Patent ID: 7666941

Claim:
An aqueous polyolefin resin dispersion comprising a polyolefin resin, a basic compound and an organic solvent, wherein the polyolefin resin contains 0.5 to 20% by mass of an unsaturated carboxylic acid unit, a propylene component, a butene component and an ethylene component, in which the component ratio is 8 to 90 parts by mass of the propylene component, 8 to 90 parts by mass of the butene component and 2 to 50 parts by mass of the ethylene component based on the total of the three components of 100 parts by mass, the basic compound has a boiling point of lower than 185° C. at normal pressure, and the amount of the basic compound is 0.5 to 3.0 equivalents based on the amount of carboxyl groups in the polyolefin resin, the aqueous dispersion contains substantially no water-compatibilizing agent having a boiling point of 185° C. or higher at normal pressure, the polyolefin resin has a number average particle size of 1 μm or smaller in the aqueous dispersion, and the organic solvent is present in an amount not more than 50% by mass, has a boiling point of lower than 185° C., and has solubility in water of not less than 10 g/L at 20° C.