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US 2026/0233438 A1Published application
Thermoplastic polyurethane shoe-sole comprised hydrophobic nano silica by supercritical physical foaming
AssigneeSam Bu Fine Chemical Co., Ltd.
InventorHeedae PARK
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Abstract
This invention is related to a TPU shoe sole (midsole/insole) manufactured by supercritical physical foaming by incorporating hydrophobic nano-silica powder as a foaming nucleating agent to uniformly form microscopic foaming cells during the molding process, thereby achieving a soft touch, high elasticity, and comfortable fit, as well as excellent shape stability and durability, while also enabling lightweight products and reduced material costs.
Claims3
A thermoplastic polyurethane (TPU) shoe sole comprising:
- TPU resin composed of polyol, isocyanate, and chain extender as raw materials,
- wherein the TPU resin comprises hydrophobic nano-silica powder with primary particle sizes of 1 to 100 nm and in a range of 0.1 to 5 parts per hundred resin (phr),
- wherein the hydrophobic nano-silica powder forms nano-silica aggregates with an average size of 100 to 1,200 nm,
- wherein the TPU resin is in a foamed molded foam with a specific gravity in a range of 0.07 to 0.17.
1 more element
Dependencies are inferred from the claim text.