Aqueous polyolefin resin dispersion, process for producing the same, and water-based coating material comprising the same

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, an ethylene component and 20% by mass or less of a (meth)acrylic ester 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.

An aqueous polyolefin resin dispersion comprising a polyolefin resin, a basic compound and an organic solvent, wherein

• the polyolefin resin consists of 0.5 to 20% by mass of an unsaturated carboxylic acid unit, a propylene component and an ethylene component only,
• 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.

A water-based coating material comprising a polyolefin resin (A), another resin (B) as required, a pigment or a dye (C), a basic compound and an organic solvent, wherein

• the polyolefin resin (A) 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 water-based coating material has a mass ratio of (A) to (B), (A)/(B), of 100/0 to 10/90,
• 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 (A),
• the water-based coating material contains substantially no water-compatibilizing agent having a boiling point of 185° C. or higher at normal pressure,
• the polyolefin resin (A) has a number average particle size of 1 μm or smaller, 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.

A water-based coating material comprising a polyolefin resin (A), another resin (B) as required, a pigment or a dye (C), a basic compound and an organic solvent, wherein

• the polyolefin resin (A) contains 0.5 to 20% by mass of an unsaturated carboxylic acid unit, a propylene component, a butene component, an ethylene component and 20% by mass or less of a (meth)acrylic ester 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 water-based coating material has a mass ratio of (A) to (B), (A)/(B), of 100/0 to 10/90,
• 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 (A),
• the water-based coating material contains substantially no water-compatibilizing agent having a boiling point of 185° C. or higher at normal pressure,
• the polyolefin resin (A) has a number average particle size of 1 μm or smaller, 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.

A water-based coating material comprising a polyolefin resin (A), another resin (B) as required, a pigment or a dye (C), a basic compound and an organic solvent, wherein

• the polyolefin resin (A) consists of 0.5 to 20% by mass of an unsaturated carboxylic acid unit, a propylene component and an ethylene component only,
• the water-based coating material has a mass ratio of (A) to (B), (A)/(B), of 100/0 to 10/90,
• 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 (A),
• the water-based coating material contains substantially no water-compatibilizing agent having a boiling point of 185° C. or higher at normal pressure,
• the polyolefin resin (A) has a number average particle size of 1 μm or smaller, 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.