Coating Compositions

Abstract

A coating product comprising an aqueous chromic composition comprising a colour-change component, such as a liquid crystal and a polymer binder dispersed in an aqueous solution. The coating product also contains a colourant which may be dispersed or dissolved in the aqueous composition is provided as a separate aqueous solution comprising the colourant to provide an underlying layer.

Claims

1. A nail coating product comprising an aqueous chromic composition which is substantially free of organic solvent which comprises a colour-change component, a binder dispersed in an aqueous solution and a colourant dispersed or dissolved in the aqueous composition.

2. A nail coating product which is substantially free of organic solvent comprising: i) an aqueous chromic composition comprising a colour-change component and a binder dispersed in an aqueous solution; and ii) a separate aqueous solution comprising a colourant for use with the aqueous chromic composition to provide an underlying layer comprising colourant which underlies a layer comprising the colour-change component.

3. A nail coating product according to claim 1 wherein the colour change component comprises a thermochromic liquid crystal.

4. A nail coating product according to claim 3 wherein the colour change component comprises an encapsulated liquid crystal.

5. A nail coating product according to claim 3 wherein the colourant comprises is water soluble dye.

6. A nail coating product according to claim 3 wherein the colourant is a dark colour selected from black and blue.

7. A nail coating product according to claim 3 wherein the binder is selected from a non-ionic, hydrophobically-modified ethoxylated urethane (HEUR), an acrylic polymer, a styrene/acrylate copolymer, a styrene/acrylate/ammonium methacrylate copolymer, an epoxy resin and a polyurethane.

8. A nail coating product according to claim 3 comprising an aqueous solution containing an encapsulated liquid crystal and a binder dispersed in the aqueous solution and a dark colourant selected from black and blue provided in the said aqueous solution wherein the binder comprises at least one of a non-ionic, hydrophobically-modified ethoxylated urethane (HEUR), a polyurethane, a styrene/acrylate/ammonium methacrylate copolymer and/or an epoxy resin.

9. A nail coating product according to claim 2 which further comprises a separate aqueous top-coat composition comprising a UV absorbing agent and water.

10. A nail coating product according to claim 3 further comprising a rheology modifier.

11. A nail coating product according to claim 10 wherein the rheology modifier comprises a glycol, selected from polyethylene glycol, polypropylene glycol, polybutylene glycol and a C.sub.2 to C.sub.6 alkylene glycol.

12. A nail coating product according to claim 3 comprising encapsulated liquid crystal at a level of 6 to 30% solids based on the composition, a binder at a level of 15 to 30% solids by weight of the composition, a dark colourant selected from black and blue at a level of 0.1 to 10% and a preservative at a level of 0.05 to 5%.

13. A nail coating product according to claim 12 comprising at least one of a wetting agent or viscosity modifier at level of 0.1 to 5%, a UV stabiliser at a level of 0.5 to 20%, a rheology modifier at a level of 0.01 to 5%.

14. A method of providing a nail coating which comprises applying an aqueous chromic composition according claim 1 to a substrate to be coated.

15. A method according to claim 14 which comprises applying an underlying layer to the substrate, drying the underlying layer and then applying the aqueous the said aqueous chromic composition to provide a dried nail coating.

16. A method according to claim 14 further comprising applying to the dried surface of the chromic composition an aqueous top-coat composition comprising a UV absorber and drying the applied top-coat composition.

17. A method according to claim 14 wherein the substrate is selected from keratinous nails, artificial, non-keratinous nails, nail extensions, an existing coating on an underlying keratinous or artificial nail.

18. A process of providing a colourant to a nail comprising: i) applying the aqueous chromic composition to a nail; or ii) applying a separate aqueous solution comprising a colourant to a nail to provide a colourant layer and applying the aqueous chromic composition to the colourant layer.

Description

EXAMPLES

[0094] A number of coating products according to the invention were prepared according to the compositions set out in Table 1 below. The compositions were prepared by mixing the components together. The encapsulated liquid crystal was a 40% aqueous slurry and the water in the slurry provided the aqueous component of the composition.

TABLE-US-00001 TABLE 1 Component % by weight Example 1 Carfil 9235 55 Liquid crystal slurry 40 (40% solids) Carfil 9241 1 Carfil 9240 2 Carbon black 0.5 Germaben II 1 Example 2 Carfil 9235 55 Liquid crystal slurry 40 (added as 40% solids) Carfil 9241 1 Carfil 9240 2 Germaben II 1 Example 3 Syntran 5620CG 60 Hexylene glycol 5 Worlee micromer C50/25 1 Liquid crystal slurry 30 (added as 40% solids) Germaben II 1 Example 4 Carfil 9235 50 Liquid crystal 285 C. 40 (added as 40% solids) Carfil 9241 1 Carfil 9240 2 Germaben II 1 Benzophenone-4 5 Example 5 Syntran 5620CG 50 Carfil 9241 0.5 Hexylene glycol 5 Worlee micromer C50/25 1 Carbon black 0.5 Liquid crystal slurry 40 (40% solids) Germaben II 1

[0095] CARFIL9235 is an aqueous dispersion of polyurethane-2 comprising 34-36% solids and having a viscosity of <500 mPa.Math.s at 25° C.

[0096] CARFIL 9240 is an aqueous dispersion of polyurethane-2 comprising 25% solids and having a viscosity of 15000 to 20000 mPa.Math.s at 25° C.

[0097] WorleeAquaNail is a polyacrylate dispersion comprising Aqua, Polyacrylate-42, Acetyl Tributyl Citrate, Dibutyl Sebacate, Phenylpropanol, Caprylyl Glycol, Decylene Glycol

[0098] The product of each of Examples 1 to 5 was evenly applied to nails using a standard nail varnish applicator and allowed to dry. The products were then observed and tested for durability by chipping with a pencil leads of different hardness up to a hardness of 2H.

[0099] The product of Example 1 showed excellent colour brightness when applied by brush to a nail and visibly observed. The products of Examples 2 to 4 showed similarly excellent colour brightness and had improved evenness of coating. The composition of Example 3 provided excellent brightness and durability and resistance to chipping. The composition of Example 5 provided excellent brightness and adequate durability, being resistant to chipping with a pencil of hardness H, although less durable than the products of Examples 1 to 4.

[0100] Adhesion of the coating to the nail and chipping was tested using a procedure similar to the Scotch Tape test employed in adhesive coatings ASTM Test D3359-09. All the compositions applied performed satisfactorily in these tests.