Ink composition for steel material, having excellent adhesion, method for manufacturing printed steel sheet by using same, and printed steel sheet manufactured thereby

Patent metadata

Field	Value
Publication number	US-10696858-B2
Application number	US-201616064167-A
Country	US
Kind code	B2
Filing date	Dec 21, 2016
Priority date	Dec 23, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

An ink composition for a printed steel sheet, having excellent adhesion to a steel sheet, processability, solvent resistance, and the like, a method for manufacturing a printed steel sheet using the same, and a printed steel sheet manufactured thereby, are provided. The ink composition for a steel material includes 10 to 30 parts by weight of a mixture of a urethane acrylate oligomer and another type of acrylate oligomer different from the urethane acrylate oligomer, 65 to 80 parts by weight of a radiation curable monomer which is a mixture of a monofunctional radiation curable monomer and a di- or more functional radiation curable monomer, 1 to 10 parts by weight of a photoinitiator, and 0.01 to 10 parts by weight of an adhesion promoter.

First claim

The invention claimed is:

1. An ink composition for a steel material, comprising:
10 parts by weight to 30 parts by weight of a mixture of a urethane acrylate oligomer and a polyester acrylate oligomer, wherein the urethane acrylate oligomer and the polyester acrylate oligomer are mixed in a weight ratio of 2:1 to 10:1;
65 parts by weight to 80 parts by weight of a radiation curable monomer that is a mixture of a monofunctional radiation curable monomer and a di- or more functional radiation curable monomer, wherein the monofunctional radiation curable monomer and the di- or more functional radiation curable monomer are mixed in a weight ratio of 6:1 to 50:1;
1 part by weight to 10 parts by weight of a photoinitiator; and
0.01 part by weight to 10 parts by weight of an adhesion promoter.

2. The ink composition of claim 1 , wherein the urethane acrylate oligomer has a weight-average molecular weight of 500 to 12,000.

3. The ink composition of claim 1 , wherein the urethane acrylate oligomer is aliphatic urethane acrylate.

4. The ink composition of claim 1 , wherein a number of functional groups in the urethane acrylate oligomer is less than or equal to 3.

5. The ink composition of claim 1 , wherein a number of functional groups in the polyester acrylate oligomer is less than or equal to 4.

6. The ink composition of claim 1 , wherein the polyester acrylate oligomer has a weight-average molecular weight of 500 to 3,000.

7. The ink composition of claim 1 , wherein the monofunctional radiation curable monomer is selected from the group consisting of isooctyl acrylate, cyclic trimethylolpropane formal acrylate, phenoxybenzyl acrylate, trimethylcyclohexyl acrylate, isobornyl acrylate, benzyl acrylate, lauryl acrylate, isodecyl acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, ethoxy ethoxyethyl acrylate, stearyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, acrylic morpholine, vinyl ether, vinyl ester, N-vinyl-2-pyrrolidone, and N-vinylcaprolactam.

8. The ink composition of claim 1 , wherein the di- or more functional radiation curable monomer is selected from the group consisting of ethylene glycol diacrylate, hexanediol diacrylate, triethylene glycol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, tetraethylene glycol diacrylate, neopentyl glycol diacrylate, tricyclodecane dimethanol diacrylate, polyethylene glycol 400 diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, glycerol triacrylate, and pentaerythritol triacrylate.

9. The ink composition of claim 1 , wherein the ink composition has viscosity of 40 cps or less at room temperature.

10. The ink composition of claim 1 , wherein the ink composition has a surface tension of 20 to 50 dyne/cm.

11. A method for manufacturing a printed steel sheet, the method comprising:
jetting the ink composition of claim 1 onto a steel sheet; and
forming a coating film by curing the jetted ink composition.

12. A printed steel sheet comprising:
a steel sheet; and
a coating film formed on the steel sheet from the ink composition of claim 1 .

13. An ink composition for a steel material, comprising:
10 parts by weight to 30 parts by weight of a mixture of a urethane acrylate oligomer and an epoxy acrylate oligomer, wherein the urethane acrylate oligomer and the epoxy acrylate oligomer are mixed in a weight ratio of 2:1 to 10:1, and the epoxy acrylate oligomer has a weight-average molecular weight of 500 to 2,000;
65 parts by weight to 80 parts by weight of a radiation curable monomer that is a mixture of a monofunctional radiation curable monomer and a di- or more functional radiation curable monomer, wherein the monofunctional radiation curable monomer and the di- or more functional radiation curable monomer are mixed in a weight ratio of 6:1 to 50:1;
1 part by weight to 10 parts by weight of a photoinitiator; and
0.01 part by weight to 10 parts by weight of an adhesion promoter.

14. The ink composition of claim 13 , wherein the urethane acrylate oligomer has a weight-average molecular weight of 500 to 12,000.

15. The ink composition of claim 13 , wherein the urethane acrylate oligomer is aliphatic urethane acrylate.

16. The ink composition of claim 13 , wherein a number of functional groups in the urethane acrylate oligomer is less than or equal to 3.

17. The ink composition of claim 13 , wherein the monofunctional radiation curable monomer is selected from the group consisting of isooctyl acrylate, cyclic trimethylolpropane formal acrylate, phenoxybenzyl acrylate, trimethylcyclohexyl acrylate, isobornyl acrylate, benzyl acrylate, lauryl acrylate, isodecyl acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, ethoxy ethoxyethyl acrylate, stearyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, acrylic morpholine, vinyl ether, vinyl ester, N-vinyl-2-pyrrolidone, and N-vinylcaprolactam.

18. The ink composition of claim 13 , wherein the di- or more functional radiation curable monomer is selected from the group consisting of ethylene glycol diacrylate, hexanediol diacrylate, triethylene glycol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, tetraethylene glycol diacrylate, neopentyl glycol diacrylate, tricyclodecane dimethanol diacrylate, polyethylene glycol 400 diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, glycerol triacrylate, and pentaerythritol triacrylate.

19. The ink composition of claim 13 , wherein the ink composition has viscosity of 40 cps or less at room temperature.

20. The ink composition of claim 13 , wherein the ink composition has a surface tension of 20 to 50 dyne/cm.

Assignees

• Posco
• Inktec Co Ltd

Inventors

• Choi Ha-Na
• Yu Kyung-Pyo
• Kim Jin-Tae
• Park Chan-Hee
• Lee Jung-Hwan
• Song Yon-Kyun

Classifications

• C08F220/301

  and one oxygen in the alcohol moiety · CPC title

• C09D7/63

  organic · CPC title

• C08F220/20

  of polyhydric alcohols or phenols {, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate} · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• C09D7/40

  Additives · CPC title