# US 8,771,410 B2 · Ink for ballpoint pens and ballpoint pen using same

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- Number: US 8,771,410 B2
- Document ID: US8771410B2
- Status: Granted
- Kind: B2
- Application number: 13/138,217
- Filed: 2010-01-22
- Published: 2011-11-10
- Granted: 2014-07-08
- Earliest claimed: 2009-01-23
- Assignees: Pentel Kabushiki Kaisha
- Applicants: Aya Otsubo; Ikuo Takagishi; Kiyonori Yasuike; Hiroki Kimura; Takashi Sekine
- Inventors: Aya Otsubo; Ikuo Takagishi; Kiyonori Yasuike; Hiroki Kimura; Takashi Sekine
- Web page: https://patentgrep.com/patent/US8771410B2

## CPC

- C09D 11/18: specially adapted for ball-point writing instruments
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

An ink composition for ballpoint pens comprises a coloring agent, a liquid medium, a polyoxyethylene castor oil and/or a polyoxyethylene hardened castor oil, or a derivative thereof, and one compound or a mixture of two or more compounds selected from the group consisting of a monoalkyl ether phosphoric acid, a polyoxyethylene monoalkyl ether phosphoric acid, a dialkyl ether phosphoric acid, a polyoxyethylene dialkyl ether phosphoric acid, a trialkyl ether phosphoric acid, and a polyoxyethylene trialkyl ether phosphoric acid.

## Claims

### Claim 1

A ballpoint pen ink containing at least a colorant, a liquid medium in which 50% by weight or more of the liquid medium is an organic solvent, polyoxyethylene castor oil, polyoxyethylene hardened castor oil or a derivative thereof represented by the following formula (I), and one kind of a compound or a mixture of two or more kinds of compounds selected from any of the compounds represented by the following formulae (II), (III) and (IV):
(X: an ethylene oxide group, CH2CH2O,
Y: H, CR or COCH2CH2COOH,
R: a fatty acid or hydroxyl group-containing fatty acid having C12 or more,
α+β+γ=an integer of 1 or more,
δ+ε+ξ=an integer of 1 or more), more, and
α+β+γ+δ+ε+ξ<80);
(R: an alkyl group or a phenyl group, and
α: an integer of 0 or more);
(R: an alkyl group or a phenyl group, and
α+β=an integer of 0 or more); and
(R: an alkyl group or a phenyl group, and
α+β+γ=an integer of 0 or more).

### Claim 2 (depends on 1)

A ballpoint pen ink according to claim 1; wherein the value obtained by dividing the weight of the compound of formula (I) in the ink by the combined weight of the compounds of formulae (II), (III) and (IV) is from 0.1 to 100.

### Claim 3 (depends on 2)

A ballpoint pen ink according to claim 2; wherein the value obtained by dividing the weight of the compound of formula (I) in the ink by the combined weight of the compounds of formulae (II), (III) and (IV) is from 0.1 to 20.

### Claim 4 (depends on 1)

A ballpoint pen ink according to claim 1; wherein the organic solvent is an alcohol-based and/or a glycol-based organic solvent.

### Claim 5 (depends on 1)

A ballpoint pen ink according to claim 1; further comprising at least one of a butyral resin, a styrene acrylic resin and a ketone resin.

### Claim 6 (depends on 2)

A ballpoint pen ink according to claim 2; wherein the organic solvent is an alcohol-based and/or a glycol-based organic solvent.

### Claim 7 (depends on 2)

A ballpoint pen ink according to claim 2; further comprising at least one of a butyral resin, a styrene acrylic resin and a ketone resin.

### Claim 8

An ink composition for ballpoint pens, the ink composition comprising:
a coloring agent;
a liquid medium in which 50% by weight or more of the liquid medium is an organic solvent;
a polyoxyethylene castor oil and/or a polyoxyethylene hardened castor oil, or a derivative thereof represented by the formula:
where:
X: an ethylene oxide group, CH2CH2O,
Y: H, CR or COCH2CH2COOH,
R: a fatty acid or hydroxyl group-containing fatty acid having C12 or more,
α+β+γ=an integer of 1 or more,
δ+ε+ξ=an integer of 1 or more, and
α+β+γ+δ+ε+ξ<80; and
one compound or a mixture of two or more compounds selected from the group consisting of a monoalkyl ether phosphoric acid, a polyoxyethylene monoalkyl ether phosphoric acid, a dialkyl ether phosphoric acid, a polyoxyethylene dialkyl ether phosphoric acid, a trialkyl ether phosphoric acid, and a polyoxyethylene trialkyl ether phosphoric acid.

### Claim 9 (depends on 8)

An ink composition for ballpoint pens according to claim 8; wherein the organic solvent is an alcohol-based and/or a glycol-based organic solvent.

### Claim 10 (depends on 9)

An ink composition for ballpoint pens according to claim 9; further comprising at least one of a butyral resin, a styrene acrylic resin and a ketone resin.