JPS63139965A - Ink for writing utensil - Google Patents

Abstract

PURPOSE:To obtain an ink for writing utensils, which can be well discharged and allows prolonged writing, by using a specified org. compd. as an ink discharge improver. CONSTITUTION:An ink for writing utensils contains a compd. of the formula (wherein n is 1-10; R is an alkyl; X is an alkali metal, H, ammonium or an alkanolamine). Said compd. can be used in both water ink and oil ink and is used in an amount of pref. 0.1-10wt%. Said ink for writing utensils can be easily prepd. by mixing ingredients by stirring with a stirrer when only a dye is used as a colorant, or by dispersing a pigment in a dispersion mixer and removing coarse particles by centrifugation or filtration when a pigment is incorporated in the colorant. The compd. of the formula has an ability to improve the wetting of points of pens so that the dischargeability of the ink is improved, blurring is hardly caused and prolonged writing becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ink for a writing instrument that has good ink ejection and a long writing distance.

(Prior Art) In recent years, writing instruments have been required to have finer handwriting, and there is a trend toward smaller diameter pen nibs for both writing instruments that use water-based ink and those that use oil-based ink.

(Problems to be Solved by the Invention) However, as a result of making the pen tip thinner in order to obtain thin handwriting, the ink ejection becomes less and smudges are more likely to occur, resulting in a shorter writing distance. A point occurred. Therefore, attempts have been made to add various surfactants in order to increase the amount of ink ejected, but none have been found to be fully satisfactory.

(Means for Solving the Problems) The present inventors completed the present invention as a result of intensive research to solve the above problems. That is, the gist of the present invention is an ink for writing instruments characterized by containing a substance represented by the following general formula.

R-0-(OH2CH2O)n-CH2000X The present invention will be explained in detail below.

This is the gist of the present invention. The substance represented by the following general formula is used as an ink discharge improver, and can be used in both water-based and oil-based inks, but the amount used is 0.
1 to 10% by weight is preferred.

Further, in the following general formula, the number of n is 1 to 10 because if n is 11 or more, the desired ejection improvement will be significantly reduced or not be obtained.

The substances listed below are applicable to X.

Alkali metals such as Na, etc. ammonium Monoethanolamine, jetanolamine.

Alkanolamine R-0-(0112C!H20)n-CH2COOX such as triethanolamine, di-methylethanolamine Dyes such as , acid dyes and direct dyes, and pigments such as inorganic pigments and organic pigments can be used singly or in combination.

Among them, carbon black is used as a coloring agent.

It is preferable to use pigments such as azo pigments, phthalocyanine pigments, and titanium oxide. It can be used as 1
As a dispersion stabilizer, water-soluble natural polymers such as glue or water-soluble synthetic polymers such as Popal can be used singly or in combination.

In addition to water, solvents include glycols such as ethylene glycol and propylene glycol.

Alkanolamines such as monoethanolamine and cellosolves such as ethylene glycol and methyl ether can be used alone or in combination.

Furthermore, preservatives, rust preventives, fungicides, etc. can be added as necessary.

Here, when adding the substance represented by the above general formula to an aqueous ink, it is preferable to use an alkyl group having a carbon number of 5 to 17 as R.

Next, to explain the case where it is applied to oil-based ink, two coloring agents are metal-containing dyes that are commonly used in the past,
Dyes such as oil-soluble dyes and pigments such as inorganic pigments and organic pigments can be used alone or in combination.

Solvents include alcohols such as ethanol.

Ketones such as methyl ethyl ketone, esters such as ethyl acetate, aromatics such as benzene, and cellosolves such as ethylene glycol monomethyl ether can be used alone or in combination. As the resin, conventionally used natural resins and synthetic resins such as rosin resins, phenol resins, and polyvinyl butyral can be used alone or in combination.

Furthermore, rust preventives, surfactants, etc. can be added as appropriate.

When the substance represented by the above general formula is added to the oil-based ink, n is 1, 2. It is preferable to use an alkyl group having 10 to 17 carbon atoms as l't.

Next is a method for preparing ink for writing instruments.

If the colorant is only a dye, it can be easily obtained by stirring and mixing the above components using a known stirrer.If the colorant contains a pigment, the pigment can be mixed using a known disperser. It can be obtained by dispersing and removing coarse particles by centrifugation or filtration.

(Function) It is not clear why the ink for writing instruments according to the present invention has good ink ejection, long writing distance, and little bleeding when written, but it is speculated as follows. In other words, it is thought that the compound represented by the above general formula improves the wetting of ink to the pen tip member, resulting in better ink ejection, less smearing, and longer writing distance. It will be done.

(Example) This will be explained in more detail below with reference to Examples.

In Examples and Comparative Examples, "parts" simply indicate "parts by weight."

Example 1 Carbon black 160 parts styrene
Ammonium salt of acrylic acid (dispersant) 4.5 parts C,4
H2,-0-(C!H2CH2O)3-OH200ON
a α9-part propylene glycol
2! LO part triethanolamine
40 parts benzotriazole (rust inhibitor) 15 parts water
50.1 parts of the above ingredients were blended and milled in a ball mill.
Dispersion was carried out for 0 minutes, and then coarse particles of the deer pump rack were removed by centrifugation to obtain a black water-based ink.

Comparative Example 1 From Example 1 0.4H29-0-(CH2CH20)3
(E A black water-based ink was obtained in the same manner as in Example 1 except that H2000N a was removed and water was increased by that amount.

Example 2 0.1. Direct Black 38 (direct dye)
8.5 parts C+zH3s-0(OH2CH20)4-CH2000
K O, 2 parts ethylene glycol 190 parts water
72. 4 each of the above items on the 3rd part
A black water-based ink was obtained by heating to 0 to 50°C and stirring for 2 hours.

Comparative Example 2 Example 2 0,7H,5-0-(C!H2CH2O)
A black water-based ink was obtained in the same manner as in Example 2, except that 4-CH2CH2K was removed and water was increased by the same amount.

Example 3 0.1. Ac1d Red 51 0.9 parts (acid dye) Carbon black 12.0 parts Styrene-maleic acid sodium salt 50 parts 06H,3
-O-(OH2CH2O)8-OH00ONH30,1
Part ethylene glycol 13.0 parts Thiodiglycol 70 parts Formalin (preservative) 05 parts Water
6 5 5 parts The above items were blended and dispersed in a sand mill for 3 hours, and then coarse particles of carbon black were removed by filtration to obtain a black water-based ink.

Comparative Example 3 Carbon black 160 parts 0, H1
5-0-(OH,2CH2O) 15-CH200ON
a 4.5 parts propylene glycol 23.0 parts benzotriazole
1.5 parts (rust inhibitor) water
50.1 parts of the above components were blended and dispersed in a ball mill for 300 hours, followed by centrifugation to remove coarse carbon black particles to obtain a black water-based ink.

Example 4 C, 1, Ac1d Blue 90 6.0
Part C2oH4, -0-(OH2CH2O), (, -CH
2000N a 0.5 parts ethylene glycol 20 parts glycerin
10 parts formalin (preservative)
α4 part water
6 5 1 part each of the above ingredients at 40-50%
A blue water-based ink was obtained by heating to °C and stirring for 2 hours.

Example 5 C,1,Pigment Red17 7.0
50 parts styrene-acrylic acid sodium salt 02H5-
0be CH2CH20) 8- CH2000N a (L 9 parts ethylene glycol 25.0 parts benzotriazole (rust inhibitor) 1.0 part water
6 5 1 parts of each of the above ingredients were blended, dispersed in a ndzel for 3 hours, and then centrifuged to obtain O, I.

Coarse particles of Pigment Red 17 were removed to obtain a red water-based ink.

Example 6 0.1.5olvent Red 81 (oil-soluble dye)
5.5 parts C17H35-0-(CH2CH20)2-OH200
0H0.5 parts Hytanol 1501 (Phenol Resin 1, manufactured by Usutate Kasei ■) 5.6 parts Ethylene glycol monomethyl ether 8 days 6 parts The above components were stirred for 2 hours to obtain a red oil-based ink.

Comparative Example 4 From Example 6 C47H55-0-(CH2CH20)2
A red oil-based ink was obtained in the same manner as in Example 6, except that -CH2C00H was removed and ethylene glycol monomethyl ether was increased by the same amount.

Example 7 Copper phthalocyanine blue 15.0 parts OH, O
H2, -0-CH2CH20-CH2COOHα5 parts Gum rosin WW (rosin resin, manufactured by Yasuhara Kogyo ■) 6.0 parts Coarse particles of copper phthalocyanine blue were removed to obtain a blue oil-based ink.

Comparative Example 5 Example 7, 901oH21-0-OH2CH2O-C
A blue oil-based ink was obtained in the same manner as in Example 7, except that H2COOH was removed and xylene was increased by the same amount.

(Effects) 2.4 I of the inks of Examples 1 to 5 and Comparative Examples 1 to 3 were filled into Superpol BH16 (manufactured by Bentel ■) and two quality tests were conducted.

Table 1 shows the resultant nails.

Table 1 *1 Ink discharge amount... River... JIS P 3
201 Renki paper A, load 100J', writing angle 70;
'Write bright lines at a writing speed of 7 cm/sec.

The amount of ink ejected when writing for 200 m was measured.

*2 Writing short distance... *1 Continuous writing under the same conditions as the ink discharge amount, checking for traces of bamboo leaves every 100 m, and measuring the writing distance at the speed at which smearing occurred.

The inks of Example 6.7 and Comparative Examples 4 and 5 were used as a signature pen.
A quality test was conducted by filling tel 8570 (manufactured by Pentel ■) with 1.4P. The results are shown in Table 2.

Table 2 *3 Ink discharge amount...JIS, P
3201 Note Paper A was spirally written at a load ztoop, a note angle of 60°, and a writing speed of 10 cm/sec, and the amount of ink discharged when writing was performed for 200 m was measured.

As described above, the ink for writing instruments according to the present invention is as follows.

It has excellent properties such as a good ink discharge rate and a long writing distance.

Claims (1)

[Claims] An ink for writing instruments R-O-(CH_2CH_2O)_n-CH_2COO characterized by containing a substance represented by the following general formula.
X (n is an integer of 1 to 10; R is an alkyl group; X is an alkali metal, H, ammonium, alkanolamine)