Pencil lead composition with magnesium oxysulfate fibrous materi

Details Pencil lead composition with magnesium oxysulfate fibrous materi Pencil lead composition with magnesium oxysulfate fibrous materi

1986-06-13

1987-05-26

Lesmes, George F.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

106 19, 523164, 428364, 428401, B32B 900, C09D 1300, D02G 300

Patent

active

046685723

ABSTRACT:
A pencil lead comprising a binder, a filler and a colorant as essential components, said filler consisting at least partially of a fibrous material of magnesium oxysulfate. This pencil lead has a high bending strength and a stable quality which does not degrade with the lapse of time, and it can write well.

REFERENCES:
patent: 4371632 (1983-02-01), Grossman et al.
patent: 4562230 (1985-12-01), Fukui et al.

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