Kobayashi Pharmaceutical Co., Ltd.

Kanaoka Co. Ltd.

Yorikazu Kotani

Hiroyuki Inoue

Takayuki Miyazaki

Tsuyoshi Igaue

To provide a multilayer film for a disposable body warmer outer bag, and a disposable body warmer that are excellent in gas barrier property which inhibits permeation of oxygen gas, water vapor and the like, and that can allow swelling due to hydrogen gas generated during a storage period to be prevented. In a disposable body warmer outer bag formed from a multilayer film including a sealant layerand a barrier layer, the sealant layerand the barrier layerserve as an inner surface and an outer surface of the outer bag, respectively. The sealant layerincludes a vapor-deposited layermade by vapor-depositing a metal or metal oxide on at least one surface (upper portion in FIG.) of a thermal fusible resin substrate. The barrier layerincludes a polyvinylidene chloride layermade by coating at least one surface (lower portion in FIG.) of a heat-resistant resin substratewith polyvinylidene chloride.

Multilayer film for disposable body warmer outer bag, and disposable body warmer

Provided is a multilayer film for a disposable body warmer outer bag, and a disposable body warmer, which are excellent in 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, and which are excellent in seal strength, impact resistance and weather resistance. A disposable body warmer outer bag formed from a multilayer film comprising a first barrier layer () and a second barrier layer (), wherein the first barrier layer () and the second barrier layer () consist of a polyvinylidene chloride layer () or a polyvinylidene chloride layer () obtained by coating at least one surface (upper portion in FIG.) of a heat-resistant resin substrate () or a heat-resistant resin substrate () with polyvinylidene chloride.

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Osaka, Japan

Yorikazu Kotani