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US 10,316,208 B2Granted
Pencil for writing or colouring
AssigneeConte
InventorsJulien Gouerec, Philippe Lefebvre
Life of this patent
Estimating the term…
Abstract
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.
Claims20
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 ethyl vinyl acetate (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.
1 more element
Dependencies are inferred from the claim text.