Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring

Patent metadata

Field	Value
Publication number	US-2022055396-A1
Application number	US-201917415541-A
Country	US
Kind code	A1
Filing date	Dec 17, 2019
Priority date	Dec 18, 2018
Publication date	Feb 24, 2022
Grant date	—

Abstract

There is a lead casing for pencil for writing, drawing, marking, plotting, and/or coloring made of a composition having, by weight relative to the total weight of the lead casing for pencil: a) from 50 to 95% of a mixture of polylactic acid and polybutylene adipate terephtalate in a weight ratio polylactic acid/polybutylene adipate terephtalate ranging from 60/40 to 90/10, and b) from 5 to 40% of mineral fillers chosen in the group consisting of shellfish shells, more specifically oyster shells, and even more specifically milled oyster shells.There is also a pencil including the lead casing for the pencil of the disclosure, for writing, drawing, marking, plotting, and/or coloring as well as a method for manufacturing such a pencil.

First claim

1 - 12 . (canceled)

13 . A lead casing for a pencil, comprising a composition including, by weight relative to the total weight of the lead casing for the pencil:
a) from 50 to 95% of a mixture of polylactic acid and polybutylene adipate terephtalate in a weight ratio polylactic acid/polybutylene adipate terephtalate ranging from 60/40 to 90/10, and b) from 5 to 40% of mineral fillers selected from the group consisting of shellfish shells.

14 . A lead casing for the pencil according to claim 13 , comprising, by weight relative to the total weight of the lead casing for the pencil:
a) from 60 to 95%, of a mixture of polylactic acid and polybutylene adipate terephtalate in a weight ratio polylactic acid/polybutylene adipate terephtalate ranging from 60/40 to 90/10, and b) from 7 to 30%, of mineral fillers selected from the group consisting of shellfish shells.

15 . The lead casing for the pencil according to claim 13 , comprising, by weight relative to the total weight of the lead casing for the pencil:
a) from 80 to 90% of a mixture of polylactic acid and polybutylene adipate terephtalate in a weight ratio polylactic acid/polybutylene adipate terephtalate ranging from 65/35 to 85/15, and b) from 10 to 20% of mineral fillers selected from the group consisting of shellfish shells.

16 . A lead casing for the pencil according to claim 13 , wherein the weight ratio polylactic acid/polybutylene adipate terephthalate is ranging from 65/45 to 80/20.

17 . The lead casing for the pencil according to claim 13 , wherein the mineral fillers are oyster shells.

18 . The lead casing for the pencil according to claim 13 , wherein the oyster shells are milled oyster shells.

19 . The lead casing for the pencil according to claim 13 , wherein it further comprises an additional filler.

20 . The lead casing for the pencil according to claim 19 , wherein the additional filler is selected from the group consisting of vegetable fillers.

21 . The lead casing for the pencil according to claim 19 , wherein the additional filler is wood fibers.

22 . The lead casing for the pencil according to claim 13 , wherein the total content of filler ranges from 5 to 50%, by weight with respect to the total weight of the lead casing.

23 . The lead casing for the pencil according to claim 13 , wherein the total content of filler ranges from 8 to 30%, by weight with respect to total weight of the lead casing for the pencil.

24 . The lead casing for the pencil according to claim 13 , wherein the content of mineral filler ranges from 5 to 40% by weight, relative to the total weight of the lead casing.

25 . The lead casing for the pencil according to claim 13 , further comprising at least one additive selected from the group consisting of dyes, pigments, blowing agent, agents for use, lubricants, slip agents, performance modifiers of polylactic acid, and their mixtures.

26 . The lead casing for the pencil according to claim 13 , wherein the additive represents from 0.1 to 10% by weight relative to the total weight of the lead casing for the pencil.

27 . The lead casing for the pencil according to claim 13 , further comprising an adhesion promoter.

28 . The lead casing for the pencil according to claim 27 , wherein the adhesion promoter is a polylactic acid grafted with maleic anhydride (PLA-MA).

29 . A pencil comprising a lead casing for the pencil according to of claim 13 surrounding a lead.

30 . The pencil according to claim 29 , wherein the lead includes at least graphite and/or pigments.

31 . The pencil according to claim 29 , being a graphite pencil and/or a colored pencil.

32 . A method for manufacturing a pencil according to claim 29 , wherein the constituents of the lead casing for the pencil are coextruded around the constituents of the lead.

Assignees

• SOCIéTé BIC

Inventors

• Gouerec I Julien

Classifications

• B43K19/02 Primary

  Pencils with graphite; Coloured pencils · CPC title

• B29C48/681

  for single screws · CPC title

• B29C48/022

  characterised by the choice of material · CPC title

• B43K19/14

  Sheathings · CPC title

• B43K19/16

  Making non-propelling pencils (making slate-pencil writing-cores B28D) · CPC title