Copolyester fiber

Details Copolyester fiber Copolyester fiber

C - Chemistry, Metallurgy

08

G

402/202

C08G 63/68 (2006.01) C08G 63/692 (2006.01) D01F 6/84 (2006.01)

Patent

CA 1301996

IMPROVED COPOLYESTER FIBER ABSTRACT OF THE DISCLOSURE An improved copolyester fiber capable of being dyed with cationic dyes and having an excellent brightness, heat resistance and a satisfactory mechanical strength comprises a copolyester resin comprising a polymerization product of at least one aromatic dicarboxylic acid compound, at least one alkylene diol compound and at least one quaternary phosphonium organic sulfonate of the formula (I): Image (I) wherein A - an aromatic or aliphatic radical, X1 = H or an ester-forming organic radical, X2 = an ester- forming organic radical, R1, R2, R3 and R4 - an alkyl or aryl radical, n = 1 or more, and having an [n]f of 0.5 ox more, the copolyester fiber having a silk factor of 25 or more and exhibiting the number of scission of backbone chains of the copolyester molecules of 140 x 1023 or less per 106 g of fiber when wet heat-treated in a solution of 0.4 g/l of acetic acid in distilled water at 130°C for 60 minutes.

557219

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