Oil-based ink composition for ballpoint pens and ballpoint pen employing the same
AssigneeKabushiki Kaisha Pilot Corporation
InventorsTakahito Miyake, Chinatsu Shinozaki
Life of this patent
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Abstract
[Problem] To provide an oil-based ink composition for ballpoint pens and also an oil-based ballpoint pen employing the composition. The ink composition inhibits a ball seat from wearing under high pen pressure (writing load: 300 to 500 gf), improves writing feeling, and is excellent in writing performance at the beginning of handwriting, in temporal stability and in ink followability. [means to solve the problem] An oil-based ink composition for ballpoint pens, comprising a colorant, an organic solvent, and a polyoxy-alkylene glyceryl ether.
Claims15
An oil-based ink composition for ballpoint pens, comprising a colorant, an organic solvent, a resin, a polyoxyalkylene glyceryl ether, and a surfactant,
- wherein the surfactant is at least one selected from the group consisting of a nonionic surfactant having an HLB value of 16 or less and an anionic surfactant,
- the nonionic surfactant having the HLB value of 16 or less is at least one selected from the group consisting of a fatty acid ester, a polyalkylene alkyl ether, a polyoxyethylene alkyl amine, an alkyl imidazoline, and an alkyl alkanol amide,
- the anionic surfactant is a phosphoric ester surfactant having an acid value of 200 mgKOH/g or less,
- the polyoxyalkylene glyceryl ether is a polypropylene glyceryl ether having an average addition molar number of alkylene oxide of 1 to 50,
- a content of the polyoxyalkylene glyceryl ether is 0.1 to 40 mass % based on a total mass of the oil-based ink composition,
- a content of the resin is 5 to 30 mass % based on the total mass of the oil-based ink composition,
- the resin comprises a polyvinyl butyral resin, and
- a blending ratio by mass of the polyoxyalkylene glyceryl ether to the surfactant is 1 to 25.
An oil-based ballpoint pen, comprising:
- an ink storage cylinder and a ballpoint tip, the ballpoint tip fitted in a tip-side end of the ink storage cylinder and rotatably holding a ball,
- wherein the ink storage cylinder comprises an oil-based ink composition comprising a colorant, an organic solvent, a resin, a polyoxyalkylene glyceryl ether, and a surfactant,
- wherein the surfactant is at least one selected from the group consisting of a nonionic surfactant having an HLB value of 16 or less and an anionic surfactant,
- the nonionic surfactant is at least one selected from the group consisting of a fatty acid ester, a polyalkylene alkyl ether, a polyoxyethylene alkyl amine, an alkyl imidazoline, and an alkyl alkanol amide,
- the anionic surfactant is a phosphoric ester surfactant having an acid value of 200 mgKOH/g or less,
- the polyoxyalkylene glyceryl ether is a polypropylene glyceryl ether having an average addition molar number of alkylene oxide of 1 to 50,
- a content of the polyoxyalkylene glyceryl ether is 0.1 to 40 mass % based on a total mass of the oil-based ink composition,
- a content of the resin is 5 to 30 mass % based on the total mass of the oil-based ink composition,
- the resin comprises a polyvinyl butyral resin, and
- a blending ratio by mass of the polyoxyalkylene glyceryl ether to the surfactant is 1 to 25.
Dependencies are inferred from the claim text.