Mitsubishi Petrochemical Company Limited

Daiwabo Co., Ltd.

Yasuji Hosono

Koji Nishida

Kazuhisa Tachi

Akihiko Uchikawa

Hideo Nakashima

Yosuke Takai

Takesi Okamoto

There is provided a thermally bonded nonwoven fabric with a unit weight of 10 to 40 g/m.sup.2, comprising 20 to 100% by weight of a composite fiber with a fineness of 0.5 to 8 denier and 80 to 0% by weight of other fibers as the constituent fibers, the composite fiber comprising a first component which is an ethylene-.alpha.-olefin copolymer composition comprising an ethylen-.alpha.-olefin copolymer containing 0.5 to 4% by weight of an .alpha.-olefin having 4 to 12 carbon atoms blended with 0.01 to 0.3% by weight of a phenol type antioxidant and 0.01 to 0.3% by weight of a sulfur type antioxidant, having a Q-value (weight average molecular weight/number average molecular weight) of 4 or less, a density of 0.930 to 0.950 g/cm.sup.3, a melt flow rate of 5 to 50 g/10 min. and an oxidation induction time at 210.degree. C. of 10 min. or longer, and a second component which is a thermoplastic resin having a melting point higher by at least 20.degree. C. than that of the first component, with a constitutional ratio (sectional area ratio) of the first component to the second component being 35:65 to 70:30, said first component of the composite fiber forming at least a proportion of the fiber surface continuously along the length of each fiber and adhering through melting mutually the constituent fibers.

Thermally bonded nonwoven fabric

Growing community of inventors

Yokkaichi, Japan

Yasuji Hosono