Search

US-12617959-B2 - Peelable ink composition for non-porous substrates

US12617959B2US 12617959 B2US12617959 B2US 12617959B2US-12617959-B2

Abstract

An aqueous peelable ink composition substrate comprising: (a) at least one film-forming elastomeric polymer, (b) at least one anionic surfactant, (c) at least one coloring agent, and (d) water, wherein the film-forming elastomeric polymer is acrylonitrile butadiene rubber (NBR) and/or hydrogenated acrylonitrile butadiene rubber (HNBR), and a method for preparing such an aqueous peelable ink composition.

Inventors

  • Carine Bethouart

Assignees

  • SOCIéTé BIC

Dates

Publication Date
20260505
Application Date
20210326
Priority Date
20200331

Claims (20)

  1. 1 . An ink composition comprising: (a) at least one film-forming elastomeric polymer, (b) at least one anionic surfactant, (c) at least one coloring agent, and (d) water, wherein the at least one film-forming elastomeric polymer includes hydrogenated acrylonitrile butadiene rubber (HNBR).
  2. 2 . The ink composition according to claim 1 , wherein the ink composition further comprises at least one plasticizer, wherein the at least one plasticizer is selected from the group consisting of polyols, (poly)esters, and mixtures thereof.
  3. 3 . The ink composition according to claim 2 , wherein the at least one plasticizer is selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, glycerin, trimethyl pentanyl diisobutyrate, and mixtures thereof.
  4. 4 . The ink composition according to claim 1 , wherein the at least one anionic surfactant is a salt of fatty acid esters, of sulfonic acid, of phosphoric acid, or a combination thereof.
  5. 5 . The ink composition according to claim 4 , wherein the at least one anionic surfactant is an alkali metal salt of 1,4-diisodecyl sulphonatosuccinate or of deceth-4 phosphate.
  6. 6 . The ink composition according to claim 5 , wherein the at least one anionic surfactant is sodium 1,4-diisodecyl sulphonatosuccinate or potassium deceth-4 phosphate.
  7. 7 . The ink composition according to claim 4 , wherein a content of the at least one anionic surfactant ranges from 0.3% to 2% by weight, relative to a total weight of the ink composition, and wherein anionic surfactant includes a salt of sulfonic acid.
  8. 8 . The ink composition according to claim 1 , wherein the at least one coloring agent is a pigment dispersion, and wherein a content of the at least one coloring agent ranges from 0.1% to 35% by weight, relative to a total weight of the ink composition.
  9. 9 . The ink composition according to claim 1 , wherein a content of the at lest one film-forming elastomeric polymer represents at least 8% by weight, relative to a total weight of the ink composition.
  10. 10 . The ink composition according to claim 1 , wherein a content of the at least one anionic surfactant ranges from 0.1 to 5% by weight, relative to a total weight of the ink composition.
  11. 11 . The ink composition according to claim 10 , wherein a content of the at least one anionic surfactant ranges from 0.3% to 2% by weight, relative to the total weight of the ink composition.
  12. 12 . The ink composition according to claim 1 , wherein a content of water ranges from 10% to 80% by weight, relative to a total weight of the ink composition.
  13. 13 . The ink composition according to claim 1 , wherein a content of the at least one plasticizer ranges from 1% to 25% by weight, relative to a total weight of the ink composition.
  14. 14 . The ink composition according to claim 1 , wherein the ink composition further comprises at least one additive selected from the group consisting of antimicrobial agents, antifungal agents, dispersing agents, wetting agents, pH regulators, and mixtures thereof.
  15. 15 . The ink composition according to claim 1 , wherein the ink composition is configured to form a written mark that is erasable.
  16. 16 . A method for preparing the ink composition according to claim 1 , comprising the steps of: (i) under stirring, adding the at least one film-forming elastomeric polymer to water, (ii) under stirring, adding the at least one anionic surfactant, the at least one coloring agent, and at least one plasticizer, to a mixture obtained in step (i), and (iii) under stirring, adding additive(s) to a mixture obtained in step (ii).
  17. 17 . A writing instrument containing the ink composition according to claim 1 , wherein the writing instrument is a marker, wherein the writing instrument comprises an eraser located on a cap or on a non-writing end of the writing instrument.
  18. 18 . A method for writing on a non-porous substrate, comprising the step of applying the ink composition according to claim 1 on a non-porous substrate, selected from the group consisting of glass, metals selected from the group consisting of aluminum, stainless steel, zinc, tin, and mixtures thereof, and polymer materials selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, and mixtures thereof to form a writing, and erasing by peeling the writing with a finger or with a friction body, wherein the friction body is an eraser or a tissue.
  19. 19 . A film obtained by drying the ink composition according to claim 1 , wherein the film comprises: the at least one film-forming elastomeric polymer, the at least one anionic surfactant, and the at least one coloring agent.
  20. 20 . A non-porous substrate coated with the ink composition according to claim 1 , wherein the non-porous substrate is selected from the group consisting of glass, metals selected from the group consisting of aluminum, stainless steel, zinc, tin, and mixtures thereof, and polymer materials selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, and mixtures thereof.

Description

CROSS REFERENCE TO RELATED APPLICATION This application is a National Stage Application of International Application No. PCT/EP2021/057953, filed on Mar. 26, 2021, now published as WO2021198076 and which claims priority from European Application No. EP20167380.3, filed on Mar. 31, 2020. TECHNICAL FIELD The present disclosure concerns an aqueous peelable ink composition, more specifically a writing ink composition, in particular for non-porous substrates. The disclosure also concerns a method for preparing such an aqueous peelable ink composition. A writing instrument comprising such an aqueous peelable ink composition and a method for writing on a substrate, in particular a non-porous substrate, are also part of the disclosure. The disclosure also concerns a film obtained by drying an ink composition according to the disclosure, and to a method for obtaining such a film. Finally, the disclosure concerns a substrate, in particular a non-porous substrate, coated with an aqueous peelable ink composition or a film according to the disclosure. The aqueous peelable ink composition of the disclosure includes a film-forming elastomeric polymer, an anionic surfactant, as well as a coloring agent dispersed in water. When the ink composition is applied to substrates, more specifically a non-porous substrate, the water evaporates and the polymer provides a coalesced film (also named residue or deposit) on the surface of the substrate. The ink composition is peelable in that the film can be removed from the surface of the substrate, preferably such as glass, metals, and polymer materials, for some period of time after formation without leaving a visible residue or damaging the substrate. Hence, the written mark on a substrate can be removed by peeling (or rubbing) with an eraser to peel the color of the written mark, in particular just after writing. The ink composition of the disclosure is particularly suitable for use with writing surfaces, in particular a non-porous substrate (also named non-porous substrates) such as glass, metals, and polymer materials. The aqueous peelable ink composition of the disclosure is also storage-stable, easy to manufacture, and easy to apply. The ink composition of the disclosure preferably has a low viscosity, preferably a viscosity ranging from 3 to 10 mPa·s, more preferably ranging from 3 to 7 mPa·s, and as a result is particularly suitable for use with standard felt-tip markers that rely on a capillary feed system to draw ink from a reservoir. Thus, the ink composition of the disclosure is particularly suitable for use in markers which typically use colored pigments. BACKGROUND Aqueous erasable writing ink compositions are known in the art such as in JP2003221542 or JP2006022213. Said aqueous ink compositions are based on film-forming polymers and contain colorant. However, with this kind of erasable writing ink compositions, erasability may be difficult after a long period of time, and is thus sometimes not satisfactory. Therefore, there is a need to find a new aqueous erasable ink composition, more specifically a writing ink composition, in particular for non-porous substrates, providing a good deposit as well as a good erasability (peelability). In particular, a good deposit should be understood as good wettability (quality of the deposit) and/or high color opacity and/or vividness. In addition, according to some embodiment, it is advantageous to avoid ink leakage phenomenon in particular during use, or if exposed to a temperature of 37° C. to 50° C. for example, or if a shock occurs on the writing instrument containing the ink. SUMMARY The inventors have surprisingly found that the use of a specific film-forming elastomeric polymer such as acrylonitrile butadiene rubber (NBR) and/or hydrogenated acrylonitrile butadiene rubber (HNBR), in combination with an anionic surfactant and a coloring agent dispersed in water, can lead to an ink composition which solves the above-mentioned problems and which exhibits the aforementioned advantages. The peelable ink composition of the disclosure also presents the advantage of being peelable (and therefore erasable), in particular with an eraser and/or with a tissue and/or with fingers, thus resulting of less waste than with conventional erasers. DETAILED DESCRIPTION Hereinafter, a detailed description of the present disclosure will be given. The specific embodiments are meant better illustrate the present disclosure, however, it should be understood that the present disclosure is not limited to these specific embodiments. In the sense of the present disclosure, the expression “comprising a” should be understood as being synonymous with “comprising at least one”. In the sense of the present disclosure, the expressions “between . . . and . . . ” or “ranging from . . . to . . . ” should be understood as including the values of the limits. For the purposes of the present disclosure, the term “erasable ink” or “peelable ink” is intended to mean any