Washable solid marking composition
US4978390A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1988 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Oct 27, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D13/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention is a solid marking composition which may be in the form of, for example, a crayon or a marking pencil lead which is washable from fabrics, wallpaper, and painted surfaces and which also has working properties which closely approximate those achieved in conventional crayons. The composition includes a polyethylene glycol resin having a molecular weight of at least about 7,000, a water soluble surfactant which is other than a liquid at room temperatue, and a pigment. Optionally, the composition of the invention may include one or more of a compatible viscosity modifier, a compatible plasticizer, an antifoam agent, and an inert filler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.