METHOD FOR PRODUCING PAINTS BY MEANS OF MIXING FLUID PRODUCTS

Abstract

In a method for producing paints by means of mixing fluid products, there is provided a group of fluid products comprising at least one white paint, containing a predetermined percentage quantity of titanium dioxide, and at least one neutral paint which does not have colorants. There is then provided an empty container which is filled with a predetermined quantity of paint which is obtained by mixing the white paint and the neutral paint at variable proportions between 0% and 100%. There is obtained a resultant paint which has a content of titanium dioxide which is selected between a maximum, corresponding to the content of titanium of the white paint, and 0%, corresponding to the content of titanium of the neutral paint.

Claims

1. A method for producing paints by means of mixing fluid products comprising the following steps: providing a group of fluid products comprising: at least one white paint, containing a predetermined percentage quantity of titanium dioxide; at least one neutral paint which docs n t have coating product comprising the same components of said white paint with the exception of the titanium dioxide; providing an empty container; filling the container with a predetermined quantity of paint which is obtained by mixing the white paint and the neutral coating product at variable proportions between 0% and 100% in order to obtain a resultant paint which has a content of titanium dioxide which is selected between a maximum, corresponding to the content of titanium of the white paint, and 0%, corresponding to the content of titanium of the neutral coating product.

2. A method according to claim 1, wherein the group of fluid products further comprises a plurality of fluid colorant components which are different from each other, the method further comprising the step of adding to the paint resulting from the mixing of from 0% to 100% of the white paint and the neutral coating product a variable proportion of one or more fluid colorant components in order to obtain a resultant paint which is correspondingly coloured.

3. A method according to claim 1, wherein the variable proportions from 0% to 100% of the white paint and the neutral coating product are determined by volume and discharged by a volumetric dispensing device.

4. A method according to claim 1, wherein the white paint and the neutral coating product each comprise at least one binding emulsion, at least a quantity of fillers and at least a quantity of additives, which are compatible in the white paint and the coating product, respectively, in order to promote the compatible mixing thereof during the production of the resultant paint.

5. A method according to claim 1, wherein at the end of the filling operation the container contains a resultant quantity of paint which is equal to or greater than 50 cc.

6. A method according to claim 5, wherein at the end of the filling operation the container contains a quantity of paint which is not greater than 200 cc.

7. (canceled)

Description

DETAILED DESCRIPTION

[0029] In a specific but non-limiting embodiment, the method of the present invention makes provision for a white paint and a neutral paint to be provided.

[0030] The white paint comprises approximately 25% by volume of emulsion, that is to say, of the binding component which confers adhesion on the paint. The emulsion is, for example, based on homopolymer, vinyl copolymer or it is acrylic, styrene-acrylic, silicone-containing, siloxane, acryl-siloxane, or based on other compounds of the generally known type. The white paint further comprises approximately 25% of titanium dioxide TiO.sub.2 which provides it with the white coloration. The white paint further comprises approximately 25% of fillers which confer thickness on the paint. There may be indicated as examples of filler calcium carbonate, kaolin, barium sulphate, dolomite, or other compounds which are known in the sector of paints. The white paint further comprises a small percentage of additives, for example, from 0.1 to 0.4%, which are selected from the group, for example, comprising cellulose, which confers the paintability and distension on the paint, antibacterial substances, for better conservation of the paint, coalescent substances, wetting agents and dispersant substances. The whole is dispersed in water.

[0031] The neutral paint comprises approximately 35% by volume of emulsion, which is compatible with and preferably similar to the emulsion of the white paint. The neutral paint further comprises approximately 40% of fillers which are also compatible with and preferably similar to those of the white paint. The neutral paint further also comprises a small percentage of additives, for example, from 0.1% to 0.4%, which are selected from the group, for example, comprising cellulose, which confers the paintability and distension on the paint, antibacterial substances, for better conservation of the paint, coalescent substances, wetting agents and dispersant substances. The whole is dispersed in water.

[0032] In order to produce a finished paint having a predetermined colour, the white paint and the neutral paint are mixed together in a selected proportion of from 0% to 100% so as to form a finished paint with a predetermined content of titanium dioxide, to which there are added various colorants, generally in small or extremely small quantities, in order to obtain the desired chromatic tonality. At the extremes of the chromatic range, the white paint and the neutral paint are used in a pure state, that is to say, in other words, mixed in proportions of 0% of one and 100% of the other. For example, in order to produce pastel colorations, there is provision for using the white paint, to which there is added small or extremely small quantities of a yellow, red, black colorant, etc.

[0033] For paints having a coloration which is more intense, there is carried out the mixing of the white paint and the neutral paint in predetermined proportions in order to optimize the content of titanium dioxide. For example, if it is desirable to produce an intermediate grey colour, it is possible to mix 50% of the white paint and the neutral paint, obtaining a paint having a final content with approximately 32% of emulsion, approximately 14.5% of titanium dioxide, approximately 34.5% of fillers. That intermediate paint, which is optimized in order to obtain a predetermined chromatic range of a colour chart, is then coloured by a selection of predetermined colorants.

[0034] In the same manner, the white paint and the intermediate paint can be mixed together in any relative proportions, from 0% to 100%, with the sole limitation being given by the minimum resolution of the mixing device, normally a positive-displacement pump. In this manner, it is possible to obtain a paint having a grey tonality with a content of titanium dioxide which is optimized in order to obtain a paint having the desired chromaticity and the predetermined properties involving coverage, adhesion, paintability, etc., and in particular not inferior in terms of quality to the respective characteristics of the white paint, on the one hand, and the neutral paint, on the other hand.

[0035] Advantageously, the resultant quality of the finished paint is predetermined and is not inferior to the quality of the white paint, on the one hand, and the neutral paint, on the other hand. Furthermore, the intermediate quality of the paint resulting from the mixing of the white paint and the neutral paint can be optimized in accordance with the colour to be obtained, without the compromises of the known systems which use bases having a predetermined content of titanium dioxide.

[0036] Naturally, the principle of the invention remaining the same, the forms of embodiment and construction details may be varied widely with respect to those described and illustrated, without thereby departing from the scope of the present invention.