Erasable colored pencil lead
US6815471B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2001 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | Apr 9, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D13/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is an erasable colored pencil lead composition comprising, in an embodiment, a colorant, one or more binder resins, an antioxidant, a fibrillatable or fibrillated material, and a filler. Also disclosed is a colored pencil lead composition which produces marks on paper, which are easily erased by ordinary pencil eraser. The mark made using the composition has a cohesive nature that assists in the removal from paper in sheet or film like sections by the use of an ordinary pencil eraser without smearing or leaving a residue. In a preferred embodiment, the composition is free or substantially free of low melting waxes or waxy materials. The colored pencil lead composition may further include a lubricant. Also disclosed is a method for using a colored pencil lead composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.