It started in Japan. Sumitomo had developed a technology essentially to impregnate a polyethylene-based fiber with organic insecticide, so you could create a bed net, a malaria bed net, that would last five years and not need to be re-dipped.
始まりは日本でした　住友化学がポリエチレン樹脂から出来た繊維に 有機殺虫剤を練りこむ技術を開発し それで ベットカーテンをつくれば 蚊帳として５年の防虫効果があります