Eraser
US6441091B1 · kind B1 · utility
2Cited by
9References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2001 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Jul 27, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L53/025
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An eraser composition comprising 22-41 wt % styrene-ethylene/butylene-styrene block copolymer, 5-15 wt % ethylene/propylene copolymer, 30-50 wt % calcium carbonate, 10-25 wt % factice; and 0.1-7 wt % pumice is provided. The eraser composition optionally contains up to 1 wt % titanium dioxide. The eraser composition preferably has a hardness of from 70 to 85 Shore A.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.