JPS5959755A - Water ink - Google Patents

Abstract

PURPOSE:To provide a water ink which has good resistance to drying, does not cause a rapid increase in viscosity and has good dye-solubility, by adding an adduct of ethylene oxide and propylene oxide with a glucose derivative to an aq.soln. of a water-soluble dye. CONSTITUTION:An adduct of ethylene oxide and/or propylene oxide with a glucose derivative is blended with an aq. soln. of a water-soluble dye to obtain the desired water ink. As the glucose derivative, glucose or methyl glucose to which 1-50mol of ethylene oxide has been added is preferred in the case of ethylene oxide, and glucose or methyl glucose to which 1-30mol of propylene oxide is added is preferred in the case of propylene oxide. The glucose derivative is used in an amount of 0.5-30wt% based on the total amount of water ink when used as a writing ink.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-based ink suitable for writing instruments, stamps, printing, and recording materials. The present invention relates to a water-based ink having excellent properties.

Traditionally, for example, writing instruments, specifically textiles.

Fell l-, writing instrument with a pen tip using monofilament,
Or in capillary writing instruments such as ballpoint pens and fountain pens,
Even if the pen tip is exposed to the atmosphere for a long time during storage or when the cap is removed from the writing instrument body, the ink will always flow out smoothly without damaging the ink flow path of the pen tip, making writing extremely easy. There was a need for a water-based ink that could be applied smoothly.

In order to meet this demand, water-soluble organic solvents such as glycol solvents, glycol ether solvents, and glycol ether ester solvents, or hygroscopic inorganic compounds such as lithium chloride and calcium chloride are included in the aqueous solution of water-soluble dyes to make them dry-resistant. Water-based inks with improved dryness resistance have been known, but none have satisfactorily achieved dryness resistance.

The reason for this is that glycol solvents generally have high viscosity,
Due to its high boiling point, the viscosity of the ink is higher, and when used in the above-mentioned writing utensils that require low viscosity, the outflow of the ink is inhibited, causing the ink to run out, and the handwriting is difficult to dry. There are drawbacks such as inferior abrasion resistance afterward, and there is a limit to the amount of 16- to be used, making it impossible to add enough 16- to sufficiently improve dryness resistance.

Glycol ether solvents and glycol ether ester solvents generally have a low surface tension cuff 5E, so the ink tends to bleed, and the ink may penetrate to the back side of the paper or smudge on the surface, making it impossible to obtain clear handwriting. There are disadvantages such as increasing the viscosity of the ink and strong odor.
Similarly to the above, it is not possible to add enough amount to satisfy the drying resistance.

Lithium chloride and calcium chloride react with dyes to form salts and reduce the solubility of dyes, making it difficult to prepare high-concentration inks, and when high-concentration inks are required, drying-resistant properties 614, an inconvenient drawback arises.

Therefore, the inventors of the present invention have conducted various studies to eliminate the conventional problem of tilting up the M.As a result, when a glucose derivative with ethylene oxide and/or propylene oxide added to an aqueous solution of a water-soluble dye is blended, if The present invention was completed after discovering that it is possible to obtain a water-based ink that has good drying properties, does not cause a sudden increase in viscosity, and has good dye solubility.

That is, one aspect of the present invention is a water-based ink in which a glucose derivative to which ethylene oxide and/or propylene oxide is added is blended into an aqueous solution of a water-soluble dye.

When the glucose derivative of the present invention is used, the solubility of the dye is increased, the hygroscopicity is good, and the dye in the ink does not solidify at room temperature, and the cap is removed and left in the atmosphere for a long time. Even if the ink at the pen tip does not evaporate, an ink with excellent drying resistance can be obtained.

Hereinafter, one aspect of the present invention will be explained in detail.

In the case of ethylene oxide, the glucose derivative used in the present invention is preferably glucose or methyl glucose added with 1 to 50 moles, and in the case of theariapropylene oxide, glucose or methyl glucose added with 1 to 30 moles is suitable. be.

Further, the amount of the glucose derivative to be used may be changed as appropriate depending on the purpose. For example, when used as an ink for a commode marking device, it is preferably 0.5 to 30 times the total amount of the aqueous ink.

As water-soluble dyes, most water-soluble acid dyes, basic dyes, and direct dyes can be used. To give a specific example, Eiseneon G is an acid dye.
J((0,1,45380).

Water plaque $21 (C, 1,15985°42
090.42745 mixed dye), Nigronon NB Conc (C', 1.50420'), Water Blue $9 (C, L42090), Water Pink $9
2(0,i,454jO), Kayakkutrazine (
C, Li 9140), etc. As a basic dye, Victoria Blue F 4 B (C, 1°42563)
, Victoria Blue FB (C,I.

4404 s), methyl violet FN (0,
I.

42535), Rhodamine 6 G CI) (C,
J.

45160) etc. As a direct dye, Water Plaque $100 (0,1,,35255).

Direct Deep Black EX (C, J,.

35225), Direct Deep Plack XA,
(manufactured by Sumitomo Chemical ■), Direct First Black Conch (0,1,27720), etc.

These dyes can be used alone or in combination with other water-soluble dyes. The amount of water-soluble dye to be used may be changed as appropriate depending on the purpose, but for example, when used as an ink for writing instruments, it is best to use 0.5 to 15% by weight based on the total amount of water-based ink. Get results.

As shown above, the present invention greatly improves drying resistance by adding a glycose derivative to an aqueous solution of a water-soluble dye. ,
Solvents such as dimethyl sulfoxide, 2-pyrrolidone, and N-methyl-2-pyrrolidone, or preservatives may be appropriately selected and used.

A practical example of the present invention will be described below regarding ink for writing instruments.

In addition, in the examples, it says "1 part" in "S" and "Sliding part" in DL.
shall be shown.

Example Water Black $21 (Cj, J, 15985.
6.5 parts 42090.42745 mixed dye.

(manufactured by Orient Chemical Industry ■) Nige o'/7 N 13-1'/ri (0,1,5
0420,1, On Sumitomo Chemical Co., Ltd.) Formalin (preservative) 1.
ott ethylene glycol 20
．． OI/ethylene oxide 10 moles added glucose 5. Q7/Wednesday
665 Among the above components, first mix ethylene glycol and water, then add the remaining components to the mixed solution (mix for about 1 hour at 40 to 50 minutes).
Stir while heating to 'C' to make ink. This ink has good color strength, good adhesion properties on writing paper, and does not bleed or bleed when used on photographic paper. Also, the drying resistance of this ink is at a temperature of 20℃ and a humidity of 65℃.
% conditions, the pen tip will not dry and writing will be possible even if the cap is removed from a writing instrument using a porous or capillary tip made of fiber, felt, or monofilament I and left for 10 days. Ta.

Note that an ink obtained by removing 1 mmol of ethylene oxide and adding water from this formulation and adding that amount of water dried in about one day under the same conditions.

Example 2 Water black $ 100 6.5
Part (C, 1, 35255, manufactured by Orient Chemical Industry ■) Sodium pentachlorophenol (preservative) 1.
On ethylene glycol 20.
Q tt Propylene oxide 20 mole added glucose 1 Q, Q tr water
62.5 parts The ink prepared by mixing, heating, and stirring the above components as in Example 1 has good writing characteristics and can be used for 10 days after camping at the same fl location as Example 1. I was able to write without the nib of the pen drying out even when I was out and about. In addition, an ink obtained by removing the added glucose and adding water only for that purpose dried at F/18 under the same conditions.

Example 6 Victoria Brute Formalin 10〃Diethylene glycol 200〃Engineered tylene oxide 10 mole added methylglucose 1
00〃B1111 Pyreneogizide 10 moles Added glucose 5.0〃Water
5 8 0
〃-''The ink prepared by mixing, heating, and stirring the two components as in Example 1 has good writing characteristics, and it can be left for 60 days with the cap removed under the same conditions as Example 1. The pen tip did not dry out and I was able to write even after leaving the pen on. Note that an ink obtained by removing 10 moles of ethylene oxide and 10 moles of propylene oxide from this formulation and adding water by that amount dried in about 5 days under the same conditions.

Although the present invention has mainly been described above with reference to water-based inks for writing instruments, it can also be applied to water-based inks for stamps, printing, recorders, etc.

Patent applicant Bell de 6 Co., Ltd.

Claims (1)

[Claims] A water-based ink containing a glucose-induced barrel obtained by adding ethylene oxide and/or 1-propylene oxide to an aqueous solution of a water-soluble dye.