Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2001-05-30
2003-08-12
Klemanski, Helene (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S031020, C106S031750
Reexamination Certificate
active
06605143
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a water based ink composition for a writing instrument which sheds fragrance in writing and which imparts faint fragrance as well to drawn lines.
2. Description of the Related Art
In general, perfumes are oil-soluble, and an emulsifier or a dispersant which forms protective colloid is required in order to emulsify or disperse them in water. Water-soluble resins or surfactants are used as the protective colloid described above. In almost all water-soluble resins, however, use of a necessary and sufficient amount of a resin required for dispersing a perfume raises a viscosity of the liquid and makes it inadequate for an ink for a writing instrument.
On the other hand, an emulsion which is prepared using a surfactant in an amount enough 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 the practical problem that drawn lines are liable to cause feathering. Further, an ink prepared merely emulsifying and dispersing a perfume by the method described above involves the problem that fragrance is shed immediately after writing but the fragrance is lost soon thereafter and can not be retained for 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 ball point pen comprising dyes, resins and organic solvents, wherein a perfume having a compatibility with the above inks is added (Japanese Patent Application Laid-Open No. Sho 56-81377), perfume-containing water based inks blended with a perfume, maltosyl cyclodextrin (MCD), a colorant and water (Japanese Patent Application Laid-Open No. Sho 63-223078) and water based ink compositions for a writing instrument comprising a colorant, a perfume, a partially sulfonated polyester resin and water (Japanese Patent Application Laid-Open No. Hei 8-283645).
However, the ink composition disclosed in Japanese Patent Application Laid-Open No. Sho 56-81377 involves the problem that even if adding a perfume having compatibility, feathering is caused on a paper surface in writing. Also, the ink composition disclosed in Japanese Patent Application Laid-Open No. Sho 63-223078 is prepared by including a perfume in MCD and adding the above inclusion compound to a water based ink, and therefore 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. Hei 8-283645 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).
The present invention intends to solve the problems of the conventional techniques described above, and an object thereof is to provide a water based ink composition for a writing instrument which is less liable to cause feathering and has durability of fragrance and in which a perfume is dispersed and retained in an aqueous medium in a stable state.
SUMMARY OF THE INVENTION
Intensive researches repeated 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 contains an N-acylglutamic acid ester and further contains a colorant, a perfume and water.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The embodiment of the present invention shall be explained below in detail.
The water based ink composition for a writing instrument of the present invention contains an N-acylglutamic acid ester and further contains a colorant, a perfume and water.
The N-acylglutamic acid ester which is 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.
The above-mentioned N-acylglutamic acid ester can be obtained by acylating glutamic acid, which is an acidic amino acid, with a natural higher fatty acid and then esterifying the acylated product with a higher alcohol. The N-acylglutamic acid ester has an excellent solubility, emulsifiability and dispersability. In the presnt invention, all publicly-known N-acylglutamic acid esters can be used as long as they do not damage the characteristics of the ink composition of the present invention, and it is possible to use one kind thereof or in combination of two different kinds or more thereof.
Examples of the preferably commercially available N-acylglutamic acid esters include luaroylglutamic acid dioctyldodecyl ester “LG-OD”, stearoylglutamic acid dioctyldodecyl ester “SG-OD”, lauroylglutamic acid POE(2) octyldodecylether diester “LGOD-2”, lauroylglutamic acid POE(5) octyldodecylether diester “LGOD-5”, lauroylglutamic acid POE(2) stearylether diester “LGS-2” and lauroylglutamic acid POE(5) stearylether diester “LGS-5”, all of which are manufactured by Nihon Emulsion Co., Ltd.
In the present invention, a mixture of at least one of the respective N-acylglutamic acid esters described above has a content of 0.01 to 10% by weight, preferably 0.5 to 5% by weight based on the total amount of the ink composition.
If a content of the N-acylglutamic acid ester is less than 0.01% by weight based on the total amount of the ink composition, the feathering-inhibiting effect, the fragrance durability-improving effect and the perfume separation-inhibiting effect are inferior, and the effects of the present invention can not be displayed. On the other hand, if the content exceeds 10% by weight, the ink is less liable to be dried when transferred onto a paper face, and when it is used for a ball point pen, a discharge amount of the ink from the pen tip is reduced. Accordingly, the such contents are not preferred.
The colorant used in the present invention includes, for example, pigments and water soluble dyes.
The pigment shall not specifically be restricted and includes at least one selected from inorganic and organic pigments, titanium oxide and pseudo pigments obtained by coloring resin emulsions with dyes, all of which are conventionally used for a water based ink.
The inorganic pigments include, for example, carbon black, metal powder and the like.
The organic pigments include, for example, azo lakes, insoluble azo pigments, chelate azo pigments, phthalocyanine pigments, perylene and perinone pigments, anthraquinone pigments, quinacridone pigments, dye lakes, nitro pigments and nitroso pigments.
To be specific, included are inorganic pigments such as carbon black, titanium black, zinc oxide, red iron oxide, chromium oxide, mica titan, black iron oxide, cobalt blue, yellow iron oxide, viridian, zinc sulfide, lithopone, cadmium yellow, vermilion, cadmium red, chrome yellow, molybdate orange, zinc chromate, strontium chromate, white carbon, clay, talc, ultramarine, precipitated barium sulfate, baryte powder, calcium carbonate, white lead, Prussian blue, manganese violet, aluminum powder and bronze powder, C. I. Pigment Blue 1, C. I. Pigment Blue 15, C. I. Pigment Blue 17, C. I. Pigment Blue 27, C. I. Pigment Red 5, C. I. Pigment Red 22, C. I. Pigment Red 38, C. I. Pigment Red 48, C. I. Pigment Red 49, C. I. Pigment Red 53, C. I. Pigment Red 57, C. I. Pigment Red 81, C. I. Pigment Red 104, C. I. Pigment Red 146, C. I. Pigment Red 245, C. I. Pigment Yellow 1, C. I. Pigment Yellow 3, C. I. Pigment Yellow 12, C. I. Pigment Yellow 13, C. I. Pigment Yellow 14, C. I. Pigment Yellow 17, C. I
Miyazaki Shigeru
Takeuchi Yoji
Darby & Darby
Klemanski Helene
Mitsubishi Pencil Kabushiki Kaisha
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