Eraser

Details Eraser Eraser

2008-03-11

2008-03-11

Cleveland, Michael B. (Department: 1709)

Cleaning and liquid contact with solids

Processes

Using solid work treating agents

C015S003530, C015S424000, C428S304400, C428S308400

Reexamination Certificate

active

07341635

ABSTRACT:
An eraser is constituted by an elastic material containing a rubber component or a resin component, and a skeleton structure for reinforcing the elastic material, and the skeleton structure is made from a porous structural material such as from an organic polymer that is broken when rubbed. Void portions in the porous structural material of the skeleton structure contain the elastic material of the eraser composition. Here, the skeleton portions of the skeleton structure may have an average thickness of 1 to 100 μm, and the void portions may have an average pore size of 10 μm to 3 mm. The eraser may have a surface hardness of 50 to 80, and also a sticking strength of 1.5 to 20 (kgf).

REFERENCES:
patent: 2487903 (1949-11-01), Sturzenegger et al.
patent: 4335033 (1982-06-01), Handl
patent: 4594362 (1986-06-01), Smith et al.
patent: 4911974 (1990-03-01), Shimizu et al.
patent: 4992481 (1991-02-01), Von Bonin et al.
patent: 5366999 (1994-11-01), Giez et al.
patent: 5413853 (1995-05-01), Imashiro et al.
patent: 5716997 (1998-02-01), Toyosawa et al.
patent: 8-258493 (1996-08-01), None

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