Multilayer film for disposable body warmer outer bag, and disposable body warmer
US10952893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 2015 |
| Grant date | Mar 23, 2021 |
| Priority date | — |
| Expiry date | Aug 16, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2427/08
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.