Aqueous dispersion for fiber treatment

An aqueous dispersion for fiber treatment which dispersion comprises:

• (A) a first propylene resin comprising 50 to 99% by mole of a constituting unit derived from propylene of an olefin component,
• (B) a second propylene resin which is a propylene resin at least containing a carboxylic acid salt bonded to a polymer chain and contains a group represented by the following formula (1) in a concentration of 0.05 to 5 mm mol equivalent weight per 1 gram of the resin;
• (C) an anion type and/or nonion type surfactant, and
• (D) water,
• wherein resin solid components derived from the resins (A) and (B) are dispersed in the water,
• the dispersion comprises 0.3 to 45 parts by weight of the resin (B), 0.5 to 40 parts by weight of the agent (C) based on 100 parts by weight of the resin (A), and has a water content of 3 to 90% by weight,
• the weight average molecular weight of the resin (A) (hereinafter referred to “Mw(a)”) and the weight average molecular weight of the resin (B) (hereinafter referred to “Mw(b)”) are different each other, the Mw(a) is larger than the Mw(b), and the resin solid components derived from the resins (A) and (B) have an average particle diameter of 0.03 to 3 μm.