CS218527B1 - Covering liquid, especially for correcting written and printed errors - Google Patents

Abstract

The invention relates to a covering liquid, especially for correcting errors in written and printed texts. The covering liquid according to the invention is based on available and economically advantageous binders, non-flammable solvents and pigments with high covering power. It is composed of a combination of two binders, namely 0.5 to 10 parts by weight of polyvinyl acetate and 2 to 15 parts by weight of chloroacetate, 40 to 70 parts by weight of chlorinated hydrocarbons with a carbon number of 1 to 3 are used as solvents and finally 15 to 35 parts by weight of pigments. Furthermore, the liquid usually contains up to 15 parts by weight of plasticizers, up to 20 parts by weight of fillers and possibly up to 10 parts by weight of anti-fouling additives.

Description

The invention relates to a covering liquid, in particular for correcting errors in written and printed texts,

When correcting errors in writing or printed text with the usual remedies, the paper is usually damaged, the corrections are not easy to read and in addition they are very laborious.

Presently, cover fluids are known which use a thin film to cover the wrong text, which dries in seconds and the correct text can be written. These coating liquids are generally designed so that the binder is acrylate polymers which are not always available and are economically disadvantageous; Some of the coatings used so far are more difficult to spread. The resulting cover film is not well bonded, which is most evident in larger scale repairs. The bumpy surface of the film makes it particularly difficult to repair by hand writing.

The most important component of the coating liquids are binders, which have a decisive influence on the physical and mechanical properties and chemical resistance of the coating film. Other essential components are solvents which dissolve the binders used, allow easy application of the coating film and its rapid drying. Relationships between binder and solvent content are in terms of the applicability of the coating liquid. very important as they affect the formation of the cover film, castability, drying and thickness of the cover film. A serious component are solvents, which dissolve directly contribute to the degree of covering.

The coating liquid according to the invention is based on available and economically advantageous binders, non-flammable solvents and pigments of high hiding power. It consists of a combination of two binders, 0.5 to 10 wt. % of polyvinyl acetate and 2 to 15 wt. 40 parts to 70 wt. parts of chlorinated hydrocarbons having a carbon number of 1 to 3 and finally from 15 to 35 wt. parts of pigments. Further, the liquid typically contains up to 15 wt. plasticizer parts, up to 20 wt. parts of fillers and optionally up to 10 wt. parts of anti-sedimentation additives.

In the coating liquid according to the invention, two cheap and available binders are used, which in a suitable combination favorably influence its most important properties. The binders used facilitate the wettability of the liquid and have a beneficial effect on the opacity, flexibility and castability of the coating film and its adhesion to the paper. The coating liquid according to the invention contains solvents which have a decisive influence on the rapid drying of the coating film. The opaque liquid contains pigments with high opacity. As a rule, the liquid also contains fillers, antisedimentation additives and plasticizers to extend its useful life. A great advantage of the cover liquid according to the invention is the absolute non-flammability.

The coating liquid can be prepared, for example, by dissolving the binders in solvents, adding pigments, fillers, anti-sedimentants, emollients, and wiping the entire mixture in a suitable friction device, such as a ball mill.

You can quickly and cleanly correct single letters, words, sentences or whole paragraphs of written and printed texts with the covering liquid. It can also be used to repair Indian ink drawings. The resulting cover film can be repaired with all conventional writing instruments used for writing on paper.

The recommended composition of the covering liquid is given in the following examples:

Example 1

0.5 wt. % of polyvinyl acetate

12.0 wt. parts of chlorinated rubber

45.5 wt. % of 1,1,1-trichloroethane

35.0 wt. parts of titanium white rutile 7.0 wt. parts of dibutyl lithium.

Example 1 a d 2

10.0 wt. 2.0 parts by weight of polyvinyl acetate; parts of chlorinated rubber

70.0 wt. parts of trlchlorethylene

18.0 wt. parts of titanium white rutile.

Example 3

6.0 wt. % of polyvinyl acetate 6.0 wt. parts of chlorinated rubber

60.0 wt. parts of trichlorethylene

15.0 wt. parts of titanium white rutile

20.0 wt. parts by weight of barium sulfate 6.0 wt. parts of silica.

Example 4

4.0 wt. parts of polyvinyl acetate

10.0 wt. parts of chlorinated rubber

61.0 wt. parts of methylene chloride

23.0 wt. rutile titanium dioxide 2.0 wt. parts of silica.

Example 5

8,0 wt. parts of polyvinyl acetate

4.0 wt. parts of chlorinated rubber

63.0 wt. parts of 1,1,1-trichloroethane

16.0 wt. parts of titanium white rutile

15.0 wt. parts of barium sulfate.

Example 6

3.0 wt. parts of polyvinyl acetate

3.0 wt. parts of chlorinated rubber

50.0 wt. parts of methylene chloride

22.0 wt. parts of titanium white rutile

4.0 wt. parts of barium sulfate

10.0 wt. parts of silica

8,0 wt. parts of dibutyl lithium.

$ 333Γ · ~ ·

Example 7

2.0 wt. % polyvinyl acetate 15.0 wt. parts of chlorinated rubber

40.0 wt. parts of trichlorethylene 21.0 wt. parts by weight of titanium and rutile whitewash 7.0 wt. parts of silica 15.0 wt. parts of dibutyl phthalate.

Claims (1)

SUBJECT Coating liquid, in particular for correcting errors in written and printed texts, containing binders, solvents, pigments and, as a rule, also fillers, plasticizers and antisedimentants, characterized in that a mixture of 0.5 to 10 wt. parts by weight of polyvinyl acetate with 2 to 15 wt. 40 parts to 70% by weight of the inventive solvent is used as solvent. parts of chlorinated hydrocarbons having a carbon number of 1 to 3, the liquid further comprising 15 to 35 wt. parts of pigments and generally also up to 20 wt. parts of fillers, up to 15 wt. parts of plasticizers and optionally up to 10 wt. parts of antisedimentants.