JPS5974175A - Ink composition for water-base ball point pen - Google Patents

Abstract

PURPOSE:To provide an ink compsn. for water-base ball point pens excellent in capping-off property, having moderate viscosity and fluidity, and without preventing ink from running even when writing speed increases, by incorporating a particular amt. of xanthane gum. CONSTITUTION:An ink compsn. contg. 0.20-0.45wt% xanthane gum. Said compsn. is composed of, for example, 5-40wt% aqueous medium comprising water, alone or together with alcohol, glycol ether, etc., 0.1-15wt% water- soluble or -dispersible colorant, 0.01-10wt% additives such as surfactant, preservative, pH adjustor, or rust preventive, and 0.20-0.45wt% xanthane gum. When the amt. of xanthane gum added is below 0.20wt%, smooth writing is impossible, while when it exceeds 0.45wt%, the viscosity of ink is increased to prevent ink from running from the tip of pens.

Description

[Detailed description of the invention] The present invention relates to an ink composition for a water-based ballpoint pen.

Water-based hole pen inks are lagging behind in cap-off properties (the property of remaining hot for a long time with the cap off of a ballpoint pen), and are uniformly thick to correspond to the PJt standard diameter ball. It has a suitable viscosity or fluidity that enables smooth writing, it does not run out of ink even at high writing speeds, it does not leave ink scum after writing, and it lasts for a long time. It is necessary to have properties such as excellent storage stability and no corrosivity to metal parts of ballpoint pens. However, these properties include elements that are contradictory to each other; for example, known inks that have excellent cap-off properties tend to have a tendency to run out due to their viscosity. Therefore, there is much room for improvement in the existing inks, and the emergence of new inks is desired.

As a result of various experiments and research while keeping the above-mentioned current situation in mind, the present inventor has found that when a specific amount of xanthan gum is added to a water-based ballpoint pen ink, an ink having all of the above-mentioned properties can be obtained. I found out. That is, the present invention relates to an aqueous ballpoint pen ink composition characterized by containing 0.20 to 0.45% by weight of xanthan gum.

The xanthan gum used in the present invention has a molecular weight of 5 million to
It is a water bathing polymeric polygonum with a size of about 10 million. The amount of xanthan gum used is 0.20 to 0.45 in the ink composition.
Weight%. If the violet content of gisanthan gum is less than 0.20%, it is difficult to write smoothly;
If it exceeds %, the viscosity of the ink increases and the outflow of the ink from the pen tip tends to be inhibited. The xanthan gum content f, t is 0.80 to 0.4 in the ink composition.
More preferably, the content is 0% by weight.

The components other than the goat/tan gum in the water-based ballpoint pen ink composition of the present invention are not particularly different from the components in known water-based ballpoint pen inks.

That is, the ink composition of the present invention contains, for example, an aqueous medium consisting of water or water and alcohol, glycol ether, etc.
Offi pulp %, water-soluble or water-dispersible colorant 01-151
m%, additives such as surfactants, preservatives, pH regulators, rust preventives, etc. 0.0l-1ON amount% and xanthan gum 0,-2
It is composed of 0 to 0.45% by weight. Examples of components other than xanthan gum are as follows.

(2) Aqueous medium component 1, -hydric alcohol: Alcohol miscible with water, such as ethanol and Ia7'cr hill alcohol.

2. Dihydric alcohols 1) Ethylene glycol, il) Diethylene glycol, l) )! J ethylene glycol, IV) Ho!
J ethylene glycol (S200~#1000).

V) 1,8-propanediol, ■1) Probile/glycol, Vil) 1,3-butylene glycol.

Vm) 1,4-purfudiol + IX) 2 + 3
- bunarenoglycol, X) neopentyl glycol.

XI) Hexylene glycol, X1l) Thiodiglycol, etc.

8. More than trihydric alcohol 1] Glycerin, 11) Trimethylolethane.

1) trimethylolpropano, IV) 3-#flupenotane-1.8.5-) lyol, V) diglycol,
■1) Sorvit et al.

4. Others...pyrrolidone, N-methyl-2-pyrrolitono, dimethylformamide, etc.

■ Glycol ether 1) Ethylene glycol monoethyl ether.

I+) Ethylene glycol monoethyl ether.

1) x-f-v noglycol monobutyl ether.

1■) Diethylene glycol 7-methyl ether.

■) Diethylene glycol monoethyl ether.

vl) diethylene glycol monobutyl ether, etc.

10 N colorant l, pigment 1) Titanium oxide, 11) Carbon black.

i) Carmini/6 B, lv) C, 1, Pig
ment Red112°V) C, 1, Pigme
nt Beue 15, IV) C,i,Pigm
entGreen 7 etc.

2.Ac
1d Red 87, If) Ac1d Red
92.

1i1) Ac1d Yeggow 23 + IV
) Ac1d Beue 9.

V) Acid Violet 49, Vl) A
cid Blue 7.

Vll) Ac1d Orange 56,
Vfil) Ac1d Baack 2.

IX) Ac1d Red 18 etc.

8. Direct dye (indicated by C, 1, number) I) D
Direct Rack 19. If) Direct
t Bgack 88°1) Direct Beac
k 154. IV) Direct Orange
6゜y) Direct Yeegow 44 + v
l) Direct: Yeegow 87°'71)
Direct Beue 71, VIII)
Direct Bj? ack 19 etc.

■ Thrust agent summer, nonionic and anionic surfactants 1) Polyethylene glycol oleyl ether.

Polyethylene glycol nonylphenyl ether, polyethele 7 glycol polypropylene glycol ether, 2,4,7.9-tetramethyl-5-decyl-4,
nonionic surfactants such as ethylene oxide adducts of 7-thiol;

1 () Naphthalene sulfo/acid formalin condensate.

Anionic thread surfactants such as dialkyl sulfosuccinate ester salts.

2 Preservatives 1] Potassium rubinoate, 11) Sodium benzoate A
, 1it) Benotachlorophenol f IJ Ram.

lv) Sodium dehydroate, etc.

8. pH adjuster 1) Sodium hydroxide, 11) Sodium carbonate.

1st) Triethanol, etc.

4. Rust inhibitor 1) Benozotriazole, 11) Tolyltriazole,
1ll) dicyclohexyl ammonium nitrate, etc.

As the aqueous medium component, polyhydric alcohols and glycol ethers are more preferred.

The amount of aqueous medium components such as alcohol and glycol ether in each of the above components is preferably such that it accounts for 5 to 40% by weight of the ink composition.

When this ratio exceeds 40 mjit%, the viscosity increases and there is a tendency to cause smearing during writing, while when it is less than 5%, the storage stability and cap-off properties of the ink composition decrease.

The ink composition of the present invention containing xanthan gum as an essential component is not limited to the above composition, and compositions containing components other than the above are also included within the scope of the present invention.

The ink composition of the present invention is produced, for example, as follows. The xanthan agent and other additives are added to the water being stirred at room temperature and are dispersed uniformly.

The ink composition of the present invention has excellent storage stability and exhibits appropriate viscosity and fluidity over a long period of time.

Therefore, as shown in FIG. 1, the ink composition has a ballpoint pen body including a backflow prevention part (3), an ink conductor (5), a pen tip part (7), and a ball (9), and an intermediate hollow part 0. ]
) is extremely useful as an ink for a so-called 1-ink-free'' type water-based ballpoint pen having an ink storage section.

Examples 1 to 9 and Comparative Examples 1 to 2 Ink compositions were prepared using the raw materials shown in Tables 1 and 2. In Tables 1 and 2, "=" indicates that the number 1 minus the left is the same.

Table 1 Table 2 In Tables 1 and 2, the meanings of notes are as follows.

I) Trade name: "KELSAN", manufactured by Sansho ■.

2) Trade name “Eosin”, manufactured by Odogaya Chemical Industry ■.

3) Trade name: “Acid 'Phloxine PB', manufactured by Hodogaya Chemical Industry ■.

4) Trade name: 6 Tartrazine, manufactured by Odugaya Chemical Industry ■.

5) Measured using an ELD type viscometer.

6) Trade name: 6 Water Bruna 9″, manufactured by Orient Chemical Industry ■.

7) Trade name: 6 Water Black +00-L', manufactured by Orient Chemical Industry ■.

Next, each of the inks obtained above was placed in a ballpoint pen of the type shown in FIG. 1, and various tests were conducted. Result is,
As shown in Table 8. The specifications of the ballpoint pen used are as follows.

Ball (9): Steel ball with a diameter of 0.4 mm.

Bent tip (7): Made of polyacecool, 1.5 m in diameter
m, and has an ink outlet hole with a length of 7 mm.

Ink conductor (5): Polyester fiber bundle processed with resin, diameter 8 mm, length 5 nm, porosity 6
It is 3%.

Ink tank (Ill...Made of voriglopyrene, inner diameter 8
mfn.

The length of the tank part is 80 mm.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a water-based ballpoint pen using the ink composition of the present invention. (1) Ballpoint pen body, (3) Backflow prevention part,
(5) Ink conductor, (7) Be/Tip part, (9
)...Ball, 01)...Ink storage section. (Above) Figure 1 J 11 1 ') / Procedural amendment (Rin) Director of the Patent Office Kazuo Wakasugi 1 Indication of tenancy 1981 Patent Application No. 185683 2 Issue 1! IJ (7) Name Aqueous Po1. 1. f Composition 3: Those who make corrections and sharecropping. Relationship: Special 1m person Sakura Crevasse Co., Ltd. 4, Agent: Heiwa Building, 2-10, Hirano-cho, Higashi-ku, Osaka Telephone: 06-203
-0941 (A(:) 8, Contents of the amendment As attached to the attached sheet, Contents of the amendment 1. In the first line from the bottom of page 6 of the specification, the phrase [Sial + Rusulfo] succinic acid ester sodium salt" has been replaced with 1.; Al 2. Specification, page 12, line 12 ['Water Black +
00-L” is replaced with “Water black too-”
L" (dye solid content, approximately 20@rat%)" is corrected. 3. Add the following statement to the last line of page 14 of the description letter 4, page 1, line 1 of the explanation of surface vehicle power. [Examples 10 to 12 Ingredient compositions were prepared using the raw materials shown in Table 4. In Table 4, "→" indicates "same as on the left". Table 4 1) to 5) ■ Same as U. 8) In Example 1O, the trade name “Neocol 7) u(No.-
(manufactured by Kogyo Pharmaceutical Flavor), and in Example 11, the brand name “Maggot Sole”
(manufactured by Nippon Oil & Oil Co., Ltd.), and in Example 12, the trade name "Rivar SA°' (manufactured by Lion Oil Company Ltd.) was used, respectively. When the tests shown in Table 3 above were conducted on each of the Ishi+ obtained in Examples 1O to 12, all of the results were ○ in terms of +Yap-off property, In-10 run-off property, shorthand property, and In-1000 scum. . Furthermore, when the drying properties of handwriting (-measuring the time until it is dry to the touch after writing the letter "V" on F-quality paper) using the ball pencil, it was found that in Example 10, it was 35 seconds, In Example +1, the time was 20 seconds, and in Example 12, it was 15 seconds.
and) The drying time was 80 seconds or more when 62.6% by weight of water was removed without using the sorter salt. ” Bakuhishu bone fight temple Toyanagi mo (more than that) = 53

Claims (1)

[Claims] (D) An aqueous ballpoint pen ink composition containing 0.20 to 45% by weight of xanthan gum.