Abstract
Phthalimide‐based alkali‐clearable azo disperse dyes were synthesised and applied to polyester and polyester/cotton blends. These dyes have an alkali‐clearable property that enables alkaline treatment to be substituted for conventional reduction clearing. Therefore, by using these dyes, it is possible to avoid generating dyehouse effluents with high BOD values and carcinogenic aromatic amines that may, in some cases, be liberated by reduction clearing. In addition, polyester/cotton blends can be dyed by a one‐bath, two‐step dyeing method, as alkali clearability enables the disperse and reactive dyes to be used in the same bath. The dyeing behaviour and fastness properties of these dyes have been investigated. In particular, the cross‐staining of cotton was studied to estimate the suitability of the dyes synthesised for dyeing polyester/cotton blends.
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