# US 5,702,512 A · Oil ink composition

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- Number: US 5,702,512 A
- Document ID: US5702512A
- Status: Granted
- Kind: A
- Application number: 08/607,317
- Filed: 1996-02-26
- Granted: 1997-12-30
- Earliest claimed: 1995-02-28
- Assignees: Mitsubishi Pencil Company, Limited
- Inventors: Masanao Yano; Takeshi Yadoiwa; Chie Yanase
- Web page: https://patentgrep.com/patent/US5702512A

## CPC

- C09D 11/16: Writing 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)

## Abstract

Oil ink composition of the present invention having titanium dioxide as pigment, resin and organic solvent contains a compound (A) which has at least one amide group (--CONH--) or amino group (--N<) and a compound (B) selected from phosphoric acid and phosphate compound. The oil ink composition is suitably used for a writing instrument such as a ball-point pen.

## Claims

### Claim 1

Oil ink composition comprising titanium dioxide as pigment, resin, organic solvent, a compound (A) which has at least one amide group (--CONH--) or amino group (--N<) and a compound (B) selected from the group consisting of phosphoric acid, pyrophosphoric acid, metaphosphoric acid, polyphosphoric acid, lauryl phosphate, polyoxylpropylene oleyl ether phosphate, polyoxylethylene(4) lauryl ether phosphate, and dipolyoxyethylene nonylphenyl ether phosphate.

### Claim 2 (depends on 1)

The oil ink composition as claimed in claim 1, wherein said compound (A) is added at a rate of 0.05 to 15 weight % of the total amount of the ink composition.

### Claim 3 (depends on 1, 2)

The oil ink composition as claimed in claim 1 or 2, wherein said compound (B) is added at a rate of 0.05 to 15 weight % of the total amount of the ink composition.

### Claim 4 (depends on 1)

The oil ink composition as claimed in claim 1, wherein said compound (A) is diethyl amino ethyloleyl amide and is added at a rate of 1 weight % of the total amount of the ink composition, and said compound (B) is polyphosphate and is added at a rate of 2 weight % of the total amount of the ink composition.

### Claim 5 (depends on 1)

The oil ink composition as claimed in claim 1, wherein said compound (A) is stearyl amine and is added at a rate of 2 weight % of the total amount of the ink composition, and said compound (B) is polyoxyethylene (4) lauryl ether phosphate and is added at a rate of 2 weight % of the total amount of the ink composition.

### Claim 6 (depends on 1, 2)

The oil ink composition as claimed in any one of claims 1 or 2, wherein said resin is alkyd resin, terpene phenol resin or rosin denatured maleic resin.

### Claim 7 (depends on 1, 2)

The oil ink composition as claimed in any one of claims 1 or 2, wherein said organic solvent is xylene or isopropanol.

### Claim 8 (depends on 1, 2)

The oil ink composition as claimed in any one of claims 1 or 2, wherein said oil ink composition is filled in a writing instrument comprising an ink reservoir having a stirring ball, and a pen top.