Sizing composition and method of making same and use thereof for sizing textile yarns

A composition for sizing warps of textile yarns comprising in aqueous solution

• (a) an anionic polyester-urethane of molecular weight between 10,000 and 100,000 having a plurality of polyester blocks therein derived from at least one chain formation of units of the formulas (I) and (II), said blocks being joined together by groups of the formula (III) ##STR5## wherein:
• R.sub.1 is a divalent radical represented by a saturated hydrocarbon radical, an unsaturated aliphatic hydrocarbon radical or a monocyclic aromatic radical;
• R.sub.2 is a divalent radical represented by a saturated aliphatic radical or a saturated cyclic hydrocarbon radical;
• R.sub.3 is a divalent radical selected from ##STR6## M being an alkali metal;
• R.sub.4 is a divalent radical selected from the group consisting of hexamethylene, tetramethylhexamethylene, ##STR7## m-phenylene, p-phenylene, 2,4-tolylene, 2,6-tolylene, dicyclohexylmethane-4,4'-diyl, diphenylmethane-4,4'-diyl and naphthalene-1,5-diyl;
• and
• (b) a polymer derived from
• (i) an acrylic monomer of the formula:
• CH.sub.2 .dbd.CX--Y (IV)
• wherein X is a hydrogen atom or methyl radical and Y is one of the following groups:
• --COOH
• --COOZ
• (Z being an alkyl radical containing 1 to 8 carbon atoms) ##STR8## and/or (ii) a vinyl monomer corresponding to the formula:
• CH.sub.2 .dbd.CH--OOCR (V)
• in which R is a hydrocarbon radical having from 1 to 20 carbon atoms,
• wherein sid composition comprises from about 40 to about 90 weight percent of said polyester-urethane and from about 10 to 60 weight percent of said polymer of (b).