| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an acid hair dye composition high in permeability into the hair, applicable uniformly onto the hair, and excellent in dyeability, safety and feeling in use. <P>SOLUTION: The acid hair dye composition comprises a dibasic acid ester compound represented by general formula I [wherein, R<SB>1</SB>is an alkylene group optionally having 2-4C substituent(s); R<SB>2</SB>and R<SB>3</SB>are each independently an alkyl optionally having 1-4C substituent(s); R<SB>4</SB>and R<SB>5</SB>are each independently H, methyl or ethyl; m and n are each independently an integer of 0-4, wherein (m+n)≥1 (excepting the case that R<SB>2</SB>and R<SB>3</SB>are ethyl groups at the same time and m and n are 1 at the same time)]. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
