DESC:Field Of Invention
The present invention relates to an oil paint based on indigo dye and a process for preparing the same.

Background Of Invention
Oil painting i.e., painting in oil colors is a medium consisting of pigments suspended in drying oils. The outstanding facility with which fusion of tones or color is achieved makes it unique among fluid painting mediums; at the same time, satisfactory linear treatment and crisp effects are easily obtained. Opaque, transparent, and translucent painting all lie within its range, and it is unsurpassed for textural variation.

Oil paint is a type of slow-drying paint that consists of particles of pigment suspended in a drying oil, commonly used drying oil is linseed oil.

Common pigment types include mineral salts such as white oxides: zinc oxide, titanium dioxide, and the red to yellow cadmium pigments.

Anciently, for indigo pigment, the Indigofera tinctoria plant which thrives in a tropical climate was used. The active ingredient for indigo pigment is found in the leaves. Indigo does not hold up well in an oil base but makes an excellent watercolor paint.

Mostly oil paint color which are available in the market are based on metal oxide pigment and solid in color. The metal oxide pigment is hazardous.

Many of the historical pigments were dangerous, and many pigments still in use are highly toxic. Some of the most poisonous pigments, such as Paris green (copper (II) acetoarsenite) and orpiment (arsenic sulfide), have fallen from use.

Many pigments are toxic to some degree. Commonly used reds and yellows are produced using cadmium, and vermilion red uses natural or synthetic mercuric sulfide or cinnabar. Flake white and Cremnitz white are made with basic lead carbonate. Some intense blue colors, including cobalt blue and cerulean blue, are made with cobalt compounds. Some varieties of cobalt violet are made with cobalt arsenate.

Therefore, there is a need to provide an oil paint, which overcomes the aforesaid deficiencies.

Summary of Invention
The present invention relates to a process to prepare oil paint based on indigo dye comprising the steps of preparing an indigo derivative dye by adding one or more binder to obtain a mixture followed by adding solvent into the mixture to obtain oil paint.

The present invention aims to provide a non-hazardous blue color comprising indigo dye which is cost effective and has a consistent, smooth, buttery and not stringy or long or tacky texture.

Description Of Invention
An embodiment of the present invention discloses a process to prepare oil paint comprising an indigo dye.

Particularly, an indigo derivative dye such as indigo lake is incorporated in the oil paint.

The process comprises of preparation of mixture of binder and pigment or dyes. A solvent is then added to the mixture or the mixture is added to the solvent.

The pigment or dye is selected from an indigo dye such as indigo lake, indigo carmine and other oil soluble dyes or oil compatible dyes, or combination thereof. The amount of indigo derivative dye, preferably indigo lake dye used is 10 to 20 parts of the total composition.

Incorporation of indigo dye into oil paint provides a different tone of blue color and indigo lake dye is food grade color which on comparing to metal oxide pigment, makes the oil paint non-hazardous.

The binder is selected from linseed oil, safflower oil, soybean oil, nut oil, poppy oil and combination of linseed oil and soybean oil. The amount of linseed oil used is 30 to 40 parts of the total composition.

Preferably, an oil such as turpentine oil, mineral spirit and citrus oil is used as a solvent. The viscosity of the paint is modified by the addition of the solvent. The amount of the solvent used is 5 to 20 parts of the total composition.

In further embodiment, the process comprises of adding one or more auxiliary agents which are selected from one or more fillers, one or more dryers or combination thereof.

Fillers such as chalk powder is used to reduce the cost of oil paint and dryers such as red lead, zinc sulphate, lead acetate, manganese dioxide or combination thereof is used as dryer is to optimize the drying time of oil paint.

The amount of filler is 5 to 10 parts of the total composition. The amount of dryer is 5 to 10 parts of the total composition.

In an embodiment, the process of preparing an oil paint having indigo dye comprises the following steps:

1. mixing one or more indigo derivative dye with one or more binder to obtain a mixture;
2. adding solvent into the mixture to obtain oil paint.

Preferably, the process of preparing an oil paint having indigo dye comprises the following steps:

1. mixing indigo lake dye derivative with linseed oil to obtain a mixture;
2. adding turpentine oil into the mixture to obtain oil paint.

More preferably, the process of preparing an oil paint having indigo dye comprises the following steps:

1. mixing 10 to 20 parts of indigo lake dye with 30 to 40 parts of linseed oil to obtain a mixture;
2. adding 5 to 20 parts of turpentine oil into the mixture to obtain oil paint.

An embodiment of the present invention also relates to an oil paint based on indigo dye obtained from the above-mentioned process comprising 10 to 20 parts of indigo lake dye, 30 to 40 parts of linseed oil, 5 to 20 parts of turpentine oil, and optionally 5 to 10 parts of chalk powder and 5 to 10 parts of red lead.

The advantage of oil paints based on indigo dye are as follows:
1. Different tone of blue color is obtained.
2. Indigo lake dye is food grade color and thus, it is non-hazardous, and non-toxic as compared to metal oxide pigment.
3. Less expensive i.e., cost effective.
4. Drying time of oil paint is reduced.
5. The texture of oil paint is consistent, smooth, buttery and not stringy or long or tacky.

With the use of invented oil color, quick drying properties and different hue of the indigo color have been achieved. This oil color is non-toxic.

Examples:
Example 1
20 parts of indigo lake dye was added into 40 parts of linseed oil and stirred rigorously until a mixture was obtained. The mixture obtained was homogenous.

20 parts of turpentine oil was added into the above mixture, preferably as per requirement of viscosity of oil paint. Further, 10 parts of chalk powder and 10 parts of red lead were also added.

Composition of oil paint based on indigo dye obtained from the abovementioned process was as follows:

Components Amount
Linseed Oil 40 parts
Indigo lake dye 20 parts
Turpentine Oil 20 parts
Chalk powder 10 parts
Red lead 10 parts

Example 2:
20 parts of linseed oil, 15 parts of soyabean oil were added to 20 parts of indigo lake dye and stirred rigorously until a mixture was obtained. The mixture obtained was homogenous.

15 parts of turpentine oil was added into the above mixture, preferably, as per requirement of viscosity of oil paint. Further, 10 parts of chalk powder, 10 parts of red lead and 10 parts of manganese oxide were also added.

Composition of oil paint based on indigo dye obtained from the abovementioned process was as follows:

Components Amount
Linseed Oil 20 parts
Soyabean oil 15 parts
Indigo lake dye 20 parts
Turpentine Oil 15 parts
Chalk powder 10 parts
Red lead 10 parts
Manganese oxide 10 parts

Example 3:
10 parts of indigo lake dye and 10 parts of indigo carmine dye were added into 40 parts of linseed oil and stirred rigorously until a mixture was obtained. The mixture obtained was homogenous.

15 parts of turpentine oil was added into the above mixture, preferably, as per requirement of viscosity of oil paint. Further, 10 parts of chalk powder, 10 parts of red lead and 10 parts of manganese oxide were also added.

Composition of oil paint based on indigo dye obtained from the abovementioned process was as follows:

Components Amount
Linseed Oil 40 parts
Indigo lake dye 15 parts
Indigo carmine dye 10 parts
Turpentine Oil 15 parts
Chalk powder 10 parts
Red lead 10 parts
Manganese oxide 10 parts

Example 4:
15 parts of indigo lake dye was added into 30 parts of linseed oil and stirred rigorously until a mixture was obtained. The mixture was homogenous.

15 parts of turpentine oil was added into the above mixture, preferably, as per requirement of viscosity of oil paint. Further, 10 parts of chalk powder, 10 parts of red lead, 10 parts of zinc sulphate, 10 parts of lead acetate were also added.

Composition of oil paint based on indigo dye obtained from the above-mentioned process was as follows:

Components Amount
Linseed Oil 30 parts
Indigo lake dye 15 parts
Turpentine Oil 15 parts
Chalk powder 10 parts
Red lead 10 parts
Zinc sulphate 10 parts
Lead acetate 10 parts

Example 5:
15 parts of indigo lake dye was added into 30 parts of soyabean oil and stirred rigorously until a mixture was obtained. The mixture was homogenous.

15 parts of turpentine oil was added into the above mixture, preferably, as per requirement of viscosity of oil paint. Further, 10 parts of chalk powder, 10 parts of red lead, 10 parts of zinc sulphate, 10 parts of lead acetate were also added.

Composition of oil paint based on indigo dye obtained from the above-mentioned process was as follows:

Components Amount
Soyabean Oil 30 parts
Indigo lake dye 15 parts
Turpentine Oil 15 parts
Chalk powder 10 parts
Red lead 10 parts
Zinc sulphate 10 parts
Lead acetate 10 parts

Example 6:
20 parts of linseed oil and 10 parts of soyabean oil were added to 10 parts of indigo lake dye and 10 parts of indigo carmine dye and stirred rigorously until a mixture was obtained. The mixture was homogenous.

10 parts of turpentine oil and 10 parts of mineral spirit were added into the above mixture, preferably, as per requirement of viscosity of oil paint. Further, 10 parts of chalk powder, and 10 parts of red lead and 10 parts of manganese oxide were also added.

Composition of oil paint based on indigo dye obtained from the abovementioned process was as follows:

Components Amount
Linseed Oil 20 parts
Soyabean oil 10 parts
Indigo lake dye 10 parts
Indigo carmine dye 10 parts
Turpentine Oil 10 parts
Mineral Spirit 10 parts
Chalk powder 10 parts
Red lead 10 parts
Manganese oxide 10 parts

The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to a person skilled in the art, the invention should be construed to include everything within the scope of the disclosure.

,CLAIMS:
1. A process of preparing an oil paint based on an indigo dye, comprising the steps of:
i. mixing one or more indigo derivative dye with one or more binder to obtain a mixture;
ii. adding solvent into the mixture to obtain oil paint.

2. The process as claimed in claim 1, wherein the indigo dye is selected from indigo lake, indigo carmine or combination thereof.

3. The process as claimed in claim 1, wherein the binder is selected from linseed oil, safflower oil, soyabean oil, nut oil, poppy oil, or combination thereof.

4. The process as claimed in claim 1, wherein the binder is linseed oil, soyabean oil or a combination thereof.

5. The process as claimed in claim 1, wherein the solvent is oil selected from turpentine oil, mineral spirit, citrus oil or combination thereof.

6. The process as claimed in claim 1, additionally comprising adding one or more auxiliary agents.

7. The process as claimed in claim 6, wherein auxiliary agents are selected from one or more fillers, one or more dryers.

8. The process as claimed in claim 7, wherein the filler is selected from chalk powder.
9. The process as claimed in claim 7, wherein the dryer is selected from red lead, zinc sulphate, lead acetate, manganese dioxide or combination thereof.

10. The process as claimed in claim 1, comprising 10 to 20 parts of indigo derivative dye, 30 to 40 parts of the binder, 5 to 10 parts of the auxiliary agent, 5 to 10 parts of filler and 5 to 10 parts of dryer.

11. The process as claimed in any one of the claims, wherein the process comprises the steps of:

i. mixing 10 to 20 parts of indigo lake dye with 30 to 40 parts of linseed oil to obtain a mixture;
ii. adding 5 to 20 parts of turpentine oil into the mixture to obtain oil paint.

12. An oil paint obtained from the process as claimed in claims 1 to 11, comprising
30 to 40 parts of linseed oil,
10 to 20 parts of indigo lake dye,
5 to 20 parts of turpentine oil,
5 to 10 parts of filler and
5 to 10 parts of dryer.