Process for producing silane-modified polyolefins and extruder apparatus therefor

摘要

An object of the invention is to provide a process for producing a silane-modified polyolefin wherein a stabilized and efficient graft reaction can be effected in the step of modifying a polyolefin with a silane using an extruder. In charging a polyolefin, a vinylsilane compound and a radical polymerization initiator into an extruder and subjecting the charges to a graft reaction, the process of the invention is characterized in that the section of the cylinder barrel of a screw extruder extending from a feed zone to the position immediately preceding a plasticizing zone is set at a temperature lower than the boiling point of the vinylsilane compound. The process of the invention is further characterized in that the vinylsilane compound is injected into the extruder at a position where the polyolefin is subjected to a pressure not lower than the saturation vapor pressure of the vinylsilane compound. The process is further characterized in that when a silanol condensation catalyst is injected, the distance between a front liquid injection port and a vent is so determined that the mean residence time therebetween is 15 seconds to 15 minutes. <IMAGE>