FIELD: polymer fibers.
SUBSTANCE: invention relates to technology of producing high-quality mixed yarns constituted by polyester fibers having different degrees of shrinkage and characterized by good color tone and lack of napping, which allow the yarns to be applied in textile industry. Ester used to produce yarn is prepared by using catalyst comprising, in the first embodiment of invention, mixture consisting of (i) Ti compound component composed by one or several specimens selected from Ti alkoxides of general formula I and products of reaction between these alkoxides and carboxylic acids of general formula II or their anhydrides and (ii) phosphorus compound component consisting of a compound depicted by general formula III. According to second embodiment, catalyst comprises product prepared by reaction between Ti compound component composed by one or several specimens selected from Ti alkoxides of general formula I and products of reaction between these alkoxides and carboxylic acids of general formula II or their anhydrides and (ii) phosphorus compound component of general formula IV.
EFFECT: enlarged resource for polymer fibers.
10 cl, 4 tbl, 9 ex
