| abstract |
(57) Abstract: To improve SD characteristics and slipperiness of a battery separator by using a porous film containing crosslinked polyolefin and polyethylene as essential components. SOLUTION: Silane group-introduced uncrosslinked PE 30 parts by weight, high density 70 parts by weight of PE and 1.5 parts by weight of the master batch of the crosslinking catalyst are dry blended by a Henschel mixer, and then molded into a film by a T-die extruder to prepare a resin film. This was uniaxially stretched at a stretching rate of 25% at 140% and then at 95 ° C. Is uniaxially stretched in the same direction at a stretching ratio of 160% to produce a porous resin film. This is a heater of 60 ℃, 90% humidity After 24 hours, a cross-linking reaction is performed to prepare a battery separator. As shown in FIG. 1, this battery separator is SD Starting temperature is less than about 130 ° C and about 10 5 above 130 ° C It has a high electric resistance of ~ 10 6 Ω · cm 2 , and this is about 170 ° C. Keep up close. |