KR830002105B1 - Ink composition - Google Patents

Abstract

No content.

Description

Ink composition

The present invention relates to an aqueous ink composition.

性) 무기화합물을 첨가하는 일 등이 제안되고 있지만, 특히 보존안정성, 내건조성 등의 점에서 충분히 만족할만한 것이라고는 도저히 말할 수 없었다.Conventionally, water-based ink compositions used in fountain pens, sine pens, aqueous felt-tip pens, aqueous ball-point pens, etc. (1) ink is evaporated during long-term storage in ink containers or writing instruments, and the pen tip is clogged, or the dye in the ink is deposited. It is easy to cause discoloration and decrease in density and decreases handwriting. (2) If the cover of the writing instrument is removed and left unattended, it dries in a very short time and the ink passage is blocked, and writing is impossible. (3) The ink discontinuity part due to air bubbles is likely to occur in the ink passage in the writing instrument, and smooth writing cannot be performed. (4) Increasing the dye concentration lowers the storage stability, and thus has various disadvantages, such as not being able to make the dye concentration too large. In order to alleviate such drawbacks, water-soluble organic solvents such as polyhydric alcohols, such as glycols and glycerin, glycol ethers and glycol ethers, are added to the aqueous ink composition, or used in combination with the above solvents, such as lithium chloride and calcium chloride. Hygroscopicity

Although addition of an inorganic compound has been proposed, it cannot be said that it is sufficiently satisfactory, especially in terms of storage stability and dry resistance.

The present inventors have made various studies in light of the current state of aqueous ink, and as a result, the following general formula

(I) wherein R ₁ , R ₂ , R ₃ and R ₄ are

Which is the same or may be different at least one, and n is an integer of 0 or 1 to 3; and N, N, N ', N', -tetrakis- (2-hydroxy) The addition of alkyl) -ethylenediamine has found that an aqueous ink composition can be obtained that satisfactorily resolves the above disadvantages and finally completes the present invention.

The amount of the ethylenediamine of the formula (I) used in the present invention may vary greatly depending on the field of use of the ink, the type and concentration of the dye, and the type and amount of other additives used according to the need. It fully demonstrates the effect of using). Ethylenediamine can be used up to 80%, but if it exceeds 70%, it is preferable to use at least 5% water.

As the dye used in the present invention, known water-soluble acid dyes, direct dyes, and basic dyes may be mentioned, but examples thereof are as follows.

1. Acid Dyes

Eosin (CI 45380), Nigrosin NB Conk (CI 50420), Water Blue # 9 (CI 42090), Turtle Gene (CI 19140), Kayasyl Pure Blue FGA (CI 42080), Acid Violet B (CI 42640) .

2. Direct dye

Direct Die Black XA, Direct Die Black EX (C.I. 30235), Caylar's Black G-Conk (C.I. 35225), and the like.

3. Basic dye

Rhodamine B (C.I. 45170), rhodamine 6GCP (C.I. 45160), makisilonlybriantpravin 10GFF, methyl violet (C.I. 42535), and the like.

The amount of the dye may vary depending on the field of use of the ink, the type of the dye, and the type and amount of other additives used according to the need, but is usually 0.1 to 30% of the weight of the ink composition, preferably about 0.5 to 10%.

In addition, since some basic dyes may cause precipitation or discoloration in the presence of the specific diamine used in the present invention, it is preferable to limit the amount of use thereof or to not use them. These include Chrysoidine (C.I. 11270), Marach Kite Green (C.I. 42000), Eisen-Catrone Orange RH (C.I. 48040), Eisen-Catrone Yellow 3GLH (C.I. 45055).

劑)등이 예시된다.The ink composition of this invention can add 1 type (s) or 2 or more types of well-known additive as needed. As such additives, water-soluble organic solvents such as glycol, glycol ether, and glycol ether esters, anionic or nonionic surfactants, sodium benzoate, potassium sorbate, sodium pentachlorophenol, preservatives such as phenol, benzotriazole, etc. Antirust agent (.

I) is exemplified.

The ink composition of the present invention is prepared by, for example, adding ethylenediamine and dye of the above formula (I) and other additives simultaneously or sequentially, as necessary, to water and stirring until a uniform composition is formed at room temperature to about 50 ° C.

The ink composition of the present invention has the following excellent properties.

(i) Even during long-term storage in a container or writing utensil, it hardly dries and deteriorates, and good writing property persists.

(ii) Since the lid of the writing instrument is not easily dried even if it is left uncovered, the phenomenon such as inability to write or deterioration in writing performance due to clogging of ink in the writing instrument is also prevented.

(iii) Ink discontinuities are rarely formed in the ink passage, and they are immediately eliminated even when they occur, so that an improved continuous smooth writing is guaranteed.

(Ⅳ) Because of its high concentration and excellent storage stability, it is not used as a dye sedimentation even in winter and cold places.

(Iii) It can be used not only as ink for writing utensils but also as ink for stamps, printing, recording systems, and the like.

Example 1

Dye and N, N, N ', N'-tetrakis- (2-hydroxypropyl) -ethylene diamine are added to water in the following ratio and stirred at about 30 DEG C for 2 hours to obtain a red ink.

Eosin 5.0 parts by weight

25.0 parts by weight of N, N, N ', N-tetrakis- (2-hydroxypropyl) -ethylenediamine

70.0 parts by weight of water

Example 2

Each raw material is added to water at the following ratio, and it stirred at about 30 degreeC for 2 hours, and obtains a red ink.

Eosin 5.0 parts by weight

Tertradine 2.0 parts by weight

18.0 parts by weight of N, N, N ', N-tetrakis- (2-hydroxypropyl) -ethylenediamine

10.0 parts by weight of ethylene glycol

1.0 parts by weight of sodium benzoate

0.1 weight part of polyoxyethylene alkyl ether (trademark Skorow # 400 Atlas Co., Ltd. product)

63.9 parts by weight of water

Example 3

Each raw material is stirred and mixed at about 40 ° C. for 2 hours at the following ratio to obtain a blue ink.

Water blue # 9 6.0 parts by weight

20.0 parts by weight of N, N, N ', N-tetrakis- (2-hydroxypropyl) -ethylenediamine

Ethylene glycol 6.0 parts by weight

Glycerin 2.0 parts by weight

1.0 parts by weight of sodium benzoate

0.1 weight part of polyoxyethylene alkyl ether (the same product as Example 2)

64.9 parts by weight of water

Example 4

Using each of the following starting materials, a green ink was obtained in the same manner as in Example 2.

Water blue # 9 4.0 parts by weight

Teradin 4.0 parts by weight

15.0 parts by weight of N, N, N ', N-tetrakis- (2-hydroxypropyl) -ethylenediamine

Polyethylene Glycol # 300 (Recall) 10.0 parts by weight

1.0 parts by weight of sodium benzoate

0.1 parts by weight of polyoxyethylene alkyl ether (trade name Noigen, product of P.Ig. Co., Ltd.)

65.9 parts by weight of water

Example 5

Black ink is manufactured using each raw material of the following ratio. First, water nigrosin NB conk and water black # 100 are mixed, and then the remaining raw materials are added thereto, followed by stirring at about 35 ° C. for 2 hours to obtain an ink.

Nigrosine NB Conk 2.0 parts by weight

Water Black # 100 5.0 parts by weight

N, N, N ', N-tetrakis- (2-hydroxypropyl) -ethylenediamine 17.0 parts by weight

Thiodiglycol 5.0 parts by weight

Ethylene Glycol 4.0 parts by weight

0.5 parts by weight of solvate

0.1 weight part of polyoxyethylene alkyl ether (the same product as Example 2)

66.4 parts by weight of water

[Reference Examples 1 to 5]

The ink compositions obtained in Examples 1 to 5 were placed in the dosing bottles, respectively, and left at 50 ° C. and 0 ° C. for 3 months. No precipitation or discoloration was observed and good dissolution stability was observed.

[Reference Examples 6 to 10]

The ink compositions obtained in Examples 1 to 5 were used as inks for commercially available pens, the caps of the sign pens were removed, and left for 20 days at 20 ° C. and 60% RH, followed by writing. Since the drying of the pen tip was hardly seen, smooth handwriting was developed immediately, and it was no different from a cap with a cap. In addition, even when the ink compositions obtained in Examples 1 to 5 were used for plastic pens and ballpoint pens, stable good writing performance was observed over a long period of time, and ink dropped or uneven handwriting even with intermittent use. Or things that didn't come out very well.

Comparative Example 1

In Example 1. Instead of N, N, N ', N-tetrakis- (2-hydroxypropyl) -ethylenediamine, the ink compositions which were re-added in the same amount of water, respectively, dried quickly and were hardly practical.

Comparative Examples 2 to 5

In Examples 2 to 5, instead of N, N, N ', N-tetrakis- (2-hydroxypropyl) -ethylenediamine, four kinds of ink compositions in which the same amount of water was added again were obtained.

When any of the inks 2 to 5 were used as the ink for the sign pen, the pen tip was dried within 1 to 3 days after removing the lid, and the use of the sign pen became impossible.

Claims (1)

General formula in aqueous solution of dye

An ink composition comprising at least one kind of N, N, N ', N-tetrakis- (2-hydroxypropyl) -ethylenediamine represented by. [(I) wherein R ₁ , R ₂ , R ₃ and R ₄ are

The group represented by may be the same or different at least one, n is 0 or an integer of 1 to 3.