Repulpable, water repellant paperboard
US5626945A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1993 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Sep 28, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/282
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The specification discloses paperboard having a water-repellant coating which includes a polymer matrix/wax mixture and is applied to the paperboard as an aqueous formulation. The polymer matrix includes polymer chains which are ionically cross-linked through pendant carboxylic acid groups to provide, together with the wax, a substantially continuous, water-repellant film which more readily breaks down under the alkaline conditions of repulping. The coated board also exhibits improved release characteristics and resistance to blocking, and is particularly well-suited in corrugated box constructions used in shipping containers for perishable food items such as meats, poultry, fishery products, fruits and vegetables.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.