| abstract |
PURPOSE: To obtain a copolymer useful as a dispersing agent and a mud stabilizer by radically polymerizing maleic anhydride and a polymerizable component of a naphtha oil composed mainly of indene and an aromatic hydrocarbon having reactive double bond. n CONSTITUTION: The objective copolymer is produced by the radical polymerization reaction of (A) a polymerizable component of a naphtha oil composed mainly of indene and an aromatic hydrocarbon having reactive double bond and (B) maleic anhydride in a reaction solvent (preferably benzene, toluene, ethylbenzene, xylene, cumene, etc.). The component (A) preferably contains ≥5wt.% or polymerizable components composed of (i) 70-99wt.% of indene, (ii) 0.5-29.5wt.% of styrene and (iii) 0.5-29.5wt.% of one or more compounds selected from α-methylstyrene, methylstyrene, methylindene, dimethylstyrene, trimethylstyrene, coumarone and dicyclopentadiene. n COPYRIGHT: (C)1991,JPO&Japio |