JPH0463878A - Water-based ink - Google Patents

Abstract

PURPOSE:To obtain water-based ink which hardly gets dry at the point of a pen but quickly gets dry in a print by incorporating a coloring agent, water, and a sorbitan fatty acid ester. CONSTITUTION:2-20wt.% coloring agent comprising a water-soluble dye and a pigment (e.g. C.I. Acid Black); 30-80wt.% water; 0.1-10wt.% sorbitan fatty acid ester (e.g. sorbitan monolaurate); and, optionally 0.01-5.0wt.% surfactant, 1-50wt.% water-soluble organic solvent (e.g. ethylene glycol), a preservative, a milderproofing agent, a humectant aid, a rust preventive, an antifoamer, and other additives are compounded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a water-based ink, and more particularly to a water-based ink that is used in writing instruments and has excellent drying resistance of the pen tip.

[Conventional technology and its challenges] Conventionally, in order to improve the drying resistance of water-based ink pen nibs,
It has been proposed to use hygroscopic water-soluble organic solvents such as glycol solvents, glycol ether solvents, glycol ether ester solvents, and amine solvents.

However, when the above-mentioned hygroscopic water-soluble organic solvent is added to improve the drying resistance of the pen tip of water-based ink, a problem arises in that the drying property of the handwriting deteriorates. No additives are known that improve both properties.

[Means for Solving the Problems] The gist of the present invention is a water-based ink comprising at least a colorant, water, and sorbitan fatty acid ester.

The present invention will be explained in detail below.

As the coloring material, water-soluble dyes and pigments can be used.

Any of acid dyes, direct dyes, food dyes, and basic dyes can be used as the water-soluble dye. In particular, acid dyes,
Direct dyes and food dyes are preferable because they have superior dissolution stability and less toxicity than basic dyes.

An example of a direct dye is described below. Japanol Fast Black D Conch (C, 1, Direct Black 17
), Water Black 100L (19), Water Black L-200 (19), Direct Fast Black B (22), Direct Fast Black A
B (32), Direct Deep Black EX (38), Direct Fast Black Conch (51)
, Kayaras Spragley VGN (71), Kayaras Direct Brilliant Niro 10 (C, 1, Direct Yellow 4), Direct Fast Yellow 5GL (26
), Eisen Primula Yellow GCLH (44), Direct Fast Yellow R (50), Eisen Direct Fast Red FH (c, r, Direct Red 1)
), Nippon Fast Scarlet GSX (same 4),
Direct Fast Erolette 4BS (23),
Eisen Direct Rodulin BH (31), Dire Left Scarlet B (37), Kayaku Direct Scarlet 3B (39), Eisen Primula Pink 2
BLH (75), Sumilight Red F3B (80)
), Eisen Primula Red 4BH (81), Kayaras Sprulbin BL (83), Kayaras Light Red F5G (225), Kayaras Light Red F5B
(226), Kayaras Light Rose FR (227)
, Direct Sky Blue 6B (C, 1, Direct Blue 1), Direct Sky Blue 5B (C, 1, Direct Blue 1),
Sumilight Splat Blue BRR Conch (71), Daibogen Turquoise Blue S (86), Water Blue #3 (86), Kayara Turquoise Blue GL (
86), Kayarasu Splat Blue FF2GL (10
6), Kayarasu Supra Turquoise Blue FBL (same 1
99) etc.

An example of an acidic dye is described below. Acid Blue Black IOB (C, 1, Acid Black 1), Nigrosine (C, 2), Suminol Milling Black 8BX (
24), Kayanor Milling Black VLG (24)
6), Suminol Fast Black BR Conch (same 31
), Mitsui Nylon Black GL (52), Eisen Opal Black WH Extra Conch (52), Sumiran Black WA (52), Ranil Black BG
Extra Conch (107), Kayanor Milling Black TLB C 109), Suminol Milling Black B (109), Kayanor Milling Black TL
R (110), Eisen Opal Black New Conch (119), Water Black 187-L (119)
54), Kayaku Acid Brilliant Flavin FF (
C, 1, Acid Yellow 7:1), Kayashiru Yellow G
(Same 17), Xylene Light Niro 2G 140% (Same 1
7), Suminol Leveling Yellow NR (19), Daiwa Tadrazine (23), Kayaftatrazine (23), Suminol Fast Yellow R (25), Diazid Light Yellow 20P (29), Suminol Knoll Milling Yellow ○ (38), Suminol Milling Yellow MR (42), Water Niro #6 (42),
Kayanor Yellow NFG (49), Suminol Milling Yellow 3G (72), Suminol Fast Yellow G (61), Suminol Milling Yellow G (78)
, Kayanor Yellow N5G (110), Suminol Milling Yellow 4G 200% (141), Kayanor Yellow NG (135), Kayanor Milling Pin 5
GW (127), Kayanor Milling Niro 6GW (
142), Sumitomo Fast Scarlet A (C, 1
, Acid Red 8), Kayak Silk Scarlet (9), Solar Lupine Extra (14), Daiwa 221 Kokushin (18), Eisenbonso RH (2)
6), Daiwa Red No. 2 (27), Suminol Leveling Brilliant Red 33B (35), Kayacyl Rubinol 3GS (37), Eisenerythrosine (51), Kayaku Acid Rhodamine FB (52),
Suminol Leveling Rubinol 30P (same 57),
Diazid Alizarin Rubinol F3G 200% (82), Eisen Eosin GH (87), Water Pink #2 (92), Eisen Acid Phloxin P
B (92), Rose Bengal (94), Kayanor Millinges Scarlet FGW (111), Kayanor Milling Lupin 3BW (129), Sumifol Milling Brilliant Red 3BN Conch (131), Suminol Milling Brilliant Red BS (138)
, Eisen Opal Pink BH (186), Suminol Milling Brilliant Red B Conch (249)
, Kayaku Acid Brilliant Red 3BL (Same 25
4) Kayaku Acid Prilido Brilliant Red BL
(265), Kayanor Milling Red GW (27)
6), Mitsuiad Violet 6BN (C, 1,
Acid Violet 15), Mitsu Acid Violet BN (17), Sumitomo Patent Pure Blue V
X (C, 1, Acid Blue 1), Water Blue #106 (Same 1), Patent Blue AF (Same 7), Water Blue #9 (Same 9), Daiwa Blue No. 1 (Same 9)
, Supranor Blue B (15), Orient Solble Blue BC (22), Suminol Leveling Blue 4GL (23), Mitsui Nylon Fast Blue (25), Kayasil Blue AGG (40), Kayasil Blue BR (41), Mitsui Alizarin Saphyrol SE (43), Suminol Leveling Sky Blue R Extra Conc (62), Mitsui Nylon Fast Sky Blue B (78), Sumitomo Brilliant Indocyanine 6Bh/Q (83) , Sandlancyanin N-6B 350% (90), Water Blue #115 (90), Orient Soluble Blue B
B (93), Sumitomo Brilliant Glue 5G (103), Kayanor Milling Ultra Sky SE (112), Kayanor Milling Cyanine 5R (113)
), Eisen Opal Blue 20LH (158), Daiwa Guinea Green B (C, 1, Acid Green 3
), Acid Brilliant Milling Green B (same 9)
, Daiwa Green #70 (16), Kayanol Cyanine Green G (25), and Suminol Milling Green G (27).

Most food dyes are included in direct dyes or acid dyes, but an example of food dyes that are not included is Water Niro #4 (C, I, Food Yellow 3). These can be used alone or in combination. The amount used is preferably 2 to 20% by weight based on the total amount of the water-based ink.

Pigments include inorganic pigments such as ocher, barium yellow, navy blue, cadmium red, titanium oxide, red iron black, carbon black, azo pigments, phthalocyanine pigments,
Conventionally known pigments include organic pigments such as nitroso pigments, nitro pigments, basic dye pigments, acid dye pigments, vat dye pigments, mordant dye pigments, and natural dye pigments. These can be used alone or in combination. The amount used is 2 to 20% of the total amount of water-based ink.
It is preferable to add % by weight. When using a pigment as a coloring material, it is necessary to use a dispersant from the viewpoints of dispersibility, stability over time, and workability; an example of this is glycerin fatty acid ester.

Polyglycerin fatty acid ester, propylene glycol fatty acid ester, pentaerythritol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyethylene glycol fatty acid ester, polyoxyethylene alkyl ether.

Polyoxyethylene phytosterol, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene lanolin, polyoxyethylene lanolin alcohol, polyoxyethylene alkyl amine , polyoxyethylene fatty acid amide, nonionic surfactants such as polyoxyethylene alkylphenyl formaldehyde condensates, alkyl sulfates, polyoxyethylene alkyl ether sulfates, N-acylamino acid salts, N-acylmethyl taurine salts, polyoxy Examples include anionic surfactants such as ethylene alkyl ether acetate, alkyl phosphate, and polyoxyethylene alkyl ether phosphate.

Surfactants can be used alone or in combination.

The amount used is 0.01 to 5% based on the total amount of the water-based ink composition.
．． 0% by weight is preferred.

Water is used as the main solvent, and the amount used is preferably 30 to 80% by weight based on the total amount of the ink.

Sorbitan fatty acid ester is used to improve the drying resistance of water-based ink. Specific examples include Rheodol 5P-LIO (lauric acid ester), Rheodol 5P-LIO
-PLO (palmitic acid ester), 5P-8IO (
Stearic acid ester) (manufactured by Kao ■), Nilacol 5L-10 (lauric acid ester) 1, Nilacol 5P-10
(palmitic acid ester), 5S-10 (stearic acid ester) (manufactured by Nikko Chemical ■), etc., and the amount used is preferably 0.1 to 10% by weight based on the total amount of ink, and 5 or more. In addition to the ingredients listed above, moisturizing and/or
Alternatively, a water-soluble organic solvent may be used to prevent freezing. Examples include alcohols such as methanol, ethanol, propatool, isopropanol, butanol, isobutanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1.3-butylene gellicol, thiodiglycol, etc. Glycols, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether, diethylene glycol monomethyl ether, N-methyl-2-pyrrolidone, sorbitol,
Examples include sorbitan, acetin, glycerin, and the like. These water-soluble organic solvents can be used alone or in combination. The amount used is 1 to 50% of the total amount of water-based ink.
Weight percent is preferred.

Furthermore, various additives are selected and used as appropriate, such as preservatives and fungicides, moisturizing aids such as urea, thiourea, ethylene urea, and their derivatives, and rust preventive agents and antifoaming agents to prevent corrosion of metal parts. You can also.

This water-based ink is prepared by mixing and stirring using a commonly known stirrer when dyes are used as colorants, and by mixing and dispersing using commonly known dispersing machines when using pigments. It can be easily obtained by

[Function] Sorbitan fatty acid ester is insoluble or poorly soluble in water, and is semi-dissolved in water-based ink. Therefore, in the pen tip, it forms a film on the surface to suppress water evaporation. Therefore, the pen tip has excellent drying resistance. In addition, sorbitan fatty acid ester does not have hygroscopic properties, unlike conventionally used hygroscopic water-soluble organic solvents, and since only a small amount is required, it is assumed that sorbitan fatty acid esters dry handwriting well. Ru.

I think that the.

[Example] The present invention will be explained in more detail with reference to Examples below. In the Examples, the term "parts" simply indicates "parts by weight."

Acid Black 2 8.0 parts Ethylene glycol 20.0 parts Sorbitan monolaurate 1.0 parts Water
71.0 parts each of the above ingredients 40~
Aqueous black ink was obtained by heating to 50° C. and stirring for 2 hours.

Lost Yutaka I C, 1, Basic Red 14 2.0 parts Glycerin 5.0 parts Sorbitan monolaurate 5.0 parts Broxel GXL
0.2 parts (preservative, manufactured by CIC) Water 87.
8 parts Aqueous red ink was obtained using the same ingredients as in Example 1.

Daigoso Rhishi C, R, Direct Blue 86 7.0 parts Propylene glycol 7.0 parts Thiodiglycol 5.0 parts Sorbitan monolaurate 10.0 parts Benzotriazole (rust inhibitor)
0.2 parts water
70.8 parts Aqueous blue ink was obtained using the same ingredients as in Example 1.

Shosekisui C, 1, Acid Black 2 8.0 parts Ethylene glycol 20.0 parts Sorbitan monopalmitate 1.0 parts Water
71.0 parts Aqueous black ink was obtained using the same ingredients as in Example 1.

Loss of Seitan C, 1, Basic Red 14 2.0 parts Glycerin 5.0 parts Sorbitan monopalmitate 5.0 parts Broxel GXL
0.2 parts water
87.8 parts A water-based red ink was obtained using the same ingredients as in Example 1.

Fork ■tan C0■, Directb/L/-867, 0 parts propylene glycol 7.0 parts thiodiglycol
5.0 parts Sorbitan monopalmitate 10.0 parts Benzotriazole
0.2 parts water
60.8 parts A water-based blue ink was obtained using the same ingredients as in Example 1.

Kanchogae C, 1, Acid Black 2 8.0 parts Ethylene glycol 2o, 0 parts Sorbitan monostearate 1.0 parts Water
71.0 parts Aqueous black ink was obtained using the same ingredients as in Example 1.

Kabuki C, 1, Basic Red 14 2.0 parts Glycerin 5.0 parts Sorbitan monostearate 5.0 parts Broxel GXL
0.2 parts water
87.8 parts A water-based red ink was obtained using the same ingredients as in Example 1.

Loss Pruner C, 1, Direct Blue 86 7.0 parts Propylene glycol 7.0 parts Thiodiglycol 5.0 parts Sorbitan monostearate 10.0 parts Benzotriazole
0.2 parts water
60.8 parts A water-based blue ink was obtained using the same ingredients as in Example 1.

1L Main carbon black 8.0 parts Ammonium salt of styrene-acrylic acid copolymer 8.0 parts Ethylene glycol 5.0 parts Sorbitan monolaurate 5.0 parts Broxel GXL
0.2 parts water
73.8 parts The above components were mixed, stirred and mixed using a stirrer for 2 hours, further dispersed and mixed using a sand mill for 10 hours, and coarse particles were removed by filtration etc. to obtain a water-based black ink. Nishanage - Bomb black 8.0 parts Ammonium salt of styrene-acrylic acid copolymer 8.0 parts Ethylene glycol 5.0 parts Sorbitan monopalmitate 5. Q part broxel GXL
0.2 parts water
73.8 parts A water-based black ink was obtained using the same ingredients as in Example 1.

Large ILfl Top 1 Carbon black 8.0 parts Ammonium salt of styrene-acrylic acid copolymer 8.0 parts Ethylene glycol 5.0 parts Sorbitan monostearate 5.0 parts Broxel GXL
0.2 parts water
73.8 parts A water-based black ink was obtained using the same ingredients as in Example 1.

Le Kanfengyo C, 1, Acid Black 2 8.0 parts Ethylene glycol 20.0 parts Water
72. Part O Aqueous black ink was obtained using the same ingredients as in Example 1.

Tan Gloss Kanshu C, 1, Acid Black 2 8.0 parts ethylene glycol 20.0 parts glycerin
20.0 parts water
71.0 parts [Effect of the invention] The water-based inks obtained in Examples 1 to 12 and Comparative Example 1.2 were applied to a writing instrument (UN50,
(manufactured by Pentel ■) was filled with 2.8 g, and a test was conducted. The results are shown in Table 1.

Pen tip drying resistance test: At a temperature of 18°C and a humidity of 65%, the writing instrument is left with the cap removed, and handwriting is performed on high-quality paper.The time until the handwriting becomes blurred (unit: 2 minutes) ) was measured.

Handwriting drying test: Handwriting is performed on a film (made of polypropylene), and high quality paper with a load of 500 g is placed over the handwriting, and the time until ink transfer stops occurring (
(unit: 2 seconds).

As described above, the present invention is a water-based ink with excellent pen tip drying resistance and handwriting drying properties, and can be used not only for writing instruments but also as an ink for recorders, stamps, inkjet recording, etc. It is something.

Claims (1)

[Claims] A water-based ink comprising at least a colorant, water, and sorbitan fatty acid ester.