Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
1999-07-26
2001-11-06
Koslow, C. Melissa (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S001150, C106S031720
Reexamination Certificate
active
06312510
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a water based white color tone pigment ink for a ballpoint pen which uses titanium oxide and a complementary colorant for a colorant and can provide drawn lines having a strong color developing property such as a white color and a poster color regardless of a color tone of writing paper and in which the lines printed by means of a writing instrument, a type writer and a copying machine can be covered or corrected, more specifically to a water based white color tone pigment ink for a ballpoint pen which inhibits titanium oxide from settling even in long term storage and which has a good follow-up property and can write continuously.
BACKGROUND ART
An ink having a viscosity of 10 to some 100 centipoises described in Japanese Patent Laid-Open No. Hei 4-258677 has so far been reported as a water based ink using as a colorant titanium oxide, which is a white pigment. However, since this ink does not inhibit titanium oxide from settling, it has to be stirred again in use and has had the inconvenience that a ball for stirring has to be put in a tank for storing.
In contrast with the ink described above, as a water based white color pigment ink for a ballpoint pen which does not settle titanium oxide, an ink comprising a white pigment, tabular silicate and a water soluble resin and having a viscosity of 6,000 to 100,000 centipoises is reported in Japanese Patent Laid-Open No. Hei 6-287499. However, this ink has the problem that it has a high viscosity and is inferior in a follow-up property in writing.
Further, reported in Japanese Patent Laid-Open No. Hei 7-216283 is an ink comprising a white pigment and a nonionic surfactant having an HLB of 17.0 or more and having a viscosity of 6,000 to 50,000 centipoises. This ink also does not solve the problem that the follow-up property in writing is not good because of a high viscosity value.
Further, reported in Japanese Patent Laid-Open No. Hei 8-12916 is an ink comprising titanium oxide, a thickening water-soluble resin and a sugar alcohol and having a viscosity of 6,000 to 50,000 centipoises and a viscosity index of 2 or more which is obtained from a revolution difference of a viscometer. However, even if this viscosity index is met, the inferior follow-up property of the ink in writing quickly and splitting of the drawn lines are not solved. In addition thereto, only a white pigment is added as a coloring material, so that the ink has the problem that the marking performance is inferior on writing paper having a white ground.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a water based white color tone pigment ink for a ballpoint pen which uses titanium oxide and a complementary colorant as a colorant and is improved in water resistance and weatherability by using a resin emulsion, which can provide vivid drawn lines having a good poster color tone even on writing paper having a dark color, which is inhibited from settling/separating titanium oxide and from deteriorating in quality even in long term storage and which has a good follow-up property and can write continuously.
The present invention relates to a water based white color tone pigment ink for a ballpoint pen which comprises titanium oxide and a complementary colorant, a resin emulsion, a thickener for preventing settling and separating, a polar solvent, water and other controlling agents required of a water based ink for a ballpoint pen and which provides drawn lines with covering ability and presents various colors of a poster color tone.
BEST MODE FOR CARRYING OUT THE INVENTION
The embodiment of the present invention shall be explained below in detail.
Titanium oxide used in the present invention is used as a white pigment for providing the drawn lines with a covering ability. The kind of titanium oxide includes two kinds of a rutile type and an anatase type depending on a difference in the crystalline structure, and both can be used in the present invention.
Commercial products include Tipaque R-550, Tipaque R-580 and Tipaque R-780 (manufactured by Ishihara Sangyo Kaisha, Ltd.), Titanix JR-300, Titanix JR-701, Titanix JR-801 and Titanix JR-805 (manufactured by Tayca Corporation), and Tipure R-706, Tipure R-900 and Tipure R-960 (manufactured by Du Pont Co., Ltd.). The use amount thereof is preferably 10 to 40% by weight based on the whole amount of the water based ink. Two or more kinds of titanium oxide products can be used in a mixture.
Used as the complementary colorant for toning a color other than a white color, which is a ground color of a titanium oxide particle, is a pigment having an average particle diameter of 100 nm or more or a pseudo pigment obtained by dyeing water-insoluble polymer fine particles having an average particle diameter of 200 nm or more with a dye. A pigment itself is excellent in water resistance and weatherability and provides semi-permanent drawn lines, and when it is present together with a resin emulsion, the drawn lines can be a rainbow color which shows various color tones regardless of intensity and a color tone of the ground color of writing paper.
Examples of the pigments to be used include inorganic pigments such as carbon black, titanium black, zinc oxide, iron oxide red, chromium oxide, 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, and organic pigments such as 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. Pigment Yellow 34, C. I. Pigment Yellow 55, C. I. Pigment Yellow 74, C. I. Pigment Yellow 83, C. I. Pigment Yellow 95, C. I. Pigment Yellow 166, C. I. Pigment Yellow 167, C. I. Pigment Orange 5, C. I. Pigment Orange 13, C. I. Pigment Orange 16, C. I. Pigment Violet 1, C. I. Pigment Violet 3, C. I. Pigment Violet 19, C. I. Pigment Violet 23, C. I. Pigment Violet 50, and C. I. Pigment Green 7. They are used alone or in combination of plural kinds thereof.
The pseudo pigment obtained by dyeing polymer fine particles with a dye is obtained by dyeing a resin comprising spherical fine particles having a small specific surface area and is characterized by that it has small surface adsorptivity and small coagulation action with titanium oxide and that adsorption-coagulation action between the particles is small. If it has a large particle diameter, a vivid color is developed even on writing paper having a dark hue. In particular, if it has an average particle diameter of 200 nm or more, not only the color development described above but also inhibition of settling of titanium oxide becomes possible, and therefore it is more preferred.
The thickener is used for inhibiting titanium oxide from setting and for providing an ink for a ballpoint pen with a suitable fluidity, and the thickeners have to be selected from ones having a property that they are not reduced in the effect when used in combination with titanium oxide, a resin emulsion and a complementary colorant in a water based ink.
To be specific, there can be used, natural polysaccharides which include seed polysaccharides such as guar gum, locust bean gum, galactomannan, pectin and derivatives thereof, psyllium seed gum and tamarind gum; microbial gums such as xanthane gum, rheozan gum, rhamsan gum, welan gum and gellan gum; sea weed polysaccharides such as carrageenan, alginic acid and derivatives thereof; resin polysaccharides such as tragacanth gum
Kamagata Tadashi
Miyamoto Masaru
Shinozuka Miki
Darby & Darby
Faison Veronica F.
Koslow C. Melissa
Mitsubishi Pencil Kabushiki Kaisha
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