AND DYEABILITY OF SODIUM SULPHOISOPHTHALA TE-POL Y (ETHYLENETHEREPHTHALA TE) COPOL YESTER TO BASIC (CATIONIC) AND DISPERSE (NONIONIC) DYES. Copolyester of sodium sulphoisophthalate -poly (ethyleneterephthalate) was obtained from polyesteryfication of three monomers,dimethylterephthalate, ethyleneglycol and sodium sulpho-dimetilisophthalate (Na-SIP). To the copolyester yields containing ofNa-SIP 2.5% (CDP-025) and 5% (CDP-050), as well as homo polyiester of poly (ethylen terephtalate) or PET, were subjected.to functional group analysis by means of infrared spectrometer FTIR, to prove the existance of sulphonic ion in the COPcopolyester responsible for cationic dyeability. The yields COP and PET synthesis were treated with dyeing process to basicdyes (cationic) and compared its dyeability to disperse dyes (nonionic). The dyes were selected from the same basic structures,whereas for yellow colour contained of para anisidin and methin (c.!. Basic Yellow 28), for red colour contained of N,N'-monoazo-2-chloro-4-nitrobenzena, 4'-dimethylaminobenzena (C.!. Basic Red 18 and C.I. Disperse Red 50), as well as for bluecolour contained of l-aminomethyl-4-aminoethyl anthraquinone (C.!. Basic Blue 22 and C.Io Disperse Blue 9). Dyeing processwere carried out by using 2% dye concentration for each single colour and for black colour was carried out by combination ofcolours containing of yellow 3%, red 3% and blue 2%. It is shown from the FTIR analysis that the respected functional groupswith each wave numbers were reported as follows, hydroxyl (3350 cmol), carbonil (1720 em-I), carboxyl (1600 em-I), phtalate(1320 em-I), ether aromatic (1260 em-I), ethyl (1130 em-'), substitution of meta/para (1600 em-I and 795 em-I) which belongedto either PET or Co-PET. The existance of sulphonate ion absorption at the wave number 625 em-I has proved the goal of COPcopolyester synthesis. Dyeing yields for single and combination of colours with highest dyeability to basic and dieperse dyeswere obtained from the respected samples at each dyeing temperature: CDP-050 (100°C), CDP-025 (1200C), and PET (130°C).This phenomenon has shown that the copolyester of sodium sulpha isophtalate-poly (ethylene terephtalate) obtained from thissynthesis has higher dyeability to either basic or disperse dye, compared to its dyeability to regular poly (ethyleneterephtalate)oKata kunci : Kopoliester, Natrium Sulfoisofalat, Poli (Etilenatareftalat, Zat warna basa, Dispersi. Isminingsih Gitopadmojo; BALAI BESAR LITBANG INDUSTRI TEKSTIL
