Body for a writing, tracing, drawing or coloring pencil

Patent metadata

Field	Value
Publication number	US-11718124-B2
Application number	US-201917274325-A
Country	US
Kind code	B2
Filing date	Sep 6, 2019
Priority date	Sep 7, 2018
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A body for a writing, tracing, drawing or coloring pencil has a composition that has, by weight, with respect to a total weight of the body between 50% and 95% of a mixture of polylactic acid and polybutylene succinate in a polylactic acid/polybutylene succinate ratio by weight of between 90/10 and 60/40 and between 5% and 50% of filler that includes an organic filler, such as wood fibers. A writing, tracing, drawing or coloring pencil includes such a body.

First claim

The invention claimed is:

1. A pencil body for a writing, tracing, drawing or coloring pencil, the body having a composition comprising, by weight, with respect to a total weight of the body:
between 50% and 95% of a mixture of polylactic acid and polybutylene succinate in a ratio by weight of polylactic acid/polybutylene succinate that is between 90/10 and 60/40 and
between 5% and 50% of a filler that comprises an organic filler and does not comprise SiO 2 .

2. The pencil body as claimed in claim 1 , wherein the ratio by weight of polylactic acid/polybutylene succinate is between 80/20 and 65/45.

3. The body as claimed in claim 1 , wherein the composition comprises, by weight, with respect to the total weight of the body:
between 70% and 90% of a mixture of polylactic acid and polybutylene succinate in a ratio by weight of polylactic acid/polybutylene succinate that is between 80/20 and 65/45 and
between 10% and 30% of the filler.

4. The pencil body as claimed in claim 1 , wherein the filler is wood fibers.

5. The pencil body as claimed in claim 1 , wherein the filler comprises shellfish shells.

6. The pencil body as claimed in claim 1 , wherein the filler comprises ground oyster shells.

7. The pencil body as claimed in claim 1 , wherein the filler is between 7 and 40%.

8. The pencil body as claimed in claim 1 , wherein the filler is between 8 and 30%.

9. The pencil body as claimed in claim 1 , wherein the filler is between 9 and 20%.

10. The pencil body as claimed in claim 1 , wherein the filler is 10%.

11. The pencil body as claimed in claim 1 , wherein the mixture of polylactic acid/polybutylene succinate is in a ratio between 80/20 and 70/30.

12. The pencil body as claimed in claim 1 , wherein the composition further comprises between 0.1% and 10% by weight of an adhesion agent, with respect to the total weight of the body.

13. The pencil body as claimed in claim 12 , wherein the adhesion agent is polylactic acid grafted by maleic anhydride.

14. The pencil body as claimed in claim 1 , wherein the composition further comprises between 0.1% and 10% by weight of an additive, with respect to the total weight of the body.

15. The pencil body as claimed in claim 14 , wherein the additive is an additive selected from the group consisting of: dyes and/or pigments, blowing agents, processing aids, lubricants, slip agents, modifiers of the performance of the polylactic acid and their mixtures.

16. The pencil body as claimed in claim 1 , wherein the pencil body is extrudable.

17. A writing, tracing, drawing or coloring pencil comprising the pencil body as claimed in claim 1 .

18. The pencil as claimed in claim 17 , wherein the pencil is obtained by extrusion.

19. The pencil as claimed in claim 17 , wherein the pencil is a graphite pencil or a colored pencil.

Assignees

• SOCIéTé BIC

Inventors

• Gouerec Julien

Classifications

• C09D13/00

  Pencil-leads; Crayon compositions; Chalk compositions · CPC title

• B43K19/14 Primary

  Sheathings · CPC title

• C08L67/04

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title

• B43K19/02 Primary

  Pencils with graphite; Coloured pencils · CPC title

• B43K19/16

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