Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2002-12-02
2004-08-17
Bell, Mark L. (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S031590, C106S031860, C106S031890, C106S031020, C106S031430, C106S031750
Reexamination Certificate
active
06776829
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a water based ink composition for a writing instrument characterized by shedding fragrance in writing and imparting faint fragrance as well to the drawn lines.
BACKGROUND ART
In general, a perfume is oil-soluble, and an emulsifier or a dispersant which forms a protective colloid is required in order to emulsify and disperse it in water. Water-soluble resins or surfactants are used as the protective colloid described above, and in the case of almost all water-soluble resins, use of a necessary and sufficient amount of a resin required for dispersing a perfume raises the liquid viscosity and makes it inadequate as an ink for a writing instrument.
On the other hand, an emulsion which is prepared using a surfactant in an amount sufficient for emulsifying a perfume in a stable state is reduced in the surface tension to a large extent, so that an ink prepared using the emulsion has a practical problem that the drawn lines are liable to cause feathering. Further an ink prepared by the mere emulsifying and dispersing of a perfume by the method described above provides the problem that fragrance is shed immediately after writing but the fragrance is lost soon thereafter and can not be maintained for a long time (no durability).
Those which have so far been known as ink compositions for a writing instrument containing a perfume shedding fragrance in writing include, for example, inks for a ballpoint pen comprising dyes, resins and organic solvents, wherein a perfume having a compatibility with the above ink is added (Japanese Patent Application Laid-Open No. 81377/1981), perfume-containing, water based inks which are blended with a perfume, maltosylcyclodextorin (MCD), a colorant and water (Japanese Patent Application Laid-Open No. 223078/1988) and water based ink compositions for a writing instrument which comprise a colorant, a perfume, a partially sulfonated polyester resin and water (Japanese Patent Application Laid-Open No. 283645/1996).
However, the ink composition described in Japanese Patent Application Laid-Open No. 81377/1981 described above has a problem that feathering is caused on a paper surface in writing even if a perfume having a compatibility with the ink is added. Further, in the ink composition described in Japanese Patent Application Laid-Open No. 223078/1988 described above, the perfume is included in MCD, and the above inclusion compound is added to the water based ink. Accordingly, the perfume contained in this water based ink tends to easily be separated with the passage of time, particularly with the passage of time at a high temperature, so that the ink composition involves problems in dispersibility of the perfume and durability of fragrance. Further, the ink composition disclosed in Japanese Patent Application Laid-Open No. 283645/1996 involves the problem that fragrance is shed immediately after writing but the fragrance is lost thereafter and can not be retained for long time (no durability).
In light of the problems on the conventional techniques described above, the present invention intends to solve them, and an object thereof is to provide a water based ink composition for a writing instrument which is less liable to cause feathering of the lines and has durability of fragrance and in which a perfume is dispersed and retained in an aqueous medium in a stable state.
DISCLOSURE OF THE INVENTION
Intensive researches conducted by the present inventors regarding the problems of the conventional techniques described above have resulted in successfully obtaining a water based ink composition for a writing instrument which meets the object described above by adding a specific ink component to a water based ink composition for a writing instrument comprising a colorant and a perfume, and thus the present invention has been completed.
That is, the water based ink composition for a writing instrument of the present invention is characterized by comprising a colorant, a perfume and water in combination with at least one specific nonionic surfactant.
Used as the nonionic surfactant is at least one selected from polyhydric alcohol type nonionic surfactants, polyethylene glycol type nonionic surfactants, castor oil base nonionic surfactants and ethylene oxide adducts of alkylamine and alkylamide.
BEST MODE FOR CARRYING OUT THE INVENTION
The water based ink composition for a writing instrument of the present invention comprises a colorant, a perfume and water in combination with at least one specific nonionic surfactant.
The nonionic surfactant used in the present invention is used for the purposes of a feathering inhibitor, a fragrance durability-improving agent and inhibiting separation of the perfume and includes the following ones.
(1) Polyhydric alcohol type nonionic surfactants:
polyhydric alcohol fatty acid esters
(2) Polyethylene glycol type nonionic surfactants:
ethylene oxide adducts of polyhydric alcohol fatty acid esters, ethylene oxide adducts of higher alcohols and alkylphenols and ethylene oxide and propylene oxide adducts of higher alcohols
(3) Castor oil type nonionic surfactants:
ethylene oxide adducts of castor oil or hardened castor oil and ethylene oxide adducts of hardened castor oil fatty acid esters
(4) Ethylene oxide adducts of alkylamines and alkylamides:
ethylene oxide adducts of higher alkylamines and fatty acid amides.
To be more specific,
(1) used as the polyhydric alcohol type nonionic surfactants are polyhydric alcohol fatty acid esters such as sucrose fatty acid esters, sorbitan fatty acid esters, polyglycerin fatty acid esters and propylene glycol fatty acid esters,
(2) used as the polyethylene glycol type nonionic surfactants are polyoxyethylene adducts of polyhydric alcohol fatty acid esters, such as polyoxyethylene trimethylolpropane fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbit fatty acid esters and polyoxyethylene sorbitan fatty acid esters, ethylene oxide adducts of alkylphenols, higher alcohols, cholesterol, lanolin alcohol and polypropylene glycol, and ethylene oxide and propylene oxide adducts of higher alcohols,
(3) used as the castor oil type nonionic surfactants are ethylene adducts of castor oil or hardened castor oil and fatty acid esters of polyoxyethylene hardened castor oil, and
(4) used as the ethylene oxide adducts of alkylamines and alkylamides are ethylene oxide adducts of higher alkylamines and fatty acid amides.
Next, the foregoing nonionic surfactants used in the present invention shall specifically be explained.
(1) Polyhydric Alcohol Fatty Acid Esters
The sucrose fatty acid ester used in the present invention is obtained by esterifying at least one of 8 hydroxyl groups present in sucrose with a fatty acid, and it is a surfactant in which a sucrose part is a hydrophilic group and in which a fatty acid part is a lipophilic group. The sucrose fatty acid ester can be controlled in a surface tension and an interfacial tension by the number of fatty acids bonded to sucrose or a molecular weight of fatty acids bonded thereto, and it has excellent solubility, emulsifiability and dispersibility. In the present invention, all publicly known sucrose fatty acid esters can be used as long as the characteristics of the ink composition are not damaged, and they can be blended not only alone but also in combination of two or more different kinds thereof.
Capable of being given as the examples of the preferred commercial products of the sucrose fatty acid esters are DK Ester F-160, F-140, F-110, F-90, F-70 and F-50 manufactured by Daiichi Kogyo Seiyaku Co., Ltd., Sunsoft SE-16P, SE-16, SE-11 and SE-7 manufactured by Taiyo Kagaku Co., Ltd., and Ryoto Sugar Ester S-070, S-170, S-270, S-370, S-570, S-970, S-1570, P-070, P-170, P-1570, M-1695, O-170, O-1570, OWA-1570, L-195, L-595, LWA-1570, B-370, ER-190, ER-290 and POS-135 manufactured by Mitsubishi Kagaku Foods Corporation.
The sorbitan fatty acid ester is a compound-obtained by esterifying a fatty acid with sorbitan which is produced by dehydrating sorbitol with heating, and the specific
Kamagata Tadashi
Miyamoto Masaru
Miyazaki Shigeru
Takeuchi Yoji
Burns Doane Swecker & Mathis L.L.P.
Faison Veronica F.
Mitsubishi Pencil Kabushiki Kaisha
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