Nanotech Ceramics Co., Ltd.

Korea Institute of Footwear Leather Technology

Soyo Enterprise Inc.

Wan-Ouk Kim

Sang-Ok Jeong

Young-Kyong Lee

Kyung-Man Choi

Chang-Won Lee

Ji-Eun Lee

Young-Min Kim

A lightweight helmet shell includes an inner shell formed from a porous expanded plastic layer, and an outer shell, in which the outer shell is formed from a compressed fiber sheet having an apparent density of 0.15 to 0.7 g/cc and an impact absorbability of less than 300 G. The lightweight helmet shell has excellent breathability, is lightweight, and has improved impact absorbability.

Lightweight helmet shell and method for manufacturing the same

The present invention provides an adhesion enhancer and a polymer composition containing the adhesion enhancer for enhancing the adhesion performance of polymer composition substrates to a primer. The adhesion enhancer of the present invention includes an alcohol, a phenol or another organic compound having a hydroxyl group of the alcohol or phenol and another functional group as supported by a porous material, or a master batch prepared by mixing a polymer with the above organic compound as supported on a porous material. The polymer composition substrate obtained by adding more than 0.5 part by weight of the adhesion enhancer based on 100 parts by weight of the polymer to a normal polymer composition shows good adhesion to a primer having an isocyanate group without a separate process of making a coarse surface of the substrate or an abrasion process using an organic solvent.

Adhesion enhancer for polymer composition substrate and polymer composition containing the same

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Seoul, South Korea

Wan-Ouk Kim