According to the present invention, the weight content of the unit polymer compound derived from ethylenically unsaturated carboxylic acid is 10% or more, and the properties of the (meth) acrylic copolymer have a hardness of greater than or equal to the water-dispersible sulfonated polyester. , As an aqueous dispersion of a polymer blend containing a (meth) acrylic-ethylenically unsaturated carboxylic acid copolymer present at least partially grafted to the water-dispersible sulfonated polyester having a Pesos hardness of at least 60 or present in the polymer blend as a mixture. A composition for sizing of constructed textile fibers or yarns, and further comprising immersing the yarn at a desired temperature in the composition, pressing through a hydro-extacting roller and finally drying the sized yarn in a heating cylinder. To a sizing method of a textile warp comprising: .
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