COMPOUNDS FOR REDUCING BACKGROUND COLOR IN COLOR CHANGE COMPOSITIONS

• US 20140275381A1
• Filed: 03/14/2014
• Published: 09/18/2014
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Segan Industries Inc.
• Original Assignee: Segan Industries Inc.
• Inventors: Ribi, Hans O.
• Granted Patent: US 9,528,004 B2
• Time in Patent Office: Days
• US Class Current: 524/317
• CPC Class Codes: B41M 2205/04 Direct thermal recording [DTR]
• CPC Class Codes: B41M 5/284 Organic thermochromic compounds
• CPC Class Codes: B41M 5/287 using microcapsules or microspheres only
• CPC Class Codes: B41M 5/305 with reversible electron-donor electron-acceptor compositions
• CPC Class Codes: B41M 5/323 Organic colour formers, e.g. leuco dyes
• CPC Class Codes: B41M 5/3333 Non-macromolecular compounds
• CPC Class Codes: B41M 5/3372 Macromolecular compounds
• CPC Class Codes: B41M 5/34 Multicolour thermography
• CPC Class Codes: C08J 2397/02 Lignocellulosic material, e.g. wood, straw or bagasse
• CPC Class Codes: C08J 3/22 using masterbatch techniques
• CPC Class Codes: C08K 5/103 with polyalcohols
• CPC Class Codes: C09D 11/50 Sympathetic, colour changing or similar inks
• CPC Class Codes: C09D 133/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes
• CPC Class Codes: C09D 5/29 for multicolour effects
• CPC Class Codes: C09D 7/41 Organic pigments; Organic dyes
• CPC Class Codes: C09D 7/63 organic

Abstract

Aspects of the invention include color change compositions having a color former and color developer composition that transitions from a first color state to a second color state upon application of an applied stimulus and an amount of a copolymer sufficient to eliminate background color of the color former and color developer composition during transition from the first color state to the second color state. Methods for preparing and devices employing the color change compositions of the invention are also described.

Claims

1. A color change composition comprising:

a composition comprising a color former and a color developer that transitions from a first color state to a second color state upon application of an applied stimulus; and

an amount of a copolymer sufficient to eliminate background color of the composition during transition from a first color state to a second color state.

2. The color change composition according to claim 1, wherein the copolymer comprises the formula:

3. The color change composition according to claim 2, wherein the copolymer comprises the formula:

14. The color change composition according to claim 2, wherein the copolymer comprises the formula:

29. The color change composition according to claim 1, wherein copolymer is present in the color change composition in an amount of 1% to 10% w/w.

30. The color change composition according to claim 1, wherein the color former changes color in response to a phase transition of the color developer.

31. The color change composition according to claim 30, wherein the phase transition is from solid to liquid.

32. The color change composition according to claim 1, wherein the applied stimulus is a change in temperature.

33. The color change composition according to claim 32, wherein the composition transitions from a colorless state to a colored state upon exposure to a change in temperature.

34. The color change composition according to claim 33, wherein the composition transitions from a colored state to a colorless state upon exposure to a change in temperature.

35. The color change composition according to claim 1, wherein the applied stimulus is solvation.

36. The color change composition according to claim 35, wherein the composition transitions from a colorless state to a colored state upon exposure to increasing solvation.

39. The color change composition according to claim 1, wherein the color former is a thermochromic dye.

40. The color change composition according to claim 39, wherein the thermochromic dye is a leuco dye.

41. The color change composition according to claim 1, wherein the color developer is a glycerol monostearate derivative.

42. The color change composition according to claim 1, wherein the color former comprises two or more distinct leuco dyes.

43. The color change composition according to claim 42, wherein the two or more distinct leuco dyes exhibit opposing transition characteristics in response to the same applied stimulus.

44. The color change composition according to claim 43, wherein the color change composition transitions from a red color state to a green color state upon application of the applied stimulus.

45. The color change composition according to claim 1, wherein the color developer consists of a glycerol monostearate derivative.

4-13. -13. (canceled)

15-28. -28. (canceled)

37-38. -38. (canceled)

46. A method of making a color change composition, the method comprising:

combining a composition comprising a color former and a color developer with an amount of a copolymer to produce a color change composition which changes from a first color state to a second color state upon application of an applied stimulus.

47-117. -117. (canceled)