Kobayashi Pharmaceutical Co., Ltd.

Sekisui Chemical Co., Ltd.

Yuki Sakurai

Tsuyoshi Igaue

Shotaro Kobaru

An outer bag for disposable body warmer packaging and a disposable body warmer are provided that are excellent in a gas barrier property that inhibits permeation of oxygen gas, water vapor and the like, which can allow swelling due to hydrogen gas generated during a storage period to be prevented. Provided is an outer bag for disposable body warmer packaging having an accommodating portion accommodating a disposable body warmer accommodated in an air-permeable inner bag and generating heat through contact with air, the outer bag comprising a low air-permeability portion having an oxygen permeability of 1.5 to 20 cc/m&#xb7;day&#xb7;atm measured at 20&#xb0; C. and 90% RH and a water vapor permeability of 0.05 to 10 g/m&#xb7;day measured at 40&#xb0; C. and 90% RH; and an air-impermeable portion having an oxygen permeability of 1.3 cc/m&#xb7;day&#xb7;atm or lower measured at 20&#xb0; C. and 90% RH and a water vapor permeability of 2.0 g/m&#xb7;day or lower measured at 40&#xb0; C. and 90% RH,

Outer bag for disposable body warmer packaging and disposable body warmer

An outer bag for disposable body warmer packaging and a disposable body warmer are provided that are excellent in a gas barrier property that inhibits permeation of oxygen gas, water vapor, and the like, which can allow swelling due to hydrogen gas generated during a storage period to be prevented. Provided is an outer bag for disposable body warmer packaging having an accommodating portion accommodating a disposable body warmer accommodated in an air-permeable inner bag and generating heat through contact with air, the outer bag comprising a low air-permeability portion having an oxygen permeability of 1.5 to 20 cc/m&#xb7;day&#xb7;atm measured at 20&#xb0; C. and 90% RH and having a water vapor permeability of 0.05 to 10 g/m&#xb7;day measured at 40&#xb0; C. and 90% RH; and an air-impermeable portion having an oxygen permeability of 1.3 cc/m&#xb7;day&#xb7;atm or lower measured at 20&#xb0; C. and 90% RH and a water vapor permeability of 2.0 g/m&#xb7;day or lower measured at 40&#xb0; C. and 90% RH, wherein a ratio of an area of the low air-permeability portion to a total internal area of the accommodating portion is 15 to 75%.

The present invention provides a propylene-based resin microporous film which has excellent electrolyte solution retention property, and can provide a lithium ion battery in which a decrease in discharge capacity is highly reduced even after repeated charge and discharge. The propylene-based resin microporous film is a propylene-based resin microporous film having micropores, wherein a propylene-based resin having a weight average molecular weight of 250,000 to 500,000, a melting point of 160 to 170&#xb0; C., and a pentad fraction of 96% or more is contained, the surface aperture ratio is 27 to 42%, the ratio of a surface aperture ratio to a porosity is 0.6 or less, and the degree of gas permeability is 50 to 400 s/100 mL.

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Osaka, Japan

Yuki Sakurai