of dialkyl sulfosuccinate neat wherein each alkyl group comprises 8 to 18 carbon atoms a salt of dialkyl sulfosuccinate in solution or mixture wherein each alkyl group comprises 9 to 18 carbon atoms and a mixture of a salt of dioctyl sulfosuccinate and a salt of an aromatic carboxylic acid application_number US 31658481 A description the yarns of this invention can be processed by any spin draw process or spinning and separately drawing process available to the art and the patent and technical literature using any suitable polyamide or polyester the preferred polyesters are the linear terephthalate polyesters i e polyesters of a glycol containing from 2 to 20 carbon atoms and a dicarboxylic acid component containing at least about 75 percent terephthalate acid the remainder if any of the dicarboxylic acid component may be any suitable dicarboxylic acid such as sebacic acid adipic acid isophthalic acid sulfonyl 4 4 39 dibenzoic acid or 2 8 di benzofuran dicarboxylic acid the glycols may contain more than two carbon atoms in the chain e g diethylene glycol butylene glycol decamethylene glycol and bis 1 4 hydroxymethyl cyclohexane examples of linear terephthalate polyesters which may be employed include poly ethylene terephthalate poly butylene terephthalate poly ethylene terephthalate 5 chloroisophthalate 85 15 poly ethylene terephthalate 5 sodium sulfo isophthalate 97 3 poly cyclohexane 1 4 dimethylene terephthalate and poly cyclohexane 1 4 dimethylene terephthalate hexahydroterephthalate 75 25 uneven application of yarn overfinish during production of polyethylene terephthalate multifilament yarn led to an investigation of the emulsion.