A bag is formed in a gusset bag shape, and sections respectively extending along the short-side portions of a pair of front and back principal-surface film portions are each joined together as end joint portions, to thereby seal frozen food inside the bag. In each end joint portion: the pair of V-shape segments of a side-surface film portion, which is folded inward in a V-shape, is not joined together; and an end of the side-surface film portion is joined only to the ends of the pair of front and back principal-surface film portions extending along the respective short-side portions thereof, to thereby form a side joint region formed so as to expand in a V-shape, each side joint region being formed by joining the end of the side-surface film portion and the ends of the respective principal-surface film portions extending along the short-side portion thereof.

Compositions and methods for generating ClO.sub.2 gas are disclosed. A composition that includes a chlorite salt is activated by exposure to ultraviolet light. After an optional storage period, the composition is then exposed to moisture, resulting in the generation of ClO.sub.2 gas. Exemplary compositions include polymers in which the chlorite salt is dispersed. The polymers may be used to form films that can be used to package, e.g., food products, pharmaceutical products, medical devices, and/or laboratory devices. Upon exposure to ultraviolet light and moisture, the packaging releases controlled quantities of ClO.sub.2 gas, which may disinfect and/or deodorize the packaged device or product.

Compositions and methods for generating ClO.sub.2 gas are disclosed. A composition that includes a chlorite salt is activated by exposure to ultraviolet light. After an optional storage period, the composition is then exposed to moisture, resulting in the generation of ClO.sub.2 gas. Exemplary compositions include polymers in which the chlorite salt is dispersed. The polymers may be used to form films that can be used to package, e.g., food products, pharmaceutical products, medical devices, and/or laboratory devices. Upon exposure to ultraviolet light and moisture, the packaging releases controlled quantities of ClO.sub.2 gas, which may disinfect and/or deodorize the packaged device or product.

A battery packaging material that is excellent in electrolytic solution resistance and ink printing characteristics of the surface. A battery packaging material comprising a laminate having at least a protective layer, a base material layer, a barrier layer, and a heat-sealable resin layer in this order, wherein a maximum value A of absorbance detected in an infrared wavenumber range of 2800 to 3000 cm.sup.−1 and a maximum value B of absorbance detected in an infrared wavenumber range of 2200 to 2300 cm.sup.−1 satisfy the relation: 0.05≤B/A≤0.75, as measured from an outermost surface of the protective layer, using attenuated total reflection Fourier transform infrared spectroscopy.

A battery packaging material that is excellent in electrolytic solution resistance and ink printing characteristics of the surface. A battery packaging material comprising a laminate having at least a protective layer, a base material layer, a barrier layer, and a heat-sealable resin layer in this order, wherein a maximum value A of absorbance detected in an infrared wavenumber range of 2800 to 3000 cm.sup.−1 and a maximum value B of absorbance detected in an infrared wavenumber range of 2200 to 2300 cm.sup.−1 satisfy the relation: 0.05≤B/A≤0.75, as measured from an outermost surface of the protective layer, using attenuated total reflection Fourier transform infrared spectroscopy.

The present invention belongs to the field of active polymer materials. Specifically, it relates to an active polystyrene film that has antimicrobial or antioxidant activity and the method of production of said film. It also refers to wrappers, packages and slice separators (interleavers) that comprise said film.

The present invention belongs to the field of active polymer materials. Specifically, it relates to an active polystyrene film that has antimicrobial or antioxidant activity and the method of production of said film. It also refers to wrappers, packages and slice separators (interleavers) that comprise said film.

The present invention is a liquid-repellent film or sheet that exhibits an excellent liquid repellency, and a packaging material using the same. The liquid-repellent film or sheet comprises: a substrate layer (2); an adhesive layer (3) that comprises a thermoplastic resin, and is formed on at least one plane of the substrate layer (2); and a liquid-repellent layer (4) that comprises a resin (6) having a liquid-repellent moiety, and hydrophilic particles (5), and is formed on the surface of the adhesive layer (3).

The present invention is a liquid-repellent film or sheet that exhibits an excellent liquid repellency, and a packaging material using the same. The liquid-repellent film or sheet comprises: a substrate layer (2); an adhesive layer (3) that comprises a thermoplastic resin, and is formed on at least one plane of the substrate layer (2); and a liquid-repellent layer (4) that comprises a resin (6) having a liquid-repellent moiety, and hydrophilic particles (5), and is formed on the surface of the adhesive layer (3).

An object is to provide a barrier material which not only is high in degree of biomass and small in amount of CO.sub.2 emitted, but also has biodegradability and simultaneously has excellent gas barrier property and water vapor barrier property, and which can be suitably used particularly in packaging applications for foods or the like, such as a packaging material, a bag, a paper container, a cardboard box, and a cup. A solution to be provided is a barrier material having an oxygen permeability of 10 ml/m.sup.2.Math.day.Math.atm or less at a temperature of 23° C. and a relative humidity of 0%, and having a total degree of biomass of 50% or more.