bio-based thermoplastic elastomer for use as a foam material in athletic footwear applications.

Copolyester-based Hytrel TPC RS40F2 incorporates a minimum of 20% segregated bio-content, said the company's 24 July press release.

Foamed using a 'physical supercritical fluid' (SCF) process, it "supports the sustainable development objectives of athletic footwear brand owners and manufacturers." 

The SCF process is said to deliver "a unique cell structure with elevated properties and good skin compatibility," and avoids the use of chemical blowing agents. 

Other selling points, the supplier said, include energy-return performance, resilience, thermal  insulation, sound absorption, shock resistance and moisture resistance.

Celanese is collaborating with processor Xingxun Enterprise to manufacture the foamed elastomer – the companies having worked together to develop the shoe sole production process.