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AssigneeMitsubishi Pencil Company, Limited
InventorsMasaru Miyamoto, Tadashi Kamagata, Yoji Takeuchi, Shigeru Miyazaki
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Provided is a water based ink composition for a writing instrument comprising at least one of nonionic surfactants comprising polyhydric alcohol fatty acid esters, ethylene oxide adducts of polyhydric alcohol fatty acid esters, ethylene oxide adducts of higher alcohols and alkylphenols, ethylene oxide and propylene oxide adducts of higher alcohols, ethylene oxide adducts of castor oil or hardened castor oil, ethylene oxide adducts of hardened castor oil fatty acid esters and ethylene oxide adducts of higher alkylamines and fatty acid amides and further comprising a colorant, a perfume and water. It is less liable to cause feathering of the lines and has durability of fragrance, in which a perfume is dispersed and retained in an aqueous medium in a stable state.
A water based ink composition for a writing instrument comprising at least one of nonionic surfactants comprising polyhydric alcohol fatty acid esters, ethylene oxide adducts of polyhydric alcohol fatty acid esters, ethylene oxide adducts of higher alcohols, ethylene oxide adducts of alkylphenols, ethylene oxide and propylene oxide adducts of higher alcohols, ethylene oxide adducts of castor oil or hardened castor oil, ethylene oxide adducts of hardened castor oil fatty acid esters and ethylene oxide adducts of higher alkylamines and ethylene oxide adducts of fatty acid amides and further comprising a colorant, a perfume and water.
Dependencies are inferred from the claim text.
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Inks: writing inks
Writing inks: specially adapted for ball-point writing instruments
Coating compositions
Term end not estimated
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.
In general, a perfume is oil-soluble, and an emulsifier or a dispersant which is 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, if used is a necessary and enough amount of a resin required for dispersing a perfume, the liquid is increased in a viscosity and short of an aptitude as 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 a practical problem that the drawn lines are liable to cause feathering. Further an ink prepared 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 long time (no durability).
The present invention shall be explained below in detail with reference to examples and comparative examples, but it is a matter of course that the present invention shall not be restricted to the examples described below.
The water based ink compositions obtained in the respective examples and comparative examples were evaluated for feathering of the ink, fragrance, separation of the perfume, coagulation of the pigment and writing feeling by the following evaluation methods. Ballpoint pens for evaluation were prepared to evaluate feathering of the ink, fragrance and writing feeling.
Preparation of Ballpoint Pens for Evaluation: