Mitsubishi Plastics, Inc.

Mitsubishi Chemical Corporation

Tooru Hachisuka

Shigenobu Yoshida

Chiharu Okawara

Soko Yamagami

Yoshinori Kobayashi

Kenji Ito

Koji Yamauchi

Hisashi Togashi

Shigeto Kimura

Yasushi Sasaoka

Motoyoshi Takemura

Kouichi Hirata

Such a vapor-deposited barrier film is provided that has a vapor-deposited layer having uniform film quality, a high film density and high barrier performance in the initial stage. The vapor-deposited barrier film contains a substrate having on at least one surface thereof at least one layer of a vapor-deposited layer (a). The vapor-deposited layer (a) contains a metal oxide, has a thickness of from 10 to 500 nm, and has an average value of an elemental ratio of oxygen (O) and the metal (oxygen (O)/metal) of 1.20 or more and 1.90 or less and a difference between the maximum value and the minimum value of the (oxygen (O)/metal) of 0.35 or less on analysis of the vapor-deposited layer in the depth direction thereof by an X-ray photoelectron spectroscopy (ESCA) method.

Vapor-deposited film having barrier performance

In the gas-barrier laminate having an inorganic thin layer formed on at least one surface of a substrate having a polyethylene naphthalate layer, provided by the present invention is a gas-barrier laminate having not only high water vapor barrier property and oxygen barrier property abut also excellent adhesion between the substrate and the inorganic thin layer. The said gas-barrier laminate, comprising: a substrate comprising a polyethylene naphthalate layer; a layer formed from a composition comprising an acryl polyol and an isocyanate compound on at least one surface of the substrate; and an inorganic thin layer, arranged in the stated order.

Gas-barrier laminate

Provided is a film which can be industrially coated easily and exhibits excellent gas barrier performance without being subjected to a high-temperature heat treatment. The film exhibits good gas barrier performance immediately after the production, and maintains the excellent gas barrier performance while exhibiting excellent hot water resistance and printing resistance. More specifically, provided are: a gas barrier laminated film including a resin layer on an inorganic thin film formed on at least one surface of a support film, the resin layer being formed by applying: (1) an aqueous dispersion containing polyvinyl alcohol (a), an ethylene-unsaturated carboxylic acid copolymer (b), and inorganic particles (c); (2) an aqueous dispersion containing an ethylene-unsaturated carboxylic acid copolymer (b), inorganic particles (c), and/or a cross-linking agent (d); or (3) an aqueous dispersion containing polyvinyl alcohol (a), an ethylene-unsaturated carboxylic acid copolymer (b), inorganic particles (c), and a cross-linking agent (d), to the inorganic thin film surface; and a method of producing the gas barrier laminated film.

Gas barrier multilayer film

The present invention relates to a gas-barrier laminate for hydrothermal treatment which comprises a base plastic film, a coating layer formed on at least one surface of the base plastic film, an inorganic thin film formed on a surface of the coating layer which is made of a metal compound, and a heat-sealable plastic film laminated on the inorganic thin film or the base plastic film, wherein the inorganic thin film before laminating the heat-sealable plastic film thereon has a rubbing strength of not less than 20 times as measured under a load of 70 g, and the coating layer has a hardness of 0.15 to 0.40 GPa. The laminate of the present invention is excellent in interlaminar bonding property, hardly undergoes breakage of the inorganic thin film owing to the hydrothermal treatment, and can maintain an excellent gas-barrier property even after subjected to the hydrothermal treatment.

Gas-barrier laminate for hydrothermal treatment

A gas-barrier laminate comprises a plastic substrate (A), an inorganic thin film (B) formed on at least one surface of the plastic substrate (A), and a polyester-based resin layer (C) formed by applying a coating material containing a polyester-based resin on a surface of the inorganic thin film (B), wherein the polyester-based resin has a glass transition temperature of 50 to 70&#xb0; C., a molecular weight of 1500 to 15000 and a hydroxyl value of 10 to 60 mg KOH/g, and the gas-barrier laminate has an oxygen permeability of not more than 5 cc/m/day/atm and a water vapor permeability of not more than 5 g/m/day. The gas-barrier laminate of the present invention is excellent in printability (in particular, gradation printability), is free from deterioration in gas-barrier property, namely is excellent in gas-barrier property, even after providing a printed layer thereon, and further exhibits an excellent adhesion between the plastic substrate (A) and the inorganic thin film (B) even after being subjected to retort treatments.

A gas-barrier laminate with a plastic substrate, an inorganic thin film formed on at least one surface of the plastic substrate, and a coating layer formed by applying a coating material on a surface of the inorganic thin film, wherein said coating layer contains a polyester-based resin having a molecular weight of 3000 to 15000 and a polyurethane-based resin having a molecular weight of 8000 to 30000 at a weight ratio of 5/95 to 95/5, and said gas-barrier laminate has an oxygen permeability of not more than 25 fmol/m/s/Pa; and a gas-barrier laminate comprising a plastic substrate, an inorganic thin film formed on at least one surface of the plastic substrate, and a coating layer formed by applying a coating material on a surface of the inorganic thin film, wherein the gas-barrier laminate exhibits an oxygen permeability of not more than 50 fmol/m/s/Pa as measured with respect to a gas-barrier film obtained by laminating an unstretched polypropylene film having a thickness of 60 &#x3bc;m on the coating layer of the gas-barrier laminate after subjecting the gas-barrier film to hydrothermal treatment at 120&#xb0; C. for 30 min, and the coating layer has either a hardness of 0.1 to 0.5 GPa as measured at 23&#xb0; C. in atmospheric air by a nano-indentation hardness testing method, a hardness of 0.03 to 0.5 GPa as measured at 23&#xb0; C. in water by a nano-indentation hardness testing method, or a ratio of number of carbon atoms derived from carboxyl groups to number of carbon atoms constituting the surface of the coating layer of 0.005 to 0.1.

The gas barrier film of the present invention is a gas barrier film comprising a base material, and an inorganic thin film composed of a silicon oxide film formed on one or both surfaces of the base material, wherein radical density of the Pb center of the silicon oxide film observed by an electron spin resonance method (ESR method) is from 1&#xd7;10to 1&#xd7;10spins/cm, or a gas barrier film comprising a base material, an inorganic thin film containing silicon oxide and the other metal component formed on one or both surfaces of the base material, wherein radical density of the Pb center of the silicon oxide in the inorganic thin film observed by an ESR method is from 13&#xd7;10to 3&#xd7;10spins/mol, and a laminate wherein at least one paper and/or plastic film is laminated on the gas barrier film.

Gas barrier film and gas barrier laminate

The gas barrier film having a thermoplastic polymer film, and an inorganic thin film provided on at least one surface of the thermoplastic polymer film, which gas barrier film is formed by applying, to the inorganic thin film, a solution which contains at least one ion species selected from the group consisting of alkali metal ions, alkaline earth metal ions, and ammonium ions and originating from a low-molecular-weight electrolyte having a molecular weight of 1,000 or less and which has a total ion concentration of the ion species of 1&#xd7;10mol/L or more and less than 10 mol/L and a solution concentration less than a saturation concentration.

Gas barrier film

A gas-barrier laminate comprising a base film, a thin film formed on the base film and comprising a metal compound selected from the group consisting of oxides, carbides and nitrides of metals, and mixtures thereof, and a plastic film formed on the metal compound thin film in which a film obtained by forming the metal compound thin film on the base film is subjected to a heat treatment, and having an oxygen permeability of not more than 2 cc/m/day/atm, wherein when the laminate is subjected to hydrothermal treatment at 120&#xb0; C. for 30 min, a change in oxygen permeability of the laminate between before and after the hydrothermal treatment is not more than 5.

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Ibaraki, Japan

Tooru Hachisuka