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In a previous communication,*** we described the technology for manufacturing modified polyester (MPES) fibre in which a product from Schill and Scheilacher, Ukanol (trade mark Ukanol DMSip, sulfoisophthalic acid Na salt dimethyl ester) was used as a modifier. Data on the good dyeability of this fibre with disperse dyes without use of carriers and pressure were also reported.The research was continued to investigate the possibility of dyeing MPES fibre with cationic dyes. The laboratory experiments were conducted on dyeing equipment designed by the Central Scientific-Research Institute of Wool. For comparison, Nitron fibre was dyed in the same way (Table 1) In analyzing the results for dyeing, we noted that cationic Blue O and cationic Red 5G produced colors (blue and red, respectively) in both Nitron and MPES fibres. The color saturation was slightly lower in MPES fibre. Cationic Black Z produced a good black color in Nitron, which should have been expected, and MPES fibre was dyed a dark green color.

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