Washable paint composition

Abstract

There is disclosed a washable paint composition suitable for use by children. The composition includes one or more pigments, specific extender pigments, alkali soluble thickeners and non-volatile neutralisers in an amount that allows the paint composition, should it come in contact with a cotton based textile, to be solubilised in a water solution and washed from the textile without leaving a stain.

Claims

1. A resoluble paint composition consisting essentially of: a) one or more pigments in an amount of 3-40 kg per 200 L of the resoluble paint composition; b) one or more acrylic alkali soluble thickeners in an amount of 10-25 kg per 200 L of the resoluble paint composition; c) one or more surfactants; d) one or more extender pigments in an amount of 1-30 kg per 200 L of the resoluble paint composition, wherein the one or more extender pigments is selected from diatomite or a mixture of diatomite and amorphous calcium carbonate; and e) one or more non-volatile neutralisers selected from potassium hydroxide and sodium hydroxide, wherein the non-volatile neutraliser is present in an amount to adjust the resoluble paint composition to a pH of about 8.5-9; wherein the resoluble paint composition provides the same chromatic intensity in both the wet and dry state.

2. The resoluble paint composition of claim 1 wherein the one or more acrylic alkali soluble thickeners is present in an amount of about 15-20 kg per 200 L of the resoluble paint composition.

3. The resoluble paint composition of claim 1 wherein the one or more pigments is present in an amount of 3-25 kg per 200 L of the resoluble paint composition.

4. The resoluble paint composition of claim 1 wherein the one or more extender pigments is diatomite.

5. The resoluble paint composition of claim 1 wherein the one or more extender pigments is diatomite present in an amount of about 10-30 kg per 200 L of the resoluble paint composition.

6. The resoluble paint composition of claim 1 wherein the one or more extender pigments is a mixture of diatomite and amorphous calcium carbonate, wherein the ratio of diatomite to amorphous calcium carbonate is about 1:2.

7. The resoluble paint composition of claim 1 wherein the non-volatile neutraliser is KOH.

8. The resoluble paint composition of claim 1 wherein the surfactant is one or more non-ionic and/or anionic surfactants.

9. The resoluble paint composition of claim 1 wherein the surfactant is a non-ionic surfactant.

10. The resoluble paint composition of claim 1 comprising: one or more acrylic alkali soluble thickeners in an amount of 16-18 kg per 200 L of the resoluble paint composition; c) a non-ionic and anionic surfactant; d) an extender pigment that is diatomite in an amount of 10-30 kg per 200 L of the resoluble paint composition; and e) KOH in amount to adjust the pH of the resoluble paint composition to a range of 8.5-9; wherein the resoluble paint composition is made up to volume with water.

11. The resoluble paint composition of claim 1 wherein the one or more pigments, one or more acrylic alkali thickeners, one or more surfactants, one or more extender pigments and one or more non-volatile neutralisers are present in an amount that allows the resoluble paint composition to remain in a re-wettable and hygroscopic state; and wherein the resoluble paint composition is removed from a textile.

12. The resoluble paint composition of claim 1 wherein the resoluble paint composition is capable of being removed from a cotton textile by resolubilizing the resoluble paint composition with a water solution or a water and detergent solution.

13. A method of solubilising the resoluble paint composition according to claim 1 from a cotton based textile stained with the resoluble paint composition comprising the step of contacting the cotton based textile stained with the resoluble paint composition with a water solution for a period of time sufficient to solubilise the resoluble paint composition.

14. The method of claim 13 wherein the cotton based textile stained with the resoluble paint composition is rinsed one or more times with the water solution to allow removal of the solubilised resoluble paint composition from the cotton based textile.

Description

MODES FOR CARRYING OUT THE INVENTION

(1) In order to better understand the nature of the invention a water based paint composition of the present invention may be formulated as indicated in the following Examples.

EXAMPLES

(2) A paint composition according to one embodiment of the present disclosure is as follows:

(3) a) Pigment: 3-40 kg/200 L.

(4) b) Acrylic thickener/binder:HV30 (anionic polyacrylate copolymer 30% active content, pH 3 density 1.05) 16-25 kg/200 L—at this high level the thickener functions as a binder.

(5) c) about 20 kg of diatomite as pigment extender

(6) d) nonionic surfactant—4 kg/200 L

(7) e) anionic surfactant—sufficient to stabilise and/or disperse the pigment

(8) e) KOH as neutraliser—remains in paint so as to get hygroscopic effect

(9) When the above components are used together in the correct amounts required to release pigment stains from cotton or cotton blend textiles an easily washable paint is obtained. Each colour has a different requirement which must be balanced to give the desired effect.

(10) In general organic pigments with characteristically small particle sizes require the “most treatment”, Pthalo Blue and Methyl Violet requiring the most, while large particle inorganic pigments require less.

(11) The amounts of Celatom needed to render specific colours easily washable varies considerably. The most difficult colour to balance is Pthalo Blue (PB15.3) because it needs to dry to a dark tone value and the mixture is 4 kg of dry pigment to 20 kg of Celatom and 20 kg of HV30. The other most difficult colour is Black Oxide where the pigment load is 20 kg of Black Oxide Pigment and 30 kg of Celatom and 20 kg of HV30. Light colours like yellow, orange and warm red can take 25 kg of Celatom with the HV30 reduced to 16-18 kg/200 L in some cases and the pigment load is 4 kg of dry pigment.

(12) Another colour is Ultramarine Blue where the dry pigment load is 20 kg and it requires only 8-10 kg of Celatom and 20 kg of HV30.

(13) In one embodiment, the formula contains dispersed pigments and a solution acrylic thickener used as binder and thickener plus diatomite. The thickeners ASE60 from Dow or HV30 (BASF) are neutralised with potassium hydroxide which is a non-volatile neutralizer and maintains the polymer in a re wettable and hygroscopic condition. Under these the conditions the children's paint which appears to have dried actually remains moist enough to remove most of the stain in running water under the tap, and the residual stain comes out easily in the wash.

(14) The above composition may be prepared by mixing the components according to procedures know in the art.

(15) The commercially available products suitable for the tempera paint compositions disclosed herein are shown in Table 1:

(16) TABLE-US-00001 Ingredient (manufacturer) Ingredient Function Pigments (Chromaflow Technologies Aust) Pigment HV30 (BASF) Thickener/Binder CF-10 (Dow) or Turgitol (ICI) Non-ionic surfactant Sodium hydroxide neutraliser (Sigma Aldrich) Potassium Hydroxide (Redox Chemicals) crystalline neutraliser form Diatomite (EP Minerals, Reno Nevada) extender Tammol 731 (Dow) and CT171 (AIR) Anionic surfactant

(17) The examples shown in Table 2 were made up to 200 L with water. The washable paint compositions in the following Examples comprise: 3-40 Kg colorant pigment 10-30 kg of extender 16-18 kg of HV30 (thickener) Neutralised to pH8.5-9 with potassium hydroxide 4 kg of non-ionic surfactant
made up to 200 litres with water

(18) TABLE-US-00002 TABLE 2 Washable paint formulations according to the present disclosure per 200 litres Thickener Surfactant Ex Pigment Extender HV30 CF10 Neutraliser 1 Yellow: Yellow 14 4 kg and 20 kg Celatom 18 kg 4 kg KOH to pH Titanium White-8 kg 8.5-9. 2 Warm Yellow: as in Ex 1 but 20 kg Celatom 18 kg 4 kg KOH to pH shaded faintly with pigment 8.5-9. red 188 3 Orange - 4 kg pigment orange 25 kg Celatom 16 kg 4 kg KOH to pH 16 8.5-9. 4 Warm Red - 4 kg of PR4 20 kg Celatom 16 kg 4 kg KOH to pH 8.5-9. 5 Cool Red - 3 kg of pigment 20 kg Celatom 16 kg 4 kg KOH to pH red 57.1 8.5-9. 6 Green Deep - 2 kg of pigment 20 kg Celatom/ 18 kg 4 kg KOH to pH green 7 plus 2 kg PY14 8.5-9. 7 Cool Blue - 4 kg of pigment 20 kg Celatom/ 18 kg 4 kg KOH to pH blue 15 8.5-9. 8 Warm Blue - 25 kg of pigment 8 kg Celatom 18 kg 4 kg KOH to pH blue 29 8.5-9. 9 Purple - 25 kg Celatom 18 kg 4 kg KOH to pH 1 kg of pigment violet 27, 8.5-9. 10 Brown - 10 kg of red oxide 25 kg Celatom 18 kg 4 kg KOH to pH pigment 101 and 3 kg of Black 8.5-9. oxide 12 Ultramarine Blue 8-10 kg Celatom 20 kg 4 kg KOH to pH 20 kg 8.5-9. 13 Pthalo Blue (PB15.3) 4 kg 20 kg Celatom 20 kg 4 kg KOH to pH 8.5-9.. 14 Black Oxide pigment 30 kg Celatom 20 kg 4 kg KOH to pH 20 kg 8.5-9. 15 Cool Red - 3 kg of pigment 10 kg Celatom 16 kg 4 kg KOH to pH red 57.1 20 kg amorphous 8.5-9. CaCO.sub.3 16 Pthalo Blue (PB15.3) 4 kg 10 kg Celatom 20 kg 4 kg KOH to pH 20 kg amorphous 8.5-9.. CaCO.sub.3 17 White (titanium dioxide) 20 kg Celetom 25 kg 4 kg KOH to pH 40 kg 8.5-9..

(19) The use of surfactants is as follows: 4 kg of non-ionic surfactant per 200 L for all the colours; the anionic surfactant used for the Celetom is Tammol 731 at 6% on the weight of the Celetom used (which varies); for the inorganic pigments Titanium, black oxide and red oxide, 6% of Tammol 731 is used on the dry pigment weight; for all of the organic pigments used in the other colours, 8-10% Tammol 731 is supplemented with CT171 where needed.

(20) Pthalo Blue is an organic pigment with very high staining power and very small particle size. Ultramarine Blue is an inorganic pigment with fortunately a very large particle size which requires a very small amount of Celatom.

(21) Comparison with Commercially available children's paint products:

(22) 1) “Crayola® Artista 2 Washable”—this is a known water washable children's poster paint composition and was used as a bench mark.

(23) 2) “FAS™ Super Tempera” paint available from Modern Teaching Aids or Fas.

(24) 3) “FAS™ Total Wash” poster paint available from Modern Teaching Aids or Fas.

(25) 4) “Liquitemp® Poster Paint” available from Educational Colours

(26) 5) Composition according to the present disclosure according to Table 2.

(27) Vibrancy

(28) The vibrancy of colour of the above five paint compositions 1)-5) were compared following application of each paint sample to paper. 1)-4) are commercially available. For 5), the pigments tested were pthalo blue, black oxide, red and yellow prepared according to Table 2. The closest commercially available colour was chosen for testing.

(29) The vibrancy of the present washable paint composition 5) was found to be comparable to that of 4) Liquitemp®. The vibrancy of composition 5) was found to be slightly better than the Crayola product 1) and much better than the FAS products 2) and 3).

(30) Washability

(31) The washability of the above 5 paint compositions 1)-5) were tested and compared. 1)-4) are commercially available. For 5), the pigments tested were pthalo blue, black oxide, red and yellow prepared according to Table 2. The closest commercially available colour was chosen for testing.

(32) For each colour the following test was followed:

(33) a) the paint was applied to a cotton textile and left to dry overnight;

(34) b) The resulting paint on the cotton textile was washed with gentle rubbing with hands with running water under a tap;

(35) c) The cotton textile was soaked in a laundry detergent for 2 h, rubbed and left overnight.

(36) d) The cotton textiles were rinsed with water and re-examined

(37) For the Crayola product 1) and the composition disclosed herein 5), all colours were removed from the textile at the end of step d).

(38) For products 2)-4) a colour stain from each colour remained after step d).

(39) Crayola 1) and the composition according to the paint composition of the present disclosure 5) were found to be water washable for a range of colours compared to commercially available products which all left colour stains on the textile.

CONCLUSION

(40) The paint compositions of the present disclosure was found to have both good colour vibrancy and water washability.

(41) Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

(42) It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the above-described embodiments, without departing from the broad general scope of the present disclosure. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.