Image transfer method for use with water based dry erase markers
US5900094A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1997 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Aug 1, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB44C1/175
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A washable dry erase coloring composition comprising an acid dye or polymeric dye colorant, a dye vehicle, a release agent, and a dyeblocker additive. The dyeblocker additive is either a sulfonated naphthalene condensation product or a sulfonated phenol-formaldehyde condensation product. The dry erase coloring composition is suitable for use in marking on a whiteboard and enhances fugitivity from skin and fabrics. The dry erase coloring composition may optionally contain a film forming resin. More specifically, the invention is, in one preferred embodiment, a washable erasable whiteboard marker ink comprising an acid dye or polymeric dye, water, a film forming resin, a release agent and a sulfonated phenol-formaldehyde condensation product. In addition, the invention also includes a method of transferring an image from a whiteboard or non-porous surface to paper. This method comprises the steps of: (a) drawing an image on a whiteboard or non-porous surface with a washable coloring composition containing a dyeblocker; (b) applying a moistened paper to the image; (c) rubbing the moistened paper to transfer the image from the whiteboard to the paper; and (d) removing the paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.