US 2023/0407119 A1Published application

Reactive sol-gel ink for digital printing

AssigneeHelios Tovarna Barv, Lakovin Umetnih Smol Kolicevo D.O.O.

InventorsStefano GAZZOLA, Stefano COSTACURTA, Luca BELLOTTO, Karl RAMETSTEINER, Christian BREITWIESER

Life of this patent

Estimating the term…

Loading patent…

Abstract

The present invention relates to a reactive sol-gel ink for printing a metallic substrate, preferably for a coil coating process, comprising 10 to 30 wt % of a sol-gel resin composition and at least one pigment, preferably at least one yellow pigment, at least one purple pigment, at least one cyan pigment or at least one black pigment. The sol-gel ink of the present invention can be used in a digital print process, preferably using ink jet means, as a mediator of covalent bonds between a print layer formed by the sol-gel ink and metal oxides and/or metal hydroxides on the metallic substrate and/or hydroxyl groups comprised in a base coat layer covering at least partially the metallic substrate and/or hydroxyl groups comprised in a top coat composition covering at least partially the sol-gel ink.

Claims17

Dependent claims

A reactive sol-gel ink for printing a metallic substrate, preferably for a coil coating process, comprising 10 to 30 wt % of a sol-gel resin composition and at least one pigment, preferably at least one yellow pigment, at least one purple pigment, at least one cyan pigment or at least one black pigment, wherein the sol-gel resin composition comprises

a) 35 to 65 wt % of a hydrolysate obtainable by reacting a mixture comprising at least one epoxy functionalized alkoxy-silane, at least one further trialkoxysilane and at least one aluminum alkoxide with water comprising at least one acidic catalyst, wherein water is added to said mixture in a molar ratio to each hydrolysable group of the at least one epoxy functionalized alkoxy-silane, the at least one further trialkoxysilane and the at least one aluminum alkoxide ranging from 0.95:1 to 1:0.95,
b) 30 to 60 wt % of at least one alcohol, and
c) 0.1 to 10 wt % water.

Dependencies are inferred from the claim text.