MULTILAYER FILM FOR DISPOSABLE BODY WARMER OUTER BAG, AND DISPOSABLE BODY WARMER

• US 20170258632A1
• Filed: 07/30/2015
• Published: 09/14/2017
• Est. Priority Date: 07/31/2014
• Status: Active Grant

• Current Assignee: Kobayashi Pharmaceutical Company Limited
• Original Assignee: Kanaoka Co., Ltd., Kobayashi Pharmaceutical Company Limited
• Inventors: INOUE, Hiroyuki, MIYAZAKI, Takayuki, IGAUE, Tsuyoshi, KOTANI, Yorikazu
• Granted Patent: US 10,952,893 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 2007/0222 made of synthetics, e.g. plastics
• CPC Class Codes: A61F 2007/0258 with a fluid permeable layer
• CPC Class Codes: A61F 7/03 thermophore, i.e. self-heating, e.g. using a chemical reaction
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: B32B 2250/24 All layers being polymeric
• CPC Class Codes: B32B 2250/246 All polymers belonging to those covered by groups B32B27/32 and B32B27/30
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/20 Inorganic coating
• CPC Class Codes: B32B 2255/205 Metallic coating
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 23/08 of synthetic resin
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/31 Heat sealable
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2307/724 Permeability to gases, adsorption
• CPC Class Codes: B32B 2307/7244 Oxygen barrier
• CPC Class Codes: B32B 2307/7246 Water vapor barrier
• CPC Class Codes: B32B 2307/732 Dimensional properties
• CPC Class Codes: B32B 2439/06 Bags, sacks, sachets
• CPC Class Codes: B32B 2439/46 : Bags
• CPC Class Codes: B32B 2571/00 : Protective equipment
• CPC Class Codes: B32B 27/08 : of synthetic resin
• CPC Class Codes: B32B 27/12 : next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/28 : comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• CPC Class Codes: B32B 27/30 : comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/302 : comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/304 : comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/306 : comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/308 : comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/32 : comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/325 : comprising polycycloolefins
• CPC Class Codes: B32B 27/34 : comprising polyamides
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 27/365 : comprising polycarbonates
• CPC Class Codes: B32B 27/40 : comprising polyurethanes
• CPC Class Codes: B32B 3/266 : characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: B32B 37/12 : characterised by using adhesives
• CPC Class Codes: B32B 5/022 : Non-woven fabric
• CPC Class Codes: B32B 5/024 : Woven fabric
• CPC Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B32B 9/00 : Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
• CPC Class Codes: B65D 65/40 : Applications of laminates for particular packaging purposes B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or
• CPC Class Codes: B65D 81/24 : Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with thermal insulation B65D81/38
• CPC Class Codes: C08J 2427/08 : Homopolymers or copolymers of vinylidene chloride
• CPC Class Codes: C08J 7/0423 : with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder
• CPC Class Codes: C08J 7/043 : Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/048 : Forming gas barrier coatings

Abstract

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 layer 10 and a barrier layer 20, the sealant layer 10 and the barrier layer 20 serve as an inner surface and an outer surface of the outer bag, respectively. The sealant layer 10 includes a vapor-deposited layer 12 made by vapor-depositing a metal or metal oxide on at least one surface (upper portion in FIG. 1) of a thermal fusible resin substrate 11. The barrier layer 20 includes a polyvinylidene chloride layer 22 made by coating at least one surface (lower portion in FIG. 1) of a heat-resistant resin substrate 21 with polyvinylidene chloride.

Claims

1. A multilayer film for a disposable body warmer outer bag, comprising:

a vapor-deposited layer made by vapor-depositing a metal or metal oxide on a substrate; and

a polyvinylidene chloride layer made by coating a substrate with polyvinylidene chloride.

2. The multilayer film for a disposable body warmer outer bag according to claim 1, wherein

the vapor-deposited layer is a sealant layer made by vapor-depositing a metal or metal oxide on at least one surface of a thermal fusible resin substrate, and

the polyvinylidene chloride layer is a barrier layer made by coating at least one surface of a heat-resistant resin substrate with polyvinylidene chloride.

3. The multilayer film for a disposable body warmer outer bag according to claim 1, wherein

the vapor-deposited layer is made by vapor-depositing a metal or metal oxide on the substrate or the thermal fusible resin substrate selected from unoriented polypropylene, biaxially oriented polypropylene, unoriented polyethylene, low density polyethylene, medium density polyethylene, high density polyethylene and straight-chain (linear) low density polyethylene.

4. The multilayer film for a disposable body warmer outer bag according to claim 1, wherein

the vapor-deposited layer is made by vapor-depositing aluminum on the substrate or the thermal fusible resin substrate selected from unoriented polypropylene, biaxially oriented polypropylene, unoriented polyethylene, low density polyethylene, medium density polyethylene, high density polyethylene and straight-chain (linear) low density polyethylene, and

the polyvinylidene chloride layer is made by coating the substrate or the heat-resistant resin substrate selected from biaxially oriented polypropylene, biaxially oriented polyethylene terephthalate and biaxially oriented polyamide resins with a polyvinylidene chloride resin.

5. The multilayer film for a disposable body warmer outer bag according to claim 1, further comprising an adhesive layer between the vapor-deposited layer and the polyvinylidene chloride layer.

6. The multilayer film for a disposable body warmer outer bag according to claim 1, comprising an additional resin layer.

7. The multilayer film for a disposable body warmer outer bag according to claim 1, wherein

an oxygen permeability measured at 20°

C. and 90% RH is 1.5 to 5.0 cc/(m²·

day·

atm), and

a water vapor permeability measured at 40°

C. and 90% RH is 0.05 to 1.5 g/(m²·

day).

8. A disposable body warmer made by packaging airtightly an inner bag accommodating an exothermic composition, in an outer bag formed by thermal fusion of the multilayer film for a disposable body warmer outer bag according to claim 1.