Thermosensitive recording material

• US 8,283,287 B2
• Filed: 09/11/2008
• Issued: 10/09/2012
• Est. Priority Date: 09/13/2007
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Aihara, Hideo, Sawamura, Ichiro, Tohmatsu, Hiroshi, Watari, Hirokazu, Okada, Shinji
• Primary Examiner(s): Hess, Bruce H
• Application Number:
  US12/208,848
• Publication Number:
  US 20090075817A1
• Time in Patent Office: 1,489 Days
• Field of Search: None
• US Class Current: 503/226
• CPC Class Codes: B41M 5/44 characterised by the macromolecular compounds

Abstract

A thermosensitive recording material including a support, a thermosensitive recording layer composed mainly of a leuco dye and a developer, provided on one surface of the support, and a back layer provided on the other surface of the support, wherein the back layer contains an isobutylene-maleic anhydride copolymer ammonium salt, and at least one of an aziridine compound, and a cross-linked product of the isobutylene-maleic anhydride copolymer ammonium salt and the aziridine compound.

Claims

1. A thermosensitive recording material comprising:

a support,

a thermosensitive recording layer composed mainly of a leuco dye and a developer, provided on one surface of the support, and

a back layer provided on the other surface of the support,

wherein the back layer contains an isobutylene-maleic anhydride copolymer ammonium salt, and at least one of an aziridine compound, and a cross-linked product of the isobutylene-maleic anhydride copolymer ammonium salt and the aziridine compound,

wherein the thickness of the back layer is 1 μ

M to 50 μ

M, and

wherein the aziridine compound is 2,2-bis(hydroxymethyl)butanoltris[3-(1-aziridinyl)propionatel].

2. The thermosensitive recording material according to claim 1, wherein the back layer further contains an antistatic agent.

3. The thermosensitive recording material according to claim 2, wherein the antistatic agent is a polystyrene sulfonic acid salt.

4. The thermosensitive recording material according to claim 2, wherein the antistatic agent is a salt of a copolymer of styrene sulfonic acid and maleic acid.

5. The thermosensitive recording material according to claim 4, wherein in the back layer, 0.2 parts by mass to 1 part by mass of an aziridine compound is contained in relation to 1 part by mass that is the total amount of an isobutylene-maleic anhydride copolymer ammonium salt and the salt of the copolymer of styrene sulfonic acid and maleic acid also contained.

6. The thermosensitive recording material according to claim 2, wherein in the back layer, 1 part by mass to 3 parts by mass of the antistatic agent is contained in relation to 1 part by mass of an isobutylene-maleic anhydride copolymer ammonium salt also contained.

7. The thermosensitive recording material according to claim 1, wherein the back layer contains polyvinyl alcohol.

8. The thermosensitive recording material according to claim 7, wherein the back layer is obtained by applying and drying a coating solution which contains at least the isobutylene-maleic anhydride copolymer ammonium salt, the aziridine compound and the polyvinyl alcohol, and the mass ratio of the isobutylene-maleic anhydride copolymer ammonium salt to the polyvinyl alcohol in the coating solution is in the range of 3/7 to 9/1.

9. The thermosensitive recording material according to claim 1, wherein the back layer contains an amorphous inorganic pigment having a volume average particle diameter of 1 μ

m to 3 μ

m, a spherical organic pigment having a volume average particle diameter of 5 μ

m to 7 μ

m, and a spherical organic pigment having a volume average particle diameter of 12 μ

m or greater.

10. The thermosensitive recording material according to claim 1, wherein the support is a biaxially-stretched film composed mainly of polypropylene.