METHOD FOR OBTAINING A METALLIZED SURFACE HAVING A DESIGN

Abstract

The invention relates to a new method for metallizing a surface, in particular of a solid packaging, allowing said surface to be entirely or locally personalized by modifying the reflective properties of the deposited metal layer. The invention also relates to the metallized surface obtained in said manner.

Claims

1. A method for metallizing a surface comprising successively applying (i) a basecoat, (ii) a metal layer, and then (iii) a topcoat to protect the metal layer, wherein the surface state of the basecoat is modified before applying the metal layer by transfer or printing of a printing composition comprising inorganic and/or organic fillers and a binder, the amount and the particle size of inorganic and/or organic fillers in the printing composition are selected to create upon transfer a heterogeneous surface alternating binder and filler so as to modify the reflective properties of the surface after metallization.

2. (canceled)

3. (canceled)

4. (canceled)

5. The method of 1, wherein the inorganic fillers are selected from particles of silica, quartz, mica, kaolin, and mixtures thereof.

6. The method of claim 1, wherein the organic fillers are selected from particles of polymers PMMA, PS, derivatives of polyamides, polyimides, polyolefins, polurethanes, polyesters and mixtures thereof.

7. The method of 1, wherein the fillers have a particle size ranging from 1 to 50 m.

8. The method of claim 1, wherein the binder comprises a mixture of polymers selected from epoxy resins, polyols, acrylate oligomers, acrylic or vinyl thermoplastic resins and mixtures thereof.

9. The method of claim 1, wherein the printing composition comprises from 5 to 18% by mass of inorganic fillers.

10. The method of claim 1, wherein the printing composition is cured by treatment with UV radiation.

11. The method of claim 1, wherein the printing composition is deposited by transfer on the basecoat.

12. The method of claim 11, wherein the transfer is done by screen printing.

13. (canceled)

14. The method of claim 1, wherein the printing composition on the basecoat has a thickness of 5 to 40 m.

Description

DESCRIPTION OF THE FIGURES

[0067] FIG. 1 shows a metallized surface according to the state of the art with the surface to be metallized (1), the basecoat (2), the metal layer (3) and the topcoat (4).

[0068] FIG. 2 shows the surface metallized with the method described in the state of the art when a conventional printing layer without fillers (5) is applied to the basecoat (2) to create a relief without modification of the surface state. The metal layer (3) follows this relief without modification of its reflective properties.

[0069] FIG. 3 shows a surface metallized with the method of the invention when fillers (6) are deposited on the surface of the basecoat with an ink containing the fillers according to the invention. The surface thus created comprises an alternation of unmodified areas (5) and areas whose surface state is modified by the presence of fillers (6), each having different reflective properties. This heterogeneity of reflectivity is found on the surface of the metal layer 3, depending on whether it is deposited on the untreated surface (3a) or on the fillers (3b).

EXAMPLES

Example 1: Ink Formulation

[0070]

TABLE-US-00001 Components Weight % PETIA 38.48 CERAFLOUR 913 12.28 EBC 8465 16.37 IRGACURE 184 4.87 HDDA 27.02 FOAMEX 810 0.49 RAD 2100 0.49 Total 100 PETIA: Pentaerythritol triacrylate, acrylate monomer, which constitutes the binder of the formulated UV ink, manufactured by ALLNEX CERAFLOUR 913: Micronized polypropylene wax, for creating the desired surface state, manufactured by BYK EBC 8465: UV-curable aliphatic urethane triacrylate, acrylate oligomer which constitutes the binder of the formulated UV ink, manufactured by ALLNEX IRGACURE 184: Photoinitiator used to initiate radical polymerization of the acrylate reactive species present in the ink, manufactured by BASF. HDDA: HEXANEDIOL DIACRYLATE, difunctional acrylate monomer used for the formulation of UV-cured components in particular, manufactured by ALLNEX. FOAMEX 810: Defoamer used in the manufacture of inks, manufactured by EVONIK RAD 2100: UV-curable additive, for its flow and wetting properties, manufactured by EVONIK.

Example 2: Preparation of a Metallized Mascara Tube

[0071] 1. An adhesion primer for polyolefins is sprayed onto a blow-moulded plastic (PP) part. Rapid drying at room temperature allows the residual solvents in the primer to evaporate. [0072] 2. The basecoat described above is then sprayed on. The residual solvents present on the part are evaporated by exposure to hot air (hot air tunnel or IR lamps). The basecoat is then exposed to UV radiation which will polymerize the different reactive species present in the formulation. [0073] 3. The ink described in example 1 is then deposited by screen printing, according to a design predefined during the manufacture of the silk screen. Silk screen characteristics: 140-30. This is then exposed to UV radiation to cause it to polymerize. [0074] 4. A thin layer of aluminium is then deposited by evaporation in a vacuum chamber. This metal layer conforms to the surface state of the ink, giving it a unique structure and visual properties. [0075] 5. The topcoat described above is then sprayed on. As with the basecoat, the residual solvents are evaporated, and polymerization takes place under UV radiation.

REFERENCES

[0076] WO 2008/035186 [0077] US 2005/219626 [0078] WO 2013/087058