METHOD OF CONTINUOUS EXTRUSION TO PRODUCE GRAFT POLYMERS Russian patent published in 2009 - IPC B29C47/78 

FIELD: process engineering.

SUBSTANCE: continuous-extrusion reactor comprises 1^st and 2^nd extruders connected consecutively via an adapter and feature L-to-D ratio of 60:1. It comprises polymer feed and drying zones, transfer zone arranged inside transfer device and 1^st injection zone to feed 1^st set of reagents. The said set contains 1^st functionalising compound and 1^st free-radial initiator. Aforesaid 1^st injection zone is located in either 1^st or 2^nd extruder. Proposed extrusion reactor has reaction zone located downstream of injection zone for reaction of the said 1^st set of regents with polymer to produce frat polymer, and modification zone shifted downstream of reaction zone to reduce mean molecular weight of graft polymer.

EFFECT: higher efficiency.

34 cl, 6 dwg, 9 tbl, 4 ex