Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1994-10-12
1997-01-21
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
106 26A, 106 25A, 106 19B, 26421111, 26421112, 264349, B43K 1902, C09D 1300
Patent
active
055957005
ABSTRACT:
Non-baked color pencil leads are obtained by forming a blend composition from a filler, a coloring agent, a binder without any wax, and a water/oil repellant substance, kneading the mixture with a solvent and/or plasticizer, extruding the kneaded material, drying the extruded articles to remove the solvent and/or plasticizer therefrom to form open pores therein owing to the less wettability of the water/oil repellant substance, and then impregnating the pores with an oil, a fat and/or a wax. Since the oil, the fat and/or the wax is not blended into the composition, bleeding does not occur at the time of the drying, which permits drying the articles at a high temperature for a short period of time, whereby the manufacturing cost can be decreased. The thus obtained non-baked color pencil leads are remarkably excellent in physical properties such as bending strength and pointed end strength and have a smooth writing performance.
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Mitsubishi Pencil Kabushiki Kaisha
Vargot Mathieu D.
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