Enhanced PVOH-based barrier layer composition, barrier layer and methods for its manufacture
US12269242B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 2019 |
| Grant date | Apr 8, 2025 |
| Priority date | — |
| Expiry date | Dec 7, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2439/06
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
There is provided a packaging material comprising a fibre based substrate and a gas barrier layer based on a polyvinyl alcohol (PVOH), wherein said gas barrier layer comprises an interpolymer complex forming agent (IPCFA), which IPCFA is a water-soluble polymer exhibiting functional groups capable of forming hydrogen bonds with —OH groups of the PVOH. Said PVOH has a weight average molecular weight (Mw) measured according to ASTM D4001-13 in the range of about 80 kg/mol to 135 kg/mol, the proportion of said IPCFA to PVOH in said gas barrier layer is in the range of 0.5 to 7.0% (w/w) and said packaging material has an oxygen permeability (OP) below 14 ml μm/m2 day atm, which OP is obtained by multiplying the oxygen transmission rate (OTR) of the packaging material measured according to ASTM F1927-7 at a relative humidity (RH) of 80% and 23° C. by the thickness of the gas barrier layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.