	US 12,152,158 B2
	Graphite lead or graphite chalk or graphite block, pencil with graphite lead, and method for producing a graphite lead or graphite chalk or graphite block
Reiner Appel, Gnotzheim (DE); Joachim Kinzel, Stein (DE); Silke Bachmann, Nuremberg (DE); and Gerhard Lugert, Nuremberg (DE)
Assigned to FABER-CASTELL AG, Stein (DE)
Filed by FABER-CASTELL AG, Stein (DE)
Filed on Mar. 22, 2021, as Appl. No. 17/208,072.
Claims priority of application No. 20164990 (EP), filed on Mar. 23, 2020.
Prior Publication US 2021/0292589 A1, Sep. 23, 2021
Int. Cl. C09D 13/00 (2006.01); B43K 19/18 (2006.01); B43K 19/02 (2006.01)

CPC C09D 13/00 (2013.01) [B43K 19/18 (2013.01); B43K 19/02 (2013.01)]

13 Claims

1. Graphite lead or graphite chalk or graphite block for drawing and painting, comprising a base body made of a base mass containing at least one cellulose-based binding agent, wherein the binding agent is contained in a proportion between 0.5 and 6% by weight, a filler, and graphite, wherein graphite is contained in a proportion between 4 and 30% by weight, and wherein the base body is impregnated with a waterproof preparation mixture containing at least a mixture of iso-paraffins and n-paraffins or with a water-soluble preparation mixture containing at least a water-soluble emulsifier.