Colour pencil lead
AssigneeConte
InventorsFrédéric D. Claptien, Julien Gouerec, Philippe Lefebvre
Life of this patent
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Abstract
The present invention concerns an extrudable, unexpanded color pencil lead, comprising, by weight relative to the total weight of the lead: between 25 and 45%, and advantageously between 30 and 40%, of a polyolefin; between 25 and 50%, and advantageously between 30 and 40%, of a colorless mineral filler; between 4 and 20%, and advantageously between 5 and 15%, of a pigment coated with or mixed with a polyolefin wax; between 0 and 10%, and advantageously between 2 and 10%, of an additive, and between 10 and 30%, and advantageously between 15 and 25%, of stearate chosen from magnesium stearate, calcium stearate and the mixture of same. It further concerns the color pencil comprising a lead according to the invention.
Claims18
A non-expanded, extrudable color pencil lead, comprising, on a weight basis relative to the total weight of the lead:
- between 25 and 45% of a polyolefin;
- between 25 and 50% of a colorless mineral filler;
- between 4 and 20% of a pigment coated or mixed with a polyolefin wax;
- between 0 and 10% of an additive and
- between 10 and 30% of stearate selected from the group consisting of magnesium stearate, calcium stearate and a mixture thereof.
Dependencies are inferred from the claim text.