Thermochromic coloring color-memory composition and thermochromic coloring color-memory microcapsule pigment containing the same

• US 20060112851A1
• Filed: 11/15/2005
• Published: 06/01/2006
• Est. Priority Date: 11/15/2004
• Status: Active Grant

• Current Assignee: The Pilot Ink Co. Ltd (Berkshire Hathaway Incorporated), Kabushiki Kaisha Pilot Corporation
• Original Assignee: The Pilot Ink Co. Ltd (Berkshire Hathaway Incorporated)
• Inventors: Fujita, Katsuyuki, Ono, Yoshiaki
• Granted Patent: US 7,494,537 B2
• Time in Patent Office: Days
• US Class Current: 106/31.160
• CPC Class Codes: B41M 5/305 with reversible electron-donor electron-acceptor compositions
• CPC Class Codes: B41M 5/337 Additives; Binders B41M5/46 takes precedence
• CPC Class Codes: C09D 11/17 characterised by colouring agents

Abstract

A thermochromic coloring color-memory composition comprising a homogeneous solubilized mixture of (A) an electron donative coloring organic compound, (B) an electron accepting compound and (C) a compound represented by the specific formula as a reaction medium which controls color reactions of the components (A) and (B).

Claims

1. A thermochromic coloring color-memory composition comprising a homogeneous solubilized mixture of (A) an electron donative coloring organic compound, (B) an electron accepting compound and (C) a compound represented by the following formula (I) or the following formula (II) as a reaction medium which controls color reactions of the components (A) and (B):

2. A thermochromic coloring color-memory microcapsule pigment comprising the thermochromic coloring color-memory composition of claim 1.

3. The thermochromic coloring color-memory microcapsule pigment according to claim 2, which discolors, showing a maximum hysteresis width of from 8°

C. to 70°

C. regarding a color density-temperature curve.

4. The thermochromic coloring color-memory microcapsule pigment according to claim 2 or 3, wherein the pigment has a complete decoloring temperature (T₄) of 40°

C. or higher and a coloring starting temperature (T₂) of 20°

C. or lower regarding the color density-temperature curve, and wherein said pigment has color-memory ability at the ordinary temperature range.