Stabilizer of color former and use thereof
AssigneeARKRAY, Inc.
InventorsSatoshi Yonehara, Norio Inamura
Life of this patent
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Abstract
The present invention provides a stabilizer that can stabilize a salt of 10-(carboxymethylaminocarbonyl)-3,7-bis(dimethylamino)phenothiazine or a derivative thereof even under the existence of moisture or under light irradiation. A compound described in at least one of (1) and (2) below is used as the stabilizer of the salt of 10-(carboxymethylaminocarbonyl)-3,7-bis(dimethylamino)phenothiazine or the derivative thereof. (1) a surfactant having an alkyl group with a carbon number of 8 to 16 (2) at least one pigment substance selected from the group consisting of a compound represented by the following formula (I), a compound represented by the following formula (II), and a flavonoid pigment
Claims4
A method for stabilizing 10-(carboxymethylaminocarbonyl)-3,7-bis(dimethylamino)phenothiazine or a salt thereof, the method comprising
- causing the 10-(carboxymethylaminocarbonyl)-3,7-bis(dimethylamino)phenothiazine or a salt thereof to be present with the following compounds (2) and (3):
- (2) a compound represented by the following formula (I):
- R1—N═N—R2 (I)
- wherein R1 is
- and R2 is
- wherein
- each X is independently hydrogen, halogen, sodium or potassium;
- each Y is independently hydrogen or SO3X;
- and
- each Z is independently hydrogen, a methyl group or a methoxy group;
- and,
- (3) a quaternary ammonium having a hydrocarbon group with a carbon number of 12 or higher or a salt thereof.
Dependencies are inferred from the claim text.