JP2970782B2 - Ink composition for ethanolic metallic color - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a marking pen, a brush,
The present invention relates to a metallic color ink composition which is applied to a seal or the like to give a metallic glossy color tone.

[0002]

2. Description of the Related Art Metallic oil-based inks in which a metal powder such as aluminum is dispersed in a vehicle based on an organic solvent such as xylene are well known. However, since the organic solvent used is a highly irritating solvent such as xylene, there are problems in that the odor and the evaporation of the solvent are harmful and that the writing surface is easily eroded depending on the type of resin plate. On the other hand, water-based inks have been studied as inks that do not have any adverse effects due to the organic solvent, but they are deteriorated with the lapse of time due to the generation of hydrogen gas due to the reaction between metal and water, and water evaporation is particularly slow. When drawing on a non-absorptive writing surface, there is a disadvantage that it takes time until the drawing line is dried and fixed.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems with respect to the conventional metallic ink, and has a low unpleasant smell and toxicity, has good writing properties on many writing surfaces, and has good coloring. It is an object of the present invention to provide a metallic color ink composition which does not deteriorate due to generation of gas by reacting with aluminum powder mixed as an agent.

[0004]

As a result of various studies to solve the above-mentioned problems, the present inventor has found that aluminum powder as a coloring agent, ethanol as a main solvent, and an ethanol-soluble rosin-modified maleic resin as a dispersant are used. It has been found that the above objects can be achieved by using the same, and the present invention has been completed.

[0005] The metallic color ink composition of the present invention is characterized by being ethanolic containing aluminum powder, ethanol, and an ethanol-soluble rosin-modified maleic resin.

As the aluminum powder used in the ink composition of the present invention, a commercially available aluminum powder or an easy-to-use aluminum paste type can be used. The average particle size of aluminum is preferably 5 to 15 μm, and if it is 15 μm or more, it will be difficult to pass through a thin tube such as a fiber core used for writing, and if it is 5 μm or less, the glitter of drawn lines will be significantly reduced. When a leafing type is used, the glitter is further improved.
The amount added is not particularly limited and may be an amount suitable for a desired hue and concentration, but is usually 1 to 30% of the composition. The color tone may be changed by adding a dye or a pigment as another colorant.

[0007] Ethanol used in the ink composition of the present invention is a main component of the solvent, and preferably contains 95% or more of the entire solvent, is low in toxicity, and has an effect on quick drying of the ink. Other solvents are added as an anti-whitening agent, a drying inhibitor for the writing portion, an auxiliary solvent for the dye, or for the purpose of stabilizing the dispersion. Specific examples of the solvent include organic solvents such as benzyl alcohol, propyl alcohol, and ethyl lactate, and water, but the amount of use is significantly smaller than that of ethanol.

The ethanol-soluble rosin-modified maleic resin used in the ink composition of the present invention suppresses a reaction that degrades aluminum or a gas generated by a reaction between ethanol and aluminum, and disperses aluminum powder stably. And those having an acid value of 200 to 400 can be suitably used. If the acid value is small, the dispersibility is poor. If the acid value is too large, the interaction with aluminum is so strong that the stability of the ink is impaired. The addition amount of the resin is preferably 15 parts by weight or more based on 100 parts by weight of aluminum.

The ink composition of the present invention contains, in addition to the essential components of the above aluminum powder, ethanol and ethanol-soluble rosin-modified maleic resin, other resins such as a fixing agent, a ketone resin, and a phenol resin, if necessary. May be added. Specific examples of the fixing agent include Hilac 110H (manufactured by Hitachi Chemical Co., Ltd.), Tamanol PA, and Tamanol 531 (manufactured by Arakawa Chemical Industries).

In the ink composition of the present invention, when a dispersant other than the ethanol-soluble rosin-modified maleic resin is used, it is difficult to disperse ethanol as a main solvent due to an intermediate structure between an oily solvent and water. At the same time, the problem of deterioration over time occurs due to the interaction between aluminum and ethanol or between aluminum and a dispersant. However, the addition of the ethanol-soluble rosin-modified maleic acid resin used in the present invention makes it possible to stably disperse aluminum without causing deterioration of the ink over time due to the interaction between the aluminum and the resin, and the required ink performance. Can be supplied stably.

[0011]

EXAMPLES The composition of the present invention will be described with reference to Examples and Comparative Examples. The performance of the metallic color inks obtained in Examples and Comparative Examples was evaluated by the following methods. Odor: Comparing and evaluating the odor when using ink as a pen and using it. Writability: Visually observe the drawing after drying completely. Drying property: The ink was prepared into a writing instrument, and the time taken to dry the written lines was compared (25 ° C., 65%). Dispersibility: Observe the initial dispersion of the ink. Dispersion stability: Observation of sedimentation state of aluminum etc. after leaving the ink for a long time (room temperature). Ink aging deterioration: The degree of deterioration such as generation of gas and change in hue when the ink was left in a 50 ° C constant temperature bath was evaluated. Each performance was indicated by ◎ for particularly good, ○ for good, Δ for slightly poor, and x for poor.

(Example 1) Aluminum paste 15.0 (parts) (Al powder content 65%, average particle size 10 μm) Alcohol-soluble rosin-modified maleic resin 17.0 (Arakawa Chemical Industries, Ltd.): Marked 33) Ethanol 68.0 The above composition was mixed and dispersed with a stirring mixer for 60 minutes to prepare a silver ethanolic metallic color ink. Table 1 shows the results of the performance evaluation.

(Example 2) Aluminum paste (same as Example 1) 15.0 (parts) Oil blue # 613 (trade name: manufactured by Orient Chemical Industries) 1.5 Alcohol-soluble rosin-modified maleic resin 5 3.0 (manufactured by Arakawa Chemical Industries, Ltd .: Marquid 34) Ketone resin 13.0 (manufactured by Hitachi Chemical Co., Ltd .: Hilac 110H) Ethanol 62.0 Benzyl alcohol 3.5 The above composition was used in Example 1. In the same manner as in the above, a blue ethanolic metallic color ink was prepared. Table 1 shows the results of the performance evaluation.

[0014]

[Table 1] ◎ indicates particularly good, は indicates good, △ indicates slightly poor, and × indicates poor.

(Comparative Example 1) Aluminum paste (same as in Example 1) 16.0 (parts) Coumarone resin 20.0 (manufactured by Nittetsu Chemical Industry Co., Ltd .: Nippon Steel Coumalon G-90) Aliphatic Amide 0.1 xylene 50.0 methyl isobutyl ketone 14.0 The same composition as in Example 1 was used to prepare a metallic color ink. Table 1 shows the performance evaluation.

(Comparative Example 2) Aluminum paste (same as in Example 1) 15.0 (parts) Acrylic emulsion 20.0 Polyvinyl alcohol 0.5 Ethylene glycol 3.0 Water 61.5 Table 1 shows the results in the same manner as in Comparative Example 1.

Comparative Example 3 Aluminum paste (same as in Example 1) 15.0 (parts) Styrene / maleic acid resin 17.0 (Sekisui Plastics: SME50,000) Ethanol 68.0 Table 1 shows the results in the same manner as in Comparative Example 1.

[0018]

The ethanol ink composition for metallic colors of the present invention is characterized in that it contains aluminum powder as a coloring agent, ethanol as a main solvent, and an ethanol-soluble rosin-modified maleic resin as a dispersing agent. Therefore, the metallic color ink of the composition of the present invention has a low unpleasant odor and toxicity, has good writing properties on many writing surfaces, and generates gas even when ethanol which is reactive with aluminum or the like is used. No degradation occurs.

Claims (1)

(57) [Claims] 1. An ethanol-based metallic color ink composition comprising aluminum powder, ethanol, and an ethanol-soluble rosin-modified maleic resin.