Whitish writing and marking fluid for capillary systems and writing instrument

Abstract

A whitish writing and/or marking fluid, in particular white writing and/or marking fluid, for writing instruments, in particular for capillary writing instruments, or for cosmetic applications, that has a viscosity of less than 30 mPa s (Brookfield, 20° C., cone plate CPE-40), and contains 5 to 15 wt % of an anionic dispersion of a hard resin, an aqueous titanium dioxide dispersion, and a preservative.

Claims

1. A whitish writing and/or marking fluid for writing instruments or for cosmetic applications, the whitish writing and/or marking fluid comprising: a viscosity of less than 30 mPa s; an aqueous dispersion of titanium dioxide in an amount of 45 to 70 wt % of a total weight of the whitish writing and/or marking fluid, a solid content of said aqueous dispersion of titanium dioxide being 70 to 75 wt % of said aqueous dispersion; an anionic dispersion of a hard resin in an amount of 5 to 15 wt % of the total weight of the whitish writing and/or marking fluid; a silicone wetting agent in an amount of 1.0 to 3.0 wt % of the total weight of the whitish writing and/or marking fluid; a preservative; and a remainder of water.

2. The writing and/or marking fluid according to claim 1, wherein said aqueous dispersion of titanium dioxide is 50 to 65 wt % of the total weight of the whitish writing and/or marking fluid.

3. The writing and/or marking fluid according to claim 1, wherein said hard resin is a polyurethane polyol resin.

4. The writing and/or marking fluid according to claim 1, wherein at least one of formaldehyde releasers, phenoxyethanol, parabens or isothiazolinones is used as said preservative.

5. The writing and/or marking fluid according to claim 1, wherein said silicone wetting agent is a polyethylene-modified polysiloxane.

6. The writing and/or marking fluid according to claim 1, further comprising further wetting agents including glycerin and/or glycols or polyalcohols.

7. The writing and/or marking fluid according to claim 6, wherein said further wetting agents are added in an amount up to 15 wt % of the total weight of the whitish writing and/or marking fluid.

8. The writing and/or marking fluid according to claim 1, further comprising additives selected from the group consisting of antiblocking additives, colloidal dispersion of silicon dioxide particles, and polyether-modified polydimethylsiloxanes.

9. The writing and/or marking fluid according to claim 8, wherein the additives are added in a total amount of up to 10 wt % of the total weight of the whitish writing and/or marking fluid.

10. The writing and/or marking fluid according to claim 1, further comprising blue dyes or pigments in a concentration of no more than 0.2 wt % of the total weight of the whitish writing and/or marking fluid.

11. The writing and/or marking fluid according to claim 1, further comprising dyes or pigments in a concentration of no more than 3.0 wt % in an amount up to 15 wt % of the total weight of the whitish writing and/or marking fluid.

12. The writing and/or marking fluid according to claim 1, wherein the whitish writing and/or marking fluid is a white writing and/or marking fluid for capillary writing instruments.

13. The writing and/or marking fluid according to claim 1, wherein said aqueous dispersion of titanium dioxide is 55 to 60 wt % of the total weight of the whitish writing and/or marking fluid.

14. A writing instrument, comprising: a writing tip made of a capillary material; a reservoir made of another capillary material; and a writing and/or marking fluid disposed in said reservoir, said writing and/or marking fluid having: a viscosity of less than 30 mPa s; an aqueous dispersion of titanium dioxide in an amount of 45 to 70 wt % of a total weight of the whitish writing and/or marking fluid, a solid content of said aqueous dispersion of titanium dioxide being 70 to 75 wt % of said aqueous dispersion; an anionic dispersion of a hard resin in an amount of 5 to 15 wt % of the total weight of the whitish writing and/or marking fluid; a silicone wetting agent in an amount of 1.0 to 3.0 wt % of the total weight of the whitish writing and/or marking fluid; a preservative; and a remainder of water.

15. The whitish writing and/or marking fluid according to claim 1, wherein said viscosity is less than 30 mPa s when measured at 20° C. with a Brookfield cone and plate viscometer using a cone spindle CPE-40.

16. The writing instrument according to claim 14, wherein said viscosity is less than 30 mPa s when measured at 20° C. with a Brookfield cone and plate viscometer using a cone spindle CPE-40.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) The single FIGURE of the drawing is a diagrammatic, longitudinal sectional view of a capillary writing instrument according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

(2) Referring now to the single FIGURE of the drawing in detail, there is shown a writing instrument, such as a marker, is substantially stylus-shaped and has a shaft 1 in which there is a reservoir 2 is made of a capillary material or a low-density fiber reservoir, such as a polyester fiber reservoir. The front end of the stylus bears a writing tip 3 made of a capillary material, or a fiber tip the rear end of which is connected to or projects into the fiber reservoir 2.

(3) Writing and/or marking fluid is chiefly manufactured in mixing tanks in which the other components, for example colorants or additives, are added to the pigment dispersion. The components are continuously homogenized with a stirrer in order to mix them intensively and distribute them with sufficient evenness. The writing and/or marking fluid thus obtained is then poured into the reservoir 2 of the above-described writing instrument that is made of capillary material.

(4) Seven exemplary formulations for white writing and marking fluids are set forth below. The amounts in the sample formulations are given in wt %.

Example 1

(5) TABLE-US-00002 Demineralized water 27.40 Silicone wetting agent 2.00 Polyether-modified polydimethylsiloxane Formaldehyde releaser 0.40 Isothiazolinone-based preservative 0.20 Glycerin Propylene glycol Polyurethane polyol resin 10.00 Titanium white paste 60.00 Antiblocking additive Additional colorant 100.00

(6) Due to its high titanium white paste content, a writing and/or marking fluid with a composition corresponding to Example 1 has good coverage and good long-term stability.

Example 2

(7) TABLE-US-00003 Demineralized water 24.40 Silicone wetting agent 2.00 Polyether-modified polydimethylsiloxane Formaldehyde releaser 0.40 Isothiazolinone-based preservative 0.20 Glycerin 5.00 Propylene glycol Polyurethane polyol resin 10.00 Titanium white paste 58.00 Antiblocking additive Additional colorant 100.00

(8) A writing and/or marking fluid with a composition corresponding to Example 2 has a high proportion of wetting agent.

Example 3

(9) TABLE-US-00004 Demineralized water 23.40 Silicone wetting agent 2.00 Polyether-modified 1.00 polydimethylsiloxane Formaldehyde releaser 0.40 Isothiazolinone-based preservative 0.20 Glycerin 5.00 Propylene glycol Polyurethane polyol resin 10.00 Titanium white paste 58.00 Antiblocking additive Additional colorant 100.00

(10) A writing and/or marking fluid having a composition according to Example 3 contains a polyether-modified polydimethylsiloxane, which improves substrate wetting and flow, because the surface tension is reduced. This composition allows use on substrates that are difficult to wet.

Example 4

(11) TABLE-US-00005 Demineralized water 21.40 Silicone wetting agent 2.00 Polyether-modified polydimethylsiloxane Formaldehyde releaser 0.40 Isothiazolinone-based preservative 0.20 Glycerin Propylene glycol Polyurethane polyol resin 10.00 Titanium white paste 60.00 Antiblocking additive 6.00 Additional colorant 100.00

(12) A writing and/or marking fluid that has a composition corresponding to Example 4 contains an antiblocking additive, in particular a non-sedimenting colloidal dispersion of silicon dioxide nanoparticles. This additive influences drying and improves the adhesion of the writing and/or marking fluid to wood, plastic and metal surfaces while also increasing coverage.

Example 5

(13) TABLE-US-00006 Demineralized water 28.90 Silicone wetting agent 1.00 Polyether-modified 0.50 polydimethylsiloxane Formaldehyde releaser 0.40 Isothiazolinone-based preservative 0.20 Glycerin Propylene glycol 5.00 Polyurethane polyol resin 14.00 Titanium white paste 50.00 Antiblocking additive Additional colorant 100.00

(14) A writing and/or marking fluid with a composition corresponding to Example 5 contains propylene glycol as an alternative wetting agent and a comparatively low proportion of titanium white paste.

Example 6

(15) TABLE-US-00007 Demineralized water 16.40 Silicone wetting agent 3.00 Polyether-modified polydimethylsiloxane Formaldehyde releaser 0.40 Isothiazolinone-based preservative 0.20 Glycerin 7.00 Propylene glycol Polyurethane polyol resin 6.00 Titanium white paste 65.00 Antiblocking additive 2.00 Additional colorant 100.00

(16) A writing and/or marking fluid with a composition corresponding to Example 6 has a high proportion of titanium white paste.

Example 7

(17) TABLE-US-00008 Demineralized water 27.20 Silicone wetting agent 2.00 Polyether-modified polydimethylsiloxane Formaldehyde releaser 0.40 Isothiazolinone 0.20 Glycerin Propylene glycol Polyurethane polyol resin 10.00 Titanium white paste 60.00 Antiblocking additive Additional colorant 0.20 100.00

(18) A writing and/or marking fluid with a composition corresponding to Example 7 has an additional colorant, in this case 0.2 wt % of ultramarine blue. The additional colorant produces a slightly bluish white, which leads to increased brightness.

(19) Product designations/manufacturers:

(20) 1) Evonik Resource Efficiency GmbH, 45127 Essen, Germany

(21) 2) Evonik Industries AG, 45127 Essen, Germany

(22) 3), 4) THOR GmbH, 67346 Speyer, Germany

(23) 5), 6), 7), 8) OMG Borchers GmbH, 40764 Langenfeld, Germany

(24) 9) BYK-Chemie GmbH, 46462 Wesel, Germany