Unburned color pencil lead
AssigneeSakura Color Products Corporation
InventorsYuka Hashimoto, Hiroki Nishino
Life of this patent
Estimating the term…
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.
Claims13
A non-calcined lead of a colored pencil comprising a colorant, a binder, a body filler, waxes and/or oils, and a hydrophilic surfactant, wherein a polyoxyethylene additive of oils is contained as said hydrophilic surfactant.
A non-calcined lead of a colored pencil comprising a colorant, a binder, a body filler, waxes and/or oils, and a hydrophilic surfactant, further comprising a water repellent substance.
A non-calcined lead of a colored pencil comprising a plate type alumina and/or a plate type alumina hydrate as a body filler.
Dependencies are inferred from the claim text.