Colored lead or colored chalk, pencil containing a colored lead, and process for preparing a colored lead or colored chalk
AssigneeFaber-Castell AG
InventorsVladimir Barroso, Eder D.J. Merola, Marcel Prado Atassio, Reiner Appel, Gerhard Lugert
Life of this patent
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Abstract
A colored lead for writing, drawing and coloring implements, more particularly erasable, sintered colored lead, or to a colored chalk, more particularly erasable, sintered colored chalk, having a sintered lead or chalk base body which is formed from a lead or chalk base material containing at least one binder with a proportion of from 1 to 25% by weight and at least one filler with a proportion of from 25 to 99% by weight. The sintered lead or chalk base body is impregnated with at least one colorant and at least one lubricant.
Claims20
An erasable, sintered colored lead for writing, drawing and coloring implements or a colored chalk, comprising:
- a sintered lead or chalk base body formed from lead or chalk base material containing at least one binder with a proportion of from 4 to 17% by weight and at least one filler with a proportion of from 25 to 99% by weight;
- at least one colorant;
- at least one lubricant, said sintered lead or chalk base body being impregnated with said least one colorant and said at least one lubricant, said colorant being present in the colored lead or the colored chalk with a proportion of from 0.1 to 10% by weight;
- and
- said at least one filler is selected from the group consisting of boron nitride, a mineral filler, kaolin, talc, calcium carbonate, and clay being present in said lead or chalk base material.
A pencil, comprising:
- a colored lead, containing:
- a sintered lead or chalk base body formed from a lead or chalk base material containing at least one binder with a proportion of from 4 to 17% by weight and at least one filler with a proportion of from 25 to 99% by weight;
- at least one colorant;
- at least one lubricant, said sintered lead or chalk base body being impregnated with said least one colorant and said at least one lubricant, said colorant being present in the colored lead or colored chalk with a proportion of from 0.1 to 10% by weight;
- and
- said at least one filler is selected from the group consisting of boron nitride, a mineral filler, kaolin, talc, calcium carbonate, and clay being present in said lead or chalk base material;
- and
- a sheath composed of a wood or wood plastic compound.
A process for preparing a colored lead or colored chalk, which comprises the following process steps of:
- preparing a sintered chalk or lead base body from a chalk or lead base material containing at least one binder and at least one filler;
- impregnating the sintered chalk or lead base body in a solution containing at least one colorant, wherein the colorant is present in the solution with a proportion of from 1 to 30% by weight;
- and
- impregnating the sintered chalk or lead base body in the solution with at least one lubricant.
Dependencies are inferred from the claim text.