Coating Compositions

Abstract

A coating composition for coating nails to provide an aesthetic colour-change effect using a liquid crystal. The composition is a gel which is spreadable and contains a curable oligomer and/or, a monomer, a curing initiator and an unsealed liquid crystal.

Claims

1. A coating composition comprising a chromic component comprising a liquid crystal at a level of 30 to 80% by weight of the composition, and a curable oligomer and/or, a monomer and a curing initiator.

2. A coating composition according to claim 1 wherein the oligomer and/or monomer is dissolved or dispersed in a non-aqueous solvent.

3. A coating composition according to claim 1 wherein the liquid crystal comprises a cholesteric liquid crystal and/or a phenyl benzoate esters.

4. A coating composition according to claim 1 wherein the liquid crystal is present at a level of 35 to 75% by weight of the composition.

5. A coating composition according to claim 1 comprising a colourant.

6. A coating composition according to claim 5 wherein the colourant is selected from a static liquid crystal, a dye and a pigment.

7. A coating composition according to claim 5 wherein the colourant comprises a powder or a non-aqueous solution.

8. A coating composition according to claim 1 comprising a chromic component comprising an unsealed liquid crystal, a curable oligomer and/or a monomer and an initiator and a colourant added to the composition in powder form.

9. A coating composition according to claim 1 wherein the curable oligomer and/or curable monomer are polar and immiscible with the liquid crystal.

10. A coating composition according to claim 1 comprising a curable oligomer comprising a urethane.

11. A coating composition according to claim 1 comprising a curable oligomer selected from one or more of aliphatic urethane acrylates, aliphatic urethane methacrylates, polyether urethane acrylates, polyether urethane methacrylates, polyester urethane acrylates and polyester urethane methacrylates.

12. A coating composition according to claim 1 comprising a curable monomer selected from one or more of a hydroxyl-substituted alkyl acrylate or alkyl methacrylate, and isobornyl methacrylate

13. (canceled)

14. A coating composition according to claim 1 comprising the oligomer and a monomer wherein the oligomer is present at a level of 35 to 70% and the monomer is present at a level of 5 to 15%.

15. A coating product comprising as separate compositions, a coating composition according to claim 1 and a non-aqueous composition comprising a curable oligomer and./or monomer and a UV absorber.

16. (canceled)

17. A coating composition according to claim 1 adapted to coat nails.

18. (canceled)

19. A coating composition according to claim 1 wherein the coating composition is a gel coating composition.

20. A cured coating comprising a chromic component comprising a liquid crystal at a level of 30 to 80% by weight of the coating and a continuous polymer phase which is derived from a cured oligomer and/or, a cured monomer, and an initiator, wherein the chromic component is dispersed in the said continuous phase.

21. A cured coating according to claim 20 coated on a nail to provide a chromic layer and a top-coat comprising a cured oligomer and/or monomer and a UV absorber coated on the chromic layer.

22. A method of providing a cured coating which comprises applying a coating composition to a substrate to be coated which coating composition comprises a chromic component comprising a liquid crystal at a level of 30 to 80% by weight of the composition, and a curable oligomer and/or a monomer and an initiator, curing the curable oligomer and/or monomer to form a polymer to provide a continuous phase comprising the polymer and a disperse phase comprising the chromic composition dispersed in the continuous phase.

23. (canceled)

24. A process of providing a colour-change effect on a keratinous substrate comprising applying a chromic product comprising a liquid crystal coating comprising a continuous polymer matrix derived from a curable oligomer and/or a curable monomer to provide a colour-change effect to a keratinous substrate.

Description

EXAMPLES

Example 1

[0073] A composition was prepared by mixing the following components in the amounts (by weight based on the whole composition) specified in the following tables.

TABLE-US-00001 Component Percentage (%) BR-541 (polyether urethane acrylates, supplied 50 by Dymax) Unsealed cholesteric liquid crystal 40 HEMA (hydroxyethyl methacrylate) 5 TPO-L (Ethyl (2,4,6-trimethylbenzoyl) phenyl 5 phosphinate

Example 2

[0074] A composition was prepared by mixing the following components in the amounts (by weight based on the whole composition) specified

TABLE-US-00002 Component Percentage (%) Genomer 4247 (aliphatic urethane 35 methacrylate) Urethane acrylate 03-978 10 1121M (isobornyl methacrylate) 2 TPO-L (Ethyl (2,4,6-trimethylbenzoyl) phenyl 2 phosphinate Unencapsulated cholesteric liquid crystal 50

Example 3

[0075] A UV top coat formulation having the following components was prepared:

TABLE-US-00003 Component Percentage (%) Genomer 4247 (aliphatic urethane 68 methacrylate) Urethane acrylate 03-978 20 1121M (isobornyl methacrylate) 5 TPO-L (Ethyl (2,4,6-trimethylbenzoyl) phenyl 5 phosphinate Avobenzone 2

[0076] The top coat formulation was applied to a nail coated with a gel coating according to the invention as set out in Examples 1 and 2 and provided improved durability, resistance to abrasion and UV protection.

Example 4

[0077] A black base coat was painted onto a nail. A gel composition according to Example 1 was then applied. Upon curing, the gel coating provided attractive colour change effect and a durable finish. This procedure was repeated with a gel composition according to Example 2. An attractive durable finish was obtained.