JPS62253678A - Marking ink composition - Google Patents

Abstract

PURPOSE:To provide the titled composition composed of a colorant, an organic solvent, a resin, a trimethylolalkane-fatty acid ester derivative and a polyglycerol fatty acid ester, having high resistance to drying at the tip of pen, writable to a plastic sheet, etc., and erasable by rubbing. CONSTITUTION:The objective composition is at least composed of (A) a colorant (e.g. pigment), (B) an organic solvent (e.g. ethanol), (C) a resin soluble in said solvent B (e.g. rosin), (D) a trimethylolalkane-fatty acid ester derivative of formula I (R1 is 1-3C alkyl; R2 and R3 are H or 1-21C alkyl; R4 is 3-21C alkyl) (e.g. trimethylolpropane caprylic acid triester) and (E) a polyglycerol fatty acid ester of formula II (R is acyl or H; n is 0 or positive integer) (e.g. diglyceryl monooleate).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention has excellent pen tip drying resistance. Plastic plate/
A marking ink composition that can be written on non-absorbent surfaces such as metal plates, enamel plates, and glass plates, and that can be easily erased by lightly rubbing the handwriting with a dry cloth, flexible paper, etc. It is about things.

(Prior Art) Marking ink compositions that can be written on non-absorbent surfaces and whose handwriting can be easily erased by rubbing are known. The marking ink composition dries quickly when written on a non-absorbent surface to provide clear and sharp handwriting.

Usually, it consists of a relatively low boiling point organic solvent, a colorant, a resin, and a release agent. Therefore, when the marking ink composition is used in a writing instrument, it is best to leave it with the cap removed.

Disadvantages include that the organic solvent evaporates from the ink composition at the nib, and the coloring material and resin precipitate, clogging the surface and inside of the nib, obstructing the ejection of ink from the nib, and making handwriting blurry or impossible to write. have. Therefore, in order to suppress the evaporation of the solvent from the pen tip and improve the drying resistance of the pen tip,
As a pen nib drying resistance improver, JP-A-58-79067
Alkydamide alcohol in the publication.

Sorbitan fatty acid ester has a % open M6o-84569
, +3 publication discloses sucrose ester.

(Problems to be Solved by the Invention) However, the pen nib drying resistance improver disclosed in the above publication requires a large amount to obtain practical pen nib drying resistance, and in this case, the formation of a resin film There were problems in that the clarity of the handwriting was reduced, such as the performance being inhibited and the handwriting turning white.

Therefore, it is an object of the present invention to provide a marking ink composition using a highly effective pen nib desiccation resistant agent that can provide practical pen nib drying resistance by adding a small amount.

(Means for solving the problem) A coloring material, an organic solvent, a resin soluble in the organic solvent, a trimethylolalkane-fatty acid ester derivative represented by the following general formula (1), and the following general formula ( 2) A marking ink composition comprising at least a polyglycerol fatty acid ester represented by 2).

<General formula> CH OCORt R+ CCHx 0CORs
・・・・・・・・・(1) CH! OCOR
4 General Formula> The following is a detailed explanation of the present invention.

In the present invention, 1 coloring material refers to pigments, resin-processed pigments, and dyes that do not dissolve in the following organic solvents.

As the pigment, conventionally known organic pigments, inorganic pigments, and metal powder pigments can be used as appropriate, but those that can be stably dispersed as fine particles in the ink composition are preferred.

In this sense, a resin-processed pigment in which a pigment is kneaded into a resin is preferably used, and furthermore, in this case, it is also preferably used because there is no need to incorporate a resin into the ink composition. As the dye, dyes insoluble in organic solvents such as didisperse dyes and vat dyes can be used. The amount of this colorant used varies depending on the type of colorant and other ink components, but is preferably 1 to 20% by weight based on the total amount of ink.
~17% by weight.

Organic solvents include ethanol and propatool.

Lower alcohols such as isopropanol and butanol, lower aliphatic ketones exclusively for methyl ethyl ketone and methyl isobutyl ketone, lower alcohol esters of lower fatty acids such as ethyl acetate and butyl acetate, aromatic hydrocarbons and alicyclics such as benzene, toluene, and xylene. Examples include group alcohols and alkyl ethers of gryfur, which can be used alone or in combination, and the amount used is 55 to 93% by weight, preferably 70 to 9%, based on the total amount of the ink.
It is 0% by weight.

The resin is used to impart film-forming ability, impart adhesion to the coated surface, and adjust the viscosity of the ink. Conventionally used natural resins and synthetic resins can be used, specifically rosin, rosin ester, etc. , rosin-based resins such as rosin-modified glycerin ester, rosin-modified maleic acid resin, rosin-modified phenol resin, rosin-modified phenol glycerin ester, cellulose 4141] W, petroleum-based F14 fat ketone resin, polyvinyl butyral, chloride Examples include vinyl-vinyl acetate copolymer, vinylidene chloride-vinyl chloride copolymer, etc., and the amount used is 0.5 to 15% based on the total amount of ink.
% by weight, preferably 2-10% by weight.

Trimethylolalkane represented by the general formula (1)
Fatty acid derivatives give handwriting a tacky character that can be easily erased by rubbing. Trimethylolpropane-mixed fatty acid triester of lauric acid and stearic acid, trimethylolpropane-caprylic acid triester, trimethylolpropane-lauric acid triester, trimethylolpropane-lauric acid triester, and trimethylolpropane-lauric acid triester. 1 to 25% by weight, preferably 3 to 15% by weight of caprylic triester may be used.

The polyglycerin fatty acid ester represented by the general formula (2), which is the gist of the present invention, is used to improve the drying resistance of the pen tip.Specific examples include diglyceryl monooleate, diglyceryl monooleate, Monostearate, diglyceryl dioleate, decaglyceryl heptaoleate.

These include decaglyceryl decaoleate, decaglyceryl pentastearate, decaglyceryl heptastearate, and decaglyceryl decastearate, among which decaglyceryl pentastearate and decaglyceryl heptastearate are preferably used. The amount used is 0.05 to 5% by weight, preferably 0.15 to 3% by weight based on the total amount of ink.

In addition to the above ingredients, preservatives may be added if necessary.

Antifungal agent, wetting agent, viscosity modifier, antifreeze agent.

Various additives such as antifoaming agents and surfactants can be used as appropriate.

Furthermore, the marking ink composition of the present invention can be easily obtained by mixing and dispersing the above-mentioned components using a dispersing machine such as a homomixer, a ball mill, or a Lage mixer.

(Function) The polyglycerin fatty acid ester represented by the general formula (1) used in the present invention is uniformly dispersed in the ink in a colloidal form, and when the organic solvent in the ink composition evaporates at the pen tip, the resin At the same time, it precipitates and forms a very brittle film on the surface of the pen tip. This film suppresses evaporation of the organic solvent and is easily destroyed by normal writing pressure, so it is thought that the drying resistance of the pen tip is improved. Moreover, this polyglycerin fatty acid ester is @
Compared to the other pen nib drying resistance improvers mentioned above, when dispersed in a colloidal form in a solvent, the volume becomes larger, so even if the amount added is small, it sufficiently forms a very brittle film on the surface of the nib. This property is believed to be helpful in producing the effect.

(Example) The present invention will be explained in more detail according to an example below.
In the examples, "parts" indicate [parts by weight].

Examples 1 to 3 shown in Table 1 below. Each component of Comparative Examples 1 to 5 was mixed and dispersed using a homomixer to obtain a marking ink composition.

Table 1 Supplementary explanation for Table 1> (1) Fuji AS Black: Fuji Color (manufactured by M, processed pigment; pigment; carbon black (45 wt%); resin; holvinyl petitral (55 wt%))> (2) 7 AS Red: manufactured by Fuji Shiki ■, processed pigment; insoluble azo pigment (5
Dwt%), Resin; Bolivinyl Ptylar lv, (50w
t%)〉(5) 7di IK Blue: manufactured by Fuji Shiki ■, processed pigment Mixed fatty acid triester of monoacid (5) NGELP TPO: manufactured by Shin Nippon Rika, trimethylolpropane-caprylic acid triester (6)
Dekagrinri-8 Made by Nikko Kumicals ■.

Decaglyceryl Pentastearate (7) Deka Glycif-8 Manufactured by Nikko Chemicals ■.

Decaglyceryl heptastearate (8) Softer-1000: manufactured by NOF ■, alkylamide alcohol (9) Nonionic PP-40R: manufactured by NOF ■, sorbitan palmitate (effects of the invention) As described above, Examples 1 to 3. Table 2 shows the results of a pen nib drying resistance test using the marking ink compositions obtained in Comparative Examples 1 to 3.

Table 2: Pen nib drying resistance test> (Note) Test method: Fill a writing instrument with a fiber core and batting with each marking ink composition, remove the cap, and store it indoors at a temperature of 20°C. After being left in a room with a humidity of 50%, writing was done every 30 minutes for 1 hour, and then every hour after 1 hour had passed, and the time until the handwriting became blurry was measured.

As described above, the marking ink composition of the present invention has excellent pen tip drying resistance when used in writing instruments.

Claims (1)

[Scope of Claims] A coloring material, an organic solvent, a resin soluble in the organic solvent, a trimethylolalkane-fatty acid ester derivative represented by the following general formula (1), and a trimethylolalkane-fatty acid ester derivative represented by the following general formula (2). A marking ink composition comprising at least a polyglycerol fatty acid ester. <General formula> ▲There are mathematical formulas, chemical formulas, tables, etc.▼…………(1) (R_1 is an alkyl group with 1 to 3 carbon atoms, R_2 to R_3
represents hydrogen or an alkyl group having 1 to 21 carbon atoms, R_4 represents an alkyl group having 3 to 21 carbon atoms, and R_2 to R_4 may be the same or different. ) <General formula> ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(2) (In the formula, R represents an acyl group or hydrogen, and n represents 0 or a positive integer.)