Mitsubishi Petrochemical Company Limited

Riichiro Maruta

Kazuhide Hayama

Takayuki Inoue

Junji Mayumi

Masafumi Hattori

A process of purifying maleic anhydride graft polyolefin comprising the steps of adding an aqueous solution of alkali initial hydroxide to a solution of maleic anhydride graft polyolefin containing unreacted maleic anhydride which is dissolved in an organic solvent at a temperature from 80.degree. C. to 160.degree. C., thereby precipitating maleic anhydride graft polyolefin particles to make a W/O emulsion; stirring the W/O emulsion while maintaining the temperature at a same temperature as above for less than 2 hours, thereby selectively forming the alkali metal salt of unreacted maleic anhydride; adding the aqueous solution of alkali metal hydroxide to the W/O emulsion to convert the W/O emulsion into an O/W emulsion; separating the maleic anhydride draft polyolefin particles, and washing the maleic anhydride graft polyolefin particles with water.

Process of purifying maleic anhydride-modified polyolefin

A primer composition for olefin resins is disclosed, comprising Components (A) and (B):

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Mie, Japan

Riichiro Maruta