Multi-functional barrier coating for molded fiber containers
US12129602B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2022 |
| Grant date | Oct 29, 2024 |
| Priority date | — |
| Expiry date | Oct 22, 2042 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H19/62
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Coating compositions are disclosed that can be applied to at least a food-facing surface of a molded fiber container to make the coated container suitable for applications involving long term storage of a dry or frozen food item combined with short term contact with the food item in a liquid or moist state. The coating compositions include carboxylated polyvinyl alcohol copolymer and a crosslinking resin that is epichlorohydrin-based and/or azetidinium-functionalized. The compositions can also include clay particles or other suitable fillers. After crosslinking and drying, the compositions form a thermoset barrier coating in which the polyvinyl alcohol is bonded to the crosslinker by a plurality of function groups including ester functional groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.