Erasable marking composition
US6706783B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2001 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Feb 5, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A water-based, erasable marking composition comprising 1-86% by weight water, 0.3-38% by weight pigment, 13-45% by weight polyurethane, and 0-85% by weight glycerin, wherein said polyurethane has a viscosity which increases by at least a factor of 10 when said polyurethane is dried from a 30% dispersion of said polyurethane in water to a 65% polyurethane dispersion in water. The present invention also includes an application instrument comprising an outer body having a first end, an applicator at the first end of the outer body, a reservoir included within the outer body and in fluid communication with the applicator, and a water-based, erasable marking composition within the reservoir. The water-based, erasable marking composition comprises the composition of the invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.