Benzoquinone dye, rope-dyeing dye compositions, cotton rope- dyeing methods using same, and the thus dyed materials

摘要

Denim cotton warp yarns are rope-dyed with a benzoquinone dye of formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.1 ', R. sub. 2 ' and R.sub.3 ' commonly or independently represent a hydrogen atom, a halogen atom, alkyl, cycloalkyl, alkenyl, aryl, aralkyl, alkoxyl or alkoxyalkyl alone or in combination with a red .sup.2,3' - biindolin-3,2'-dione dye and/or a blue indigoid dye or sequentially with the latter dye.