Production process of color filter for liquid crystal display device and ink

• US 5,922,401 A
• Filed: 06/25/1997
• Issued: 07/13/1999
• Est. Priority Date: 06/13/1997
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kashiwazaki, Akio, Nakazawa, Koichiro, Shirota, Katsuhiro, Hirose, Masashi, Shiba, Shoji
• Primary Examiner(s): DUDASH, DIANA L
• Application Number:
  US08/882,073
• Time in Patent Office: 748 Days
• Field of Search: 427/164, 427/163.1, 427/261, 427/265, 427/269, 427/511, 427/493, 427/165, 427/514, 427/379, 427/162, 427/407.2, 348/835, 313/479, 359/584, 359/588, 359/722, 359/885, 349/106, 349/108
• US Class Current: 427/164
• CPC Class Codes: B41J 2/01 Ink jet
• CPC Class Codes: C09D 11/30 Inkjet printing inks
• CPC Class Codes: C09K 2323/035 Ester polymer, e.g. polycarbonate, polyacrylate or polyester
• CPC Class Codes: G02B 5/201 in the form of arrays

Abstract

Disclosed herein is a process for producing a color filter for liquid crystal display device by applying inks to a base by an ink-jet printing system to arrange colorants on the base, which comprises the steps of applying inks, which each comprise a homopolymer of a monomer represented by the formula (I) ##STR1## or of the formula (II) ##STR2## wherein R₁ is H or CH₃, and R₂ and R₃ are independently H or an alkyl group having 1 to 5 carbon atoms, and/or a copolymer of the monomer with another vinyl monomer and can be cured by light or heat, directly onto the base or onto a resin layer provided on the base by the ink-jet printing system, thereby arranging colorants contained in the inks; and then curing the thus-applied inks by light exposure or heating.

Claims

1. A process for producing a color filter by applying inks to a base by an ink-jet printing system to arrange colorants on the base, which comprises the steps of:

applying inks, which each comprise a colorant, a water-containing liquid medium and a homopolymer of a monomer represented by the formula (I) ##STR13## or of the formula (II) ##STR14## wherein R₁ is H or CH₃, and R₂ and R₃ are independently H or an alkyl group having 1 to 5 carbon atoms, and/or a copolymer of the monomer with another vinyl monomer and can be cured by light or heat, directly between black matrices on the base or a resin layer provided on the base by the ink-jet printing system, thereby arranging the colorants contained in the inks; and

then

curing the thus-applied inks by light exposure or heating.

3. The process according to claim 1, wherein the inks further comprise a cationic compound.

4. The process according to claim 1 or 2, wherein the resin layer has a thickness of from 0.1 to 10 μ

m.

5. The process according to claim 4, wherein the resin layer has a thickness of from 0.3 to 5 μ

m.

6. The process according to claim 1, wherein the homopolymer or copolymer containing the monomer of the formula (I) is contained in a proportion of from 0.05 to 30% by weight in each of the inks.

7. The process according to claim 1, wherein the homopolymer or copolymer containing the monomer of the formula (I) is contained in a proportion of from 0.1 to 10% by weight in each of the inks.

8. The process according to claim 1, wherein the homopolymer or copolymer containing the monomer of the formula (II) is contained in a proportion of from 0.01 to 30% by weight in each of the inks.

9. The process according to claim 1, wherein the homopolymer or copolymer containing the monomer of the formula (II) is contained in a proportion of from 0.1 to 10% by weight in each of the inks.

10. The process according to claim 1 or 2, wherein the monomer of the formula (I) is a monomer selected from the group consisting of N-methylol-acrylamide, N-methoxy-methylacrylamide, N-ethoxymethyl-acrylamide, N-isopropoxy-methylacrylamide, N-methylol-methacrylamide, N-methoxy-methylmethacrylamide and N-ethoxymethylmethacrylamide.

11. The process according to claim 1 or 2, wherein the monomer of the formula (II) is a monomer selected from the group consisting of N,N-dimethylol-acrylamide, N,N-dimethoxymethylacrylamide, N,N-diethoxy-methylacrylamide, N,N-dimethylolmethacrylamide, N,N-dimethoxymethylmethacrylamide and N,N-diethoxymethyl-methacrylamide.

12. The process according to claim 1, wherein said another vinyl monomer is a monomer selected from the group consisting of acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, hydroxymethyl methacrylate, hydroxyethyl methacrylate, hydroxymethyl acrylate, hydroxyethyl acrylate, styrene, α

-methylstyrene, vinyl acetate and vinyl propionate.

15. The process according to claim 1, wherein the monomer of the formula (I) is contained in a proportion of from 5 to 95% by weight in the copolymer.

16. The process according to claim 1, wherein the monomer of the formula (I) is contained in a proportion of from 7 to 90% by weight in the copolymer.

17. The process according to claim 1, wherein the monomer of the formula (I) is contained in a proportion of from 10 to 85% by weight in the copolymer.

18. The process according to claim 1, wherein the monomer of the formula (II) is contained in a proportion of from 5 to 100% by weight in the copolymer.

19. The process according to claim 1, wherein the monomer of the formula (II) is contained in a proportion of from 10 to 90% by weight in the copolymer.

21. The process according to claim 1 or 2, further forming a resin layer containing a resin composition curable by light or heat on the cured inks.

22. The process according to claim 1 or 2, wherein three inks of red, green and blue colors are used.

23. The process according to claim 1 or 2, wherein the black matrices are formed of a black pigment-containing resist.

24. A method of producing a liquid crystal display device comprising a pair of substrates each having an electrode, a liquid crystal compound held between the pair of substrates and a color filter provided on any one of the pair of substrates, wherein the color filter is produced by the production process according to claim 1 or 2.

25. A method of producing a liquid crystal display device comprising a thin film transistor substrate having a color filter, another substrate having a counter electrode and a liquid crystal compound held between the substrates, wherein recessed pixel parts are made on the substrate in which a thin film transistor array has been formulated, and the color filter is produced in the recessed pixel parts by the production process according to claim 1 or 2.

2. A process for producing a color filter by applying inks to a base by a ink-jet printing system to arrange colorants on the base, which comprises the steps of:

applying inks, which each comprise a colorant, a water-containing liquid medium and an acrylic copolymer comprised of a monomer represented by the formula (I) ##STR15## or of the formula (II) ##STR16## wherein R₁ is H or CH₃, and R₂ and R₃ are independently H or an alkyl group having 1 to 5 carbon atoms, and an acrylic monomer containing a cationic structural unit and can be cured by heat, directly between black matrices on the base or a resin layer provided on the base by the ink-jet printing system, thereby arranging the colorants contained in the inks; and

then

curing the thus-applied inks by heating.

13. The process according to claim 2, wherein the acrylic monomer containing a cationic structural unit is a monomer selected from the group consisting of acrylamide, methacrylamide, acrylonitrile, allylamine, vinylamine, vinylpyrrolidone type monomers, vinyloxazolidone type monomers, vinylimidazole type monomers and monomers having a quaternary ammonium salt group on their side chains.

14. The process according to claim 2, wherein the acrylic monomer containing a cationic structural unit is an acrylic monomer having a tertiary amino group.

20. The process according to claim 2, wherein the acrylic monomer containing a cationic structural unit is contained in a proportion of from 1 to 50% by weight in the copolymer.