Colorant, microcapsule pigment prepared by using the same and ink composition for writing instrument

Patent metadata

Field	Value
Publication number	US-9315672-B2
Application number	US-201214350842-A
Country	US
Kind code	B2
Filing date	Oct 5, 2012
Priority date	Oct 25, 2011
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

Provided are a colorant represented by the following Formula (I) which is excellent in a color intensity and a lightfastness, a microcapsule pigment including the colorant, a developer and a chromic temperature controller and an ink composition for writing instruments including the microcapsule pigment:

wherein X and Y represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a halogen atom; and X and Y may be identical or different from each other, provided that a case in which both of X and Y are a hydrogen atom is excluded.

First claim

What is claimed is:

1. A blue colorant comprising a leuco dye represented by the following Formula (I):

wherein X and Y represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a halogen atom; and X and Y may be identical or different from each other, provided that a case in which both of X and Y are a hydrogen atom is excluded.

2. The blue colorant as described in claim 1 , wherein at least one of X and Y is a methyl group or a chlorine atom.

3. A microcapsule pigment comprising at least the blue colorant as described in claim 1 , a developer and a chromic temperature controller.

4. A microcapsule pigment comprising at least the blue colorant as described in claim 2 , a developer and a chromic temperature controller.

5. An ink composition for writing instruments comprising the microcapsule pigment as described in claim 3 .

6. An ink composition for writing instruments comprising the microcapsule pigment as described in claim 4 .

Assignees

• Mitsubishi Pencil Co

Inventors

• Ichikawa Shuji

Classifications

• C09B67/0013

  with polymeric coatings · CPC title

• C09B67/0097

  Dye preparations of special physical nature; Tablets, films, extrusion, microcapsules, sheets, pads, bags with dyes · CPC title

• C09B11/24 Primary

  Phthaleins containing amino groups {; Phthalanes; Fluoranes; Phthalides; Rhodamine dyes; Phthaleins having heterocyclic aryl rings; Lactone or lactame forms of triarylmethane dyes} · CPC title

• C09D11/17

  characterised by colouring agents · CPC title

• C09K2211/1088

  containing oxygen as the only heteroatom · CPC title