Eraser

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 53/02 (2006.01) B43L 19/00 (2006.01) C08K 3/00 (2006.01)

Patent

CA 2453375

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.

L'invention concerne une composition d'effaçage qui comprend 22 à 41 % en poids d'un copolymère séquencé de styrène-éthylène et de butylène-styrène; 5 à 15 % en poids d'un copolymère d'éthylène-propylène; 30 à 50 % en poids de carbonate de calcium; 10 à 25 % en poids de factice; et 0,1 à 7 % en poids de ponce. La composition d'effaçage de l'invention contient éventuellement jusqu'à 1 % en poids de dioxyde de titane. Elle présente, de préférence, une dureté Shore A comprise entre 70 et 85.

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