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公开(公告)号：US10316208B2
公开(公告)日：2019-06-11
申请号：US15537032
申请日：2015-12-14
申请人： CONTE
发明人： Julien Gouerec , Philippe Lefebvre
摘要： The present invention thus relates to a writing or color pencil comprising the following 3 layers obtained by coextrusion a polyolefin-based non-expanded lead, a non-expanded protective intermediate layer surrounding the lead and comprising a mixture of polystyrene and EVA, and an expanded synthetic wood material based on a styrene polymer surrounding the protective intermediate layer, the protective intermediate layer thickness/lead radius ratio being between 0.05 and 0.17, advantageously between 0.07 and 0.15.
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公开(公告)号：US09988546B2
公开(公告)日：2018-06-05
申请号：US15537021
申请日：2015-12-14
申请人： CONTE
摘要： 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.
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公开(公告)号：US10814665B2
公开(公告)日：2020-10-27
申请号：US16311034
申请日：2017-06-20
申请人： CONTE
发明人： Julien Gouerec , Philippe Lefebvre
摘要： A writing or coloring pencil has three layers obtained by co-extrusion, including an unexpanded polymer-based lead, an unexpanded intermediate protective layer surrounding the lead and comprising an ethylene (C1-C4 alkyl) acrylate copolymer, alone or as a blend with a styrene polymer, and an expanded styrene polymer-based synthetic wood material surrounding the intermediate protective layer.
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公开(公告)号：US10308063B2
公开(公告)日：2019-06-04
申请号：US15536999
申请日：2015-12-14
申请人： CONTE
摘要： The present invention concerns an extrudable, unexpanded paper pencil lead, comprising, by weight relative to the total weight of the lead, between 40 and 60%, and advantageously between 44 and 50%, of graphite; between 15 and 40%, and advantageously between 20 and 35%, of a polyolefin; between 5 and 15%, and advantageously between 6 and 10%, of a colorless mineral filler; between 5 and 20%, and advantageously between 5 and 15%, of carbon black coated with or mixed with a polyolefin wax or a polyolefin; between 0 and 16%, and advantageously between 5 and 15%, of an additive. It further concerns the paper pencil comprising a lead according to the invention.
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