Water-dispersible sheet
US11649380B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 15, 2018 |
| Grant date | May 16, 2023 |
| Priority date | — |
| Expiry date | Jul 3, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J2400/283
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A water-dispersible sheet is described that maintains water dispersibility while providing suppressed time degradation of the tacky adhesiveness of a tacky adhesive layer. The water-dispersible sheet has a paper substrate with a multilayer structure. One layer of the multilayer structure is an inner layer that is not in contact with the tacky adhesive layer. Another layer is a surface layer that is in contact with the tacky adhesive layer. The layers independently include mixed pulps of a wood pulp and a refined pulp with an α-cellulose content of 88 % by weight or more. The weight ratio of the layers and the beating degree of the mixed pulps are set in the specific ranges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.