Binder resin for polyolefin resin, process for producing the same, and uses thereof

A method of producing binder resin for polyolefinic resins comprising carboxyl group-containing chlorinated polyolefin (II), which is a carboxyl group-containing chlorinated polyolefin, which contains not more than 2% wt. of a component with molecular weight of 2,000 or lower, being the low-molecular weight region of said carboxyl group-containing chlorinated polyolefin, and which carboxyl group-containing chlorinated polyolefin (II) has a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) of not more than 4, characterized in that the low-molecular weight region of carboxyl group-containing chlorinated polyolefin obtainable by graft copolymerizing at least one kind of unsaturated carboxylic monomer selected from carboxylic acid and/or carboxylic anhydride onto a polyolefin (I) in amounts of 1 to 10 wt. % is removed by solvent extraction within a temperature range of 10° C. to 100° C., using a sole solvent selected from a group consisting of aliphatic hydrocarbon, aromatic hydrocarbon, alicyclic hydrocarbon, halogenated hydrocarbon, alcohols, esters, ketones and ethers with boiling point of lower than 120° C. or a mixed solvent thereof, and then chlorination is conducted to a chlorine content of 10 to 30 wt. %.

A method of producing binder resin for polyolefinic resins comprising carboxyl group-containing chlorinated polyolefin (II), which is a carboxyl group-containing chlorinated polyolefin, which contains not more than 2% wt. of a component with molecular weight of 2,000 or lower, being the low-molecular weight region of said carboxyl group-containing chlorinated polyolefin, and which carboxyl group-containing chlorinated polyolefin (II) has a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) of not more than 4, characterized in that at least one kind of unsaturated carboxylic monomer selected from carboxylic acid and/or carboxylic anhydride is graft copolymerized onto a polyolefin (I) in amounts of 1 to 10 wt. %, and then the low-molecular weight region of carboxyl group-containing chlorinated polyolefin chlorinated to chlorine content of 10 to 30 wt. % is removed by solvent extraction within a temperature range of 0° C. to 100° C., using a sole solvent selected from a group consisting of aliphatic hydrocarbon, aromatic hydrocarbon, alicyclic hydrocarbon, halogenated hydrocarbon, alcohols, esters, ketones and ethers with boiling point of lower than 120° C. or a mixed solvent thereof.