Non-erasable pencil lead

Details Non-erasable pencil lead Non-erasable pencil lead

1996-07-31

1998-02-10

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Marking

106 3196, C09D 1300

Patent

active

057164347

ABSTRACT:
Provided is a non-erasable pencil lead for a natural pencil and a mechanical pencil, characterized in that the pores of a baked pencil lead are impregnated with an unsaturated compound containing an unsaturated group having an iodine value of at least 130 or more, wherein an antioxidant, an oxidative polymerization catalyst and/or a photosensitizer can be added in addition to the unsaturated compound.

REFERENCES:
patent: 2273935 (1942-02-01), Chesler
patent: 2566752 (1951-09-01), Van Dusen et al.
patent: 5318622 (1994-06-01), Kitazawa et al.
patent: 5595700 (1997-01-01), Kitazawa

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