The present invention relates to a high strength polyester fiber for a seat belt, and in particular, to a polyester fiber for a seat belt having intrinsic viscosity of 0.8 to 1.5 dl/g, tensile strength of 8.8 g/d or more, and total fineness of 400 to 1800 ...

A porous film is provided that excels, when used as a separator for a lithium-ion battery, not only in separator followability to expansion and contraction of an electrode during charging and discharging, but also in charging and discharging cycle characte...

In order to provide a porous polypropylene film in which the ratio of change in air permeability is small and the initial air-permeating property is satisfactory even under high temperature environment, a porous polypropylene film is proposed, satisfying t...

Regarding a polypropylene series resin porous film having a polypropylene series resin as the main component, so as to exert excellent slipping ability and processability when used as a battery separator, a polypropylene series resin porous film fabricated...

This invention is a porous polypropylene film, in which the number of such portions where the quantity of light transmitted through each portion is not smaller than 5 times the average quantity of light transmitted through the film is 0.5 portion or less p...

Disclosed is a successively biaxially stretched film obtained by successive biaxial stretching method comprising extruding a melt of a beta -crystal nucleating agent-containing polypropylene-based resin composition from a T-die, cooling the extruded resin ...