Organic pigment with high transparency and hydrophobicity
AssigneeClariant Finance (BVI) Limited
InventorsIsao Hashimoto, Noboru Tsuda, Hiroshi Ohsawa, Tomonori Okazaki, Manabu Shiga, Kohei Ohtsuki
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Abstract
The present invention provides Pigment Yellow 180 having an excellent transparency produced by using a fine slurry of 5-acetoacetylamino-benzimidazolone as a coupling component when Pigment Yellow 180 is produced by coupling reaction of 5-acetoacetylamino-benzimidazolone and diazo component obtained by diazotization of 1,2-bis(2-aminophenoxy)ethane.
Claims8
Pigment Yellow 180,transparency of −2 or less of dL value, wherein the dL value is obtained by comparing brightness, measured by spectrophotometer, of the Pigment Yellow 180 with that of a control product.
A method for producing Pigment Yellow 180 comprising the steps of diazotizing 1,2-bis(2-aminophenoxy)ethane to obtain diazo component, and coupling the diazo component with a fine slurry of 5-acetoacetylamino-benzimidazolone to form the Pigment Yellow 180.
Dependencies are inferred from the claim text.