COMPOSITIONS FOR PRODUCING GLASS COATINGS BY WAY OF INKJET PRINTING TECHNIQUES AND USE THEREOF

Abstract

A coating material for the production of a UV-curing primer coating. The coating material includes at least 60 to 90 wt.-% of at least one monofunctional cycloaliphatic acrylate monomer or at least one monofunctional aryloxy alkyl acrylate monomer, 1 to 10 wt.-% of at least one amino-functional silane, 1 to 10 wt.-% of at least one photoinitiator, and up to 10 wt.-% of at least one of at least one acrylate oligomer and at least one methacrylate oligomer, each based on a total weight of the coating material.

Claims

1-15. (canceled)

16. A coating material for the production of a UV-curing primer coating, the coating material comprising: at least 60 to 90 wt.-% of at least one monofunctional cycloaliphatic acrylate monomer or at least one monofunctional aryloxy alkyl acrylate monomer; 1 to 10 wt.-% of at least one amino-functional silane; 1 to 10 wt.-% of at least one photoinitiator; and up to 10 wt.-% of at least one of at least one acrylate oligomer and at least one methacrylate oligomer, each based on a total weight of the coating material.

17. The coating material as recited in claim 16, further comprising: up to 1 wt.-% of at least one surfactant based on the total weight of the coating material.

18. The coating material as recited in claim 17, wherein the at least one surfactant is a modified poly(organo)siloxane.

19. The coating material as recited in claim 16, wherein the at least one monofunctional cycloaliphatic acrylate monomer is at least one of phenoxyethyl acrylate and trimethylol-propane formal acrylate.

20. The coating material as recited in claim 16, wherein the at least one amino-functional silane is at least one of bis[(3-trimethoxysilyl)propyl]amine and aminopropyltriethoxysilane.

21. The coating material as recited in claim 16, wherein the at least one photoinitiator is a phosphine oxide derivative.

22. The coating material as recited in claim 16, wherein the coating material comprises 0.01 to 10 wt.-% of at least one of the at least one acrylate oligomer and the at least one methacrylate oligomer, each based on the total weight of the coating material.

23. The coating material as recited in claim 16, wherein the at least one acrylate oligomer and the at least one methacrylate oligomer is selected from the group consisting of a polyester acrylate oligomer, a polyester methacrylate oligomer, a polyether acrylate oligomer, a polyether methacrylate oligomer, a urethane acrylate oligomer, a urethane methacrylate oligomer, and mixtures thereof.

24. A coating system for the decoration of a glass surface, the coating system comprising: a primer layer comprising at least one primer coating, the at least one primer coating being produced from the coating material as recited in claim 16; a decorative layer comprising at least one ink coating; and a top coat layer comprising at least one top coat.

25. The coating system as recited in claim 24, wherein the at least one ink coating is produced via at least one UV-curing inkjet ink.

26. The coating system as recited in claim 24, wherein the at least one top coat is produced from a UV-curing clear coat.

27. A method for printing on a glass surface, the method comprising the steps of: (a) applying to the glass surface the at least coating material as recited in claim 16 via an inkjet printing method; (b) pre-gelling of the at least one coating material applied via UV radiation; (c) applying at least one ink via the inkjet printing method to the pre-gelled at least one coating material; (d) pre-gelling of the at least one ink applied via UV radiation; (e) applying at least one clear coat via the inkjet printing method to the pre-gelled at least one ink, to thereby obtain a layer construction; and (f) curing the layer construction via UV radiation.

28. The method as recited in claim 27, further comprising repeating the steps of: (c) applying at least one ink via the inkjet printing method to the pre-gelled at least one coating material; and (d) pre-gelling of the at least one ink applied via UV radiation, as, (c1) applying at least one white ink via the inkjet printing method to the pre-gelled at least one coating material; (d1) pre-gelling of the at least one white ink applied via UV radiation; (c2) applying at least one color ink via the inkjet printing method to the pre-gelled at least one white ink; and (d2) pre-gelling of the at least one color ink applied via UV radiation.

29. A method of using the method as recited in claim 27 to print on at least one of a flat glass and a glass-formed container, the method comprising: providing at least one of the flat glass and the glass-formed container; and printing on at least one of the glass surface and the glass-formed container via the method as recited in claim 27.

30. The method of using as recited in claim 29, wherein the at least one of the flat glass and the glass-formed container includes a drinking glass, a beverage bottle, and a glass packaging for food.

Description

EXAMPLE

Example 1

[0037] Composition of the primer coating material

TABLE-US-00001 Quantity Constituent [% by weight] Phenoxyethyl acrylate 83.5 Urethane methacrylate oligomer 5.0 Bis[(3-trimethoxysilyl)propyl]amine 5.0 Silicone polyether acrylate 0.5 Bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide 3.0 2,4,6-trimethylbenzoyl-diphenylphosphine oxide 3.0

Printing Method:

[0038] A commercially available inkjet printing plant for rotationally symmetric bodies with a print head type Konica Minolta KM1024 was used for printing. Printing was executed on commercially available drinking glasses. In a first step, the glass surfaces were pre-treated by flame-pyrolytic surface silicating. Afterwards the primer coating material according to example 1 was imprinted with a resolution of 360360 dpi with a printing speed of 20 m/min. Then a pinning of the imprinted coatings by an LED spot with a power of 2 W at a wavelength of 395 nm was effected. On the pre-gelled primer coating, a commercially available white UV-curing inkjet ink was imprinted with a resolution of 360360 dpi and a printing speed of 20 m/min. Then a pinning of the imprinted coating was effected by an LED spot with a power of 2 W at a wavelength of 395 nm. Commercially available UV-curing inkjet colour inks were printed on the pre-gelled white ink coating with a resolution of 360360 dpi and a printing speed of 20 m/min. Then a pinning of the imprinted coating by an LED spot with a power of 2 W at a wavelength of 395 nm was effected. A commercially available UV-curing clear coat that is suitable for inkjet printers was printed on the pre-gelled colour ink coatings with a resolution of 360360 dpi and a printing speed of 20 m/min. Then all imprinted and pre-gelled coatings were cured by radiation by means of a medium-pressure mercury lamp with a power of 270 W/cm.

Determination of Scratch Resistance:

[0039] A weight-loaded scratch stylus (model Erichsen 435S) was placed with its tip on the coating to be tested and was then, vertically upright, pulled over the surface to be tested. Then it was visually assessed whether the tested coating had a scratching track. The maximum mass of weight with which the scratch stylus can be loaded without the coating being damaged during the test is a measure of the scratch resistance of the coating. A result of more than 5 newtons or more without damage on the coating is considered as being a good scratch resistance.

Determination of Adhesion (Cross-Cut Test):

[0040] For a cross-cut, six parallel cuts are applied to the coating of the test specimens with a cutter knife. The cuts in the coating are so deep that they reach the substrate surface without damaging it. Then further six parallel cuts are applied which are perpendicular to the first ones and form an even square or lattice. The grid spacing is 1 mm. A clear or crepe tape strip with an adhesive force of 8 to 10 N/25 mm is sticked onto the resulting square. It is removed at an angle of 60% in a time of 0.5 to 1 s. Then the grid or coating is assessed visually. The grid cut characteristic value Gt 0 corresponds to a very good adhesive strength, and the characteristic value Gt 5 corresponds to a very poor adhesive strength.

Determination of Adhesion (Tape Test)

[0041] On the coated specimen, an adhesive tape strip (type Tesa-Film 57370-00002) is fixed on the coating to be tested using light pressure and avoiding inclusions of air. After having waited for 10 seconds, the adhesive tape strip is removed in an angle of 60 and visually assessed. The result is considered to be good if no residues can be seen on the adhesive tape strip.

Determination of Water Resistance:

[0042] The specimen is completely immersed into water for 3 days at a temperature of 23 C. Then the specimen is removed from water and without reconditioning its adhesion (cross-cut test and tape test) and scratch resistance are checked. Water resistance is considered to be good, if the three tests after immersion of the specimens into water do not provide worse results than prior to the immersion into water.

Determination of the Specimens with Regard to the Question Whether they are Dishwasher Proof:

[0043] The specimen is washed in a commercially available industrial dishwasher with a commercially available industrial dishwashing liquid for 10 minutes at a temperature of 60 to 75 C. Afterwards, the coating surface is visually assessed, with the surface being particularly evaluated with respect to changes in surface and colour. After a 10-minute reconditioning at 23 and at 50% relative humidity of air the cross-cut test and tape test are executed. Then the quantity of wash cycles without worsening of the test results is determined.

[0044] The test results are summarized in the following table.

[0045] Table: Summary of Results

TABLE-US-00002 Result Result Result after after directly immersion 1000 after into wash Test curing water cycles Scratch resistance >5N >5N >5N Cross-cut test GT 0 GT 0 GT 0 Tape test no residue no residue no residue Visual assessment Reference no change no change

[0046] All specimens show a good adhesion of the coating to the substrate as well as a high scratch resistance, which do not worsen either after cleaning processes. The influence of water, chemicals and temperature as it occurs with usual cleaning methods do not reveal any recognizable effect on the glass coating.