TPU material for manufacturing shoe soles and foaming process therefor

By mixing modified SiO2 nanoparticles with styrene-acrylic resin and EVA grafted with maleic anhydride, a TPU material with excellent wear resistance and resilience was prepared, solving the problems of poor wear resistance of EVA sole material and hard feel of TPU material, and realizing a sole material that is both lightweight and soft.

WO2026055866A1PCT designated stage Publication Date: 2026-03-19CHENG DA VI TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-09-12
Publication Date
2026-03-19

AI Technical Summary

Technical Problem

Existing foamed EVA sole materials have poor abrasion resistance and significant loss of resilience, while TPU materials feel too hard underfoot.

Method used

TPU materials were prepared by using modified SiO2 nanoparticles mixed with styrene-acrylic resin and EVA grafted with maleic anhydride as functional additives and through a specific foaming process, thereby improving the wear resistance and resilience of the materials.

Benefits of technology

The prepared TPU material has excellent abrasion resistance and resilience, while also possessing the lightweight and softness of EVA, meeting the requirements for shoe sole materials.

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Abstract

A TPU material for manufacturing shoe soles and a foaming process therefor. The TPU material comprises: thermoplastic polyurethane (TPU), an ethylene-vinyl acetate (EVA) copolymer, a functional additive, a foaming agent, a cross-linking agent and a foaming accelerator, wherein the functional additive comprises a styrene-acrylic resin, an EVA-grafted maleic anhydride, and modified silicon dioxide.
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Citation Information

Patent Citations

  • Sole high-resilience composition foamed material and preparation method thereof

    CN107698860A

  • Soft light sole material and preparation method thereof

    CN115286862A

  • Modified EVA foaming material for shoe soles and preparation method thereof

    CN117487269A

  • Filled elastomer comprising polyurethane

    US20140142251A1