# US 2020/0399486 A1 · Single pass printing of white on corrugated board

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- Number: US 2020/0399486 A1
- Document ID: US20200399486A1
- Status: Published application
- Kind: A1
- Application number: 17/011,821
- Filed: 2020-09-03
- Published: 2020-12-24
- Earliest claimed: 2016-05-25
- Assignees: Electronics for Imaging, Inc.
- Applicants: Electronics for Imaging, Inc.
- Inventors: Joshua Samuel; Steven A. Billow; Frank J. Bruck, III; Huilei Zhang
- Web page: https://patentgrep.com/patent/US20200399486A1

## CPC

- B41M 5/0011: {Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating (after-treatment of prints B41M7/00; printers for treating or overcoating copy materials before, during or after printing B41J11/0015)}
- C09D 11/101: Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
- C09D 11/107: from unsaturated acids or derivatives thereof
- C09D 11/12: based on waxes or bitumen
- C09D 11/322: Pigment inks
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- C09D 11/40: Ink-sets specially adapted for multi-colour inkjet printing
- B41M 5/0047: {by ink-jet printing}
- B41M 7/0081: {using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams}
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

The present invention is directed to a method for single pass printing on an absorbent non-white substrate. The method comprises: (a) applying a primer composition to one or more selected surfaces of an absorbent non-white substrate to form a primer layer to seal the selected surfaces of the substrate, (b) drying the primer layer, (c) printing a white ink on the primer layer, and (d) drying or curing the white ink. The present invention also relates to low odor radiation curable white ink compositions. The white ink composition comprises 10-40% w/w of 4-hydroxybutylacrylate, 0.5-10% of a urethane (meth)acrylate oligomer, 10-55% of diacrylates, one or more photoinitiators, one or more additives, and one or more white pigments. The composition excludes many monofunctional monomers that have distinct odor and are commonly used in an ink jet composition.

## Claims

### Claim 1

A method for single pass printing a white ink on an absorbent non-white paper substrate, comprising:
applying a water-based primer composition to one or more selected surfaces of an absorbent non-white paper substrate to form a primer layer to seal the selected surfaces of the paper substrate against absorption before printing with a white ink,
drying the primer layer,
single pass printing the white ink on the primer layer only so that the white ink is only on the sealed surface of the substrate and remains white, and
drying or curing the white ink;
wherein said white ink is a low odor radiation curable composition comprising: 10-40% w/w of 4-hydroxybutyl acrylate, 0.5-10% of a urethane (meth)acrylate oligomer, 10-55% of diacrylates, one or more photoinitiators, one or more additives, and a white pigment; and the white composition contains less than 1% of a monofunctional momoner that has an undesired odor selected from the group consisting of: vinyl caprolactam, 2-phenoxyethyl acrylate, isodecyl acrylate, 3,3,5-trimethylcyclohexyl acrylate, isooctyl acrylate, octyldecyl acrylate, isobornyl acrylate, cycloaliphatic acrylate monomer, benzyl acrylate, di(ethylene glycol) 2-ethylhexyl acrylate, tridecyl acrylate, 2(2-ethoxyethoxy) ethyl acrylate, lauryl acrylate, and tetrahydrofurfuryl acrylate.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the white ink is cured with actinic radiation.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the primer composition comprises an acrylic polymer emulsion, a deformer, a surfactant or a wetting agent, wax, and water.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the acrylic polymer emulsion comprises a copolymer of styrene and acrylic acid ester.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the primer composition comprises 38-44% w/w styrene-acrylic acid ester copolymer, 0.05-0.5% w/w defoamer, 0.2-1% surfactant, 2.0-6.0% w/w wax, and water.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the white ink composition comprises:
30-55% w/w of diacrylate selected from the group consisting of: dipropylene glycol diacrylate, dipropylene glycol diacrylate, propoxylated neopentyl glycol diacrylate, aliphatic urethane diacrylate, and a combination thereof.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the white ink comprises 10-35% by weight of the white pigment.

### Claim 8 (depends on 6)

The ink composition of claim 6, wherein the white ink viscosity is 5-14 cP at 45° C., or less than 30 cp at 25° C.

### Claim 9 (depends on 1)

The method according to claim 1, after drying or curing the white ink, further comprises the steps of depositing a color ink on top of the white ink, and drying or curing the color ink with actinic radiation.