| 摘要 |
A filament-forming polyester or copolyester and fibers thereof composed of at least 80% of ethylene terephthalate units containing a tertiary amine as an additive to improve the receptivity for acid dyes. The invention provides novel additives comprising 1,8-diamino-naphthalenes in which the two amino groups have four alkyl substituents with 1-4 carbon atoms and the nucleus may have H, alkyl or aralkyl substituents. The preferred additive is N,N,N',N'-tetramethyl-1,8-diamino-naphthalene. A preferred copolyester contains 1-10% ethylene azelate units. The novel additives improve the exhaustion of the dye bath and the wash fastness of the dyed filaments.
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