Reusable water writing paper, preparation method thereof, and inkless printing device used for same
US10156043B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 2014 |
| Grant date | Dec 18, 2018 |
| Priority date | — |
| Expiry date | Feb 25, 2035 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H25/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a reusable water writing paper, as well as to its production process and an inkless printing device thereof. The reusable water writing paper is consisted of a substrate as structure-support material, a color-displaying component supported on the substrate, and an optional performance-enhancing additive, wherein the color-displaying component is an oxazoline-based hydrochromic dye, which can change color obviously to display characters and/or patterns after contacting with water, and revert to the initial color to disappear the displayed characters and/or patterns after the water is removed, thereby the water writing paper is reusable. The paper is not only suitable for the exercise of writing or drawing with a brush pen, but also can be used for daily writing with a pen. Furthermore, inkless printing also can be achieved by spraying water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.