DE3919588A1 - Water-based universal correction fluid - Google Patents

Abstract

The water-based correction fluid contains at least one pigment, a film-forming substance and at least one oxidising substance which reacts with dyes of felt-tipped (felt-tip) and fibre-tipped pens and with the ink of ink pens to give unsoluble and/or colourless end products. The latter substance may be at least one hypochlorite - preferably together with a hydroxide - of an alkali metal or of an alkaline earth metal, in a concentration of from 1 to 15%, in particular from 1 to 10%, or at least one perborate and/or percarbonate of an alkali metal, in a concentration of from 1 to 15%, in particular from 1 to 10%, based in each case on the overall mass of the correction fluid.

Description

Correction fluids are used to cover typos, but also to make out the other descriptors Bodies, e.g. B. used for copy purposes.

There are the following basically different types of Correction fluids:

• - Aqueous-based correction agent;
• - Solvent-based correction agent.

The latter are mostly chlorinated hydrocarbons used as the primary solvent, on the one hand due their good dissolving properties for the binders used, on the other hand due to their rapid evaporation the film formed during the correction. Another advantage lies in the incombustibility of the correction fluid, provided that a sufficiently high proportion of chlorinated hydrocarbons given is.

A serious disadvantage of chlorinated hydrocarbons lies in the physiological concern, why of the health Position of the aqueous correction agents of Preference is given.

These are, however, for a number of applications, in particular to cover fonts of the most common Felt and felt-tip pens are not to be used as their fonts be dissolved by the water of the correction agent and the Dyes therefore reach the surface of the correction film, whereby after drying no white correction layer, but the original color of the underlying Font becomes visible. This process is also with "Bleeding" or "bleeding" the font called.

The aim of the invention is to overcome this disadvantage of the aqueous Eliminate correction agents and an aqueous universal correction fluid to create, which also a blurring allowed by writings that were not previously with aqueous Correction means could be made invisible.

This is especially true for the school sector desirable since so far used the more and more Felt and felt pens the use of corrective agents require based on chlorinated hydrocarbons, but what - as already mentioned - from health Reasons is not desirable.

According to the present invention, the desired universal correction fluid created by water, that in addition in the formulation of the aqueous correction agent Substances that are used with the dyes the felt and fiber pen inks react in the aqueous phase and an insoluble and / or colorless end product in the leave dried, cured correction film.

Advantageous developments of the invention are in the plates the dependent claims described. So for example found that this is a series of chemical Substances are suitable, such. B. the hypochlorites of the alkali and Alkaline earth metals, in particular together with their hydroxides. Also suitable are perborates and percarbonates of the alkali metals.

The effect of the substances according to the invention can by Activators are accelerated; in particular are suitable for this purpose acylated compounds.

Examples Parts by weight 1. Mowilith 771 18.5 Bayertitan RKB-2 46 Pigment distributor A 1 isopropanol 6.5 calcium hypochlorite 3.5 Sodium hydroxide 30% 5.0 Texanol 1.5 water  18 100

Parts by weight 2. Mowilith DMC-2 21 Bayertitan RKB-2 42.5 Pigment distributor A 1 tetrapotassiumpyrophosphate 0.5 isopropanol 5.5 sodium hypochlorite 3.7 sodium 6.3 magnesium silicate 8.5 water  11 100

Parts by weight 3. Mowilith DMC-2 15 Ucar AW 850 6 Bayertitan RKB-2 41 Pigment distributor A 1 tetrapotassiumpyrophosphate 0.6 butyldiglycolacetate 2 sodium 6.2 calcium hypochlorite 4.2 aluminosilicate 10 isopropanol 4 water  10 100

The components of the mixture mentioned in the examples are the following products:
Mowilith DMC-2, Mowilith 771: Farbwerke HOECHST AG: Copolymerisatdispersionen aus low molecular weight acrylic or vinyl acid esters;
Bayertitan RKB-2: BAYER AG; Titanium dioxide, rutile type;
Pigment Distributor A: BASF; Dispersing aid, ammonium salt of a polyacrylic acid;
Texanol: Eastman Chemical Comp .; Ester alcohol, serves to lower the MFT (minimum film-forming temperature);
Butyl diglycol acetate: also serves to lower the MFT;
Tetrapotassium pyrophosphate: serves to soften the water and to stabilize the titanium dioxide dispersion;
Ucar AW 850: Union Carbide Corp .; Vinyl resin dispersion;
Isopropanol: used for drying acceleration.

If required by the conditions of production or storage, it is also possible to use commercial defoamers and / or preservatives for plastic dispersions. Such substances are, for example:
Defoamer: Nopco NXZ (Diamond Shamrock Corp.);
Preservative: Preventol D4 (Bayer AG).

Claims (4)

1. correction agent on an aqueous basis, containing at least one film-forming substance and at least one pigment, characterized in that it also contains at least one oxidizing substance in a suitable amount, with dyes of felt and felt pens and fountain pen ink to insoluble and / or colorless end products responding. 2. correction means according to claim 1, characterized that there is at least one hypochlorite - preferably together with a hydroxide - an alkali or alkaline earth metal, in a concentration of 1 to 15%, in particular 1 to 10% (based on the total mass of the correction agent) contains. 3. correction means according to claim 1 or 2, characterized that it is at least one perborate and / or percarbonate an alkali metal, in a concentration of 1 to 15%, in particular 1 to 10% (based on the total mass the correction means). 4. correction means according to one of the preceding claims, characterized in that it further comprises at least one Activator, in particular an acylated compound, preferably in a concentration of 1 to 9% (based on the total mass of the correction agent).