# US 8,784,546 B2 · W/O-type emulsion ink composition for writing utensil and writing utensil

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- Number: US 8,784,546 B2
- Document ID: US8784546B2
- Status: Granted
- Kind: B2
- Application number: 13/580,261
- Filed: 2010-12-27
- Published: 2013-08-08
- Granted: 2014-07-22
- Earliest claimed: 2010-02-26
- Assignees: Zebra Co., Ltd.
- Applicants: Makoto Ugajin; Eriko Nemoto; Makoto Fuse; Taku Fukai
- Inventors: Makoto Ugajin; Eriko Nemoto; Makoto Fuse; Taku Fukai
- Web page: https://patentgrep.com/patent/US8784546B2

## CPC

- C09D 5/022: {Emulsions, e.g. oil in water}
- B43K 7/00: Ball-point pens ({B43M11/085 takes precedence}; multiple-point writing implements B43K27/00)
- B43K 7/03: pressurised, e.g. by gas
- B43K 7/08: Preventing leakage
- B43K 8/00: Pens with writing-points other than nibs or balls (brushes with reservoir for supplying substances A46B11/00)
- B43K 8/03: Ink reservoirs; Ink cartridges
- C09D 11/17: characterised by colouring agents
- C09D 11/18: specially adapted for ball-point writing instruments
- C09D 11/50: Sympathetic, colour changing or similar inks
- 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)
- B43K: IMPLEMENTS FOR WRITING OR DRAWING (containers, casings or accessories for cosmetic substances, e.g. shaving soap, lipstick, make-up A45D34/00, A45D40/00)

## Abstract

A W/O-type emulsion ink composition for a writing tool having an aqueous component dispersed in an oil component, the oil component including a fluorescent coloring agent, and the aqueous component including a fluorescent whitening agent and water.

## Claims

### Claim 1

A W/O emulsion ink composition for a writing tool, comprising:
an oil component; and
an aqueous component dispersed in the oil component;
wherein the oil component includes a fluorescent coloring agent, and the aqueous component includes a fluorescent whitening agent and water.

### Claim 2 (depends on 1)

The W/O emulsion ink composition for a writing tool according to claim 1, wherein the fluorescent whitening agent has a stilbene structure.

### Claim 3 (depends on 1)

The W/O emulsion ink composition for a writing tool according to claim 1, wherein the pH of the aqueous component is 8.9 or higher.

### Claim 4 (depends on 1)

The W/O emulsion ink composition for a writing tool according to claim 1, wherein the mass ratio of the oil component with respect to the aqueous component is between 1.5 and 4.

### Claim 5 (depends on 1)

A writing tool comprising the W/O emulsion ink composition for a writing tool according to claim 1.

### Claim 6 (depends on 2)

The W/O emulsion ink composition for a writing tool according to claim 2, wherein the pH of the aqueous component is 8.9 or higher.

### Claim 7 (depends on 2)

The W/O emulsion ink composition for a writing tool according to claim 2, wherein the mass ratio of the oil component with respect to the aqueous component is between 1.5 and 4.

### Claim 8 (depends on 3)

The W/O emulsion ink composition for a writing tool according to claim 3, wherein the mass ratio of the oil component with respect to the aqueous component is between 1.5 and 4.