Invention Grant
- Patent Title: Colour pencil lead
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Application No.: US15537021Application Date: 2015-12-14
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Publication No.: US09988546B2Publication Date: 2018-06-05
- Inventor: Frédéric D. Claptien , Julien Gouerec , Philippe Lefebvre
- Applicant: CONTE
- Applicant Address: FR Boulogne-sur-Mer
- Assignee: CONTE
- Current Assignee: CONTE
- Current Assignee Address: FR Boulogne-sur-Mer
- Agency: Ohlandt, Greeley, Ruggiero & Perle, L.L.P.
- Priority: FR1462665 20141217
- International Application: PCT/FR2015/053469 WO 20151214
- International Announcement: WO2016/097555 WO 20160623
- Main IPC: C09D13/00
- IPC: C09D13/00 ; B43K19/02 ; B43K19/18

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.
Public/Granted literature
- US20170349775A1 COLOUR PENCIL LEAD Public/Granted day:2017-12-07
Information query
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