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US 6,441,091 B1Granted
Eraser
AssigneeBinney & Smith Inc.
InventorsJacob Leidner, David G. Cook, Luis Rodrigo Pineiro
Life of this patent
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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.
Claims18
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.
3 more elements
An eraser composition comprising:
- 22-41 wt % styrene-ethylene/butylene-styrene block copolymer;
- 7-9 wt % ethylene/propylene copolymer;
- 30-50 wt % calcium carbonate;
- 17-19 wt % factice;
- 0.1-7 wt % pumice;
- and
- 0.1-1 wt % titanium dioxide.
4 more elements
An eraser composition comprising:
- 32 wt % styrene-ethylene/butylene-styrene block copolymer;
- 7.7 wt % ethylene/propylene copolymer;
- 39.3 wt % calcium carbonate;
- 17.8 wt % factice;
- 2.2 wt % pumice;
- and
- 1 wt % titanium dioxide.
4 more elements
Dependencies are inferred from the claim text.