Unburned color pencil lead

Details Unburned color pencil lead Unburned color pencil lead

2005-04-05

2005-04-05

Bell, Mark L. (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Marking

C106S031120

Reexamination Certificate

active

06875261

ABSTRACT:
For the improvement of moldability of a lead and bending strength of a lead, a non-calcined lead of a colored pencil contains a colorant, a binder, a body filler, waxes and/or oils, and a hydrophilic surfactant, and as a hydrophilic surfactant, a polyethylene additive of oils is contained. For the improvement of water resistance, a non-calcined lead of a colored pencil contains a colorant, a binder, a body filler, waxes and/or oils, and a hydrophilic surfactant, and further, a water repellent substance. Further, as a non-calcined lead of a colored pencil with easy quality control process, it contains plate type alumina and/or plate type alumina hydrate.

REFERENCES:
patent: 5595700 (1997-01-01), Kitazawa
patent: 5688493 (1997-11-01), Sugawara et al.
patent: 6395076 (2002-05-01), Hashimoto
patent: 6458390 (2002-10-01), Manelski et al.
patent: 6511533 (2003-01-01), Hashimoto
patent: 51-153023 (1976-12-01), None
patent: 59-120668 (1984-07-01), None
patent: 6-157974 (1994-06-01), None
patent: WO 9961537 (1999-02-01), None

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