公开(公告)号：ES2030018T3

公开(公告)日：1992-10-16

申请号：ES87108679

申请日：1987-06-16

Applicant: PHILLIPS PETROLEUM COMPANY

Inventor： MCDANIEL, MAX PAUL ,  KLENDWORTH, DOUGLAS DEAN ,  NORWOOD, DONALD DWIGHT ,  HSIEH, ERIC TSU-YIN ,  BOGGS, ELIZABETH ANN

IPC: C08F4/60 ,  C08F4/62 ,  C08F4/69 ,  C08F10/00 ,  C08F10/02 ,  C08F110/02

Abstract: The catalyst system is produced by first forming a chromium catalyst on a predominantly silica support, activating in an oxygen-containing ambient and thereafter subjecting the thus activated composition to carbon monoxide reduction. The resulting reduced supported chromium catalyst composition is then precontacted with a cocatalyst selected from trialkyl boron compounds and dialkyl aluminum alkoxide compounds, preferably triethyl borane and thereafter contacted with ethylene. This results in a catalyst system which produces comonomer in situ so as to give tough, flexible ethylene copolymers from an essentially pure ethylene feed.