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 (Brookfield, 20 C., cone plate CPE-40); 45 to 70 wt % of an aqueous dispersion of titanium dioxide, a solid content of said aqueous dispersion of titanium dioxide is 70 to 75 wt %; 5 to 15 wt % of an anionic dispersion of a hard resin; 1.0 to 3.0 wt % of a silicone wetting agent; and a preservative.

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

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 up to 15 wt % of said further wetting agents is added.

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 %.

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 %.

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 %.

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 %.

14. A writing instrument, comprising: a writing tip made of a capillary material; a reservoir made of a 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 (Brookfield, 20 C., cone plate CPE-40); 45 to 70 wt % of an aqueous dispersion of titanium dioxide, a solid content of said aqueous dispersion of titanium dioxide is 70 to 75 wt %; 5 to 15 wt % of an anionic dispersion of a hard resin; 1.0 to 3.0 wt % of a silicone wetting agent; and a preservative.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0033] 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

[0034] 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.

[0035] 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.

[0036] 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

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

[0037] 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.

[0038] Example 2

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

[0039] A writing and/or marking fluid with a composition corresponding to Example 2 has a high proportion of wetting agent.

[0040] Example 3

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

[0041] 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.

[0042] Example 4

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

[0043] 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.

[0044] Example 5

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

[0045] 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.

[0046] Example 6

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

[0047] A writing and/or marking fluid with a composition corresponding to Example 6 has a high proportion of titanium white paste.

[0048] Example 7

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

[0049] 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.

[0050] Product designations/manufacturers: [0051] 1) Evonik Resource Efficiency GmbH, 45127 Essen, Germany [0052] 2) Evonik Industries AG, 45127 Essen, Germany [0053] 3), 4) THOR GmbH, 67346 Speyer, Germany [0054] 5), 6), 7), 8) OMG Borchers GmbH, 40764 Langenfeld, Germany [0055] 9) BYK-Chemie GmbH, 46462 Wesel, Germany