GB1051183A - - Google Patents

Abstract

1,051,183. Polymerization of olefines in two reactors. E. I. DU PONT DE NEMOURS & CO. June 6, 1963 [June 7, 1962], No. 22618/63. Heading C3P. One or more α-olefines containing 2 to 18 carbon atoms are polymerized by introducing into a tubular reaction zone maintained at a pressure of 100 to 200 atmospheres and a temperature of 50‹ to 250‹ C. and having a controlled increasing temperature profile between its inlet and outlet, the α-olefines and an inert non-polymerizable diluent, polymerizing 15 to 80% by weight of the total α-olefine being polymerized with a catalyst formed by admixing at a molar ratio of 0À5 to 4À0, a reducing agent selected from organometallic compounds, metals and metal hydrides, and a compound of a Group IV B or V B metal (see Periodic Table in Handbook of Chemistry and Physics), continuously passing the reaction mixture from said tubular reactor, after an average time of 0.5-100 seconds, directly into a constant environment autoclave reactors maintained at a pressure of 100 to 200 atmospheres and a temperature of 150‹ to 350‹ C., continuously removing the reaction mixture containing less than 20 weight per cent polymer in diluent, from said autoclave reactor after an average time of at least 0À5 minute and separating the polymer from the reaction mixture. The polymers produced have a melt index of 0.1 to 20, a stress exponent greater than 1À5 and are comprised of 30 to 80 weight per cent of a first component which contains a plurality of fractions and has a continuous distribution of molecular weights, said fractions having melt indexes in the range 1 x 10<SP>-4</SP> to 1.0, with the ratio of the highest melt index to the lowest melt index of fractions within the said fractions being in the range 100 to 10,000, and 20 to 70 weight per cent of a second component having a stress exponent of less than 14 and which contains a plurality of fractions and has a continuous distribution of molecular weights, said fractions having melt indexes in the range greater than 1À0 up to 3000 with the ratio of the highest melt index to the lowest melt index of fractions within the said fractions being in the range 3000 to 5000, the ratio of the melt index of the second component to the melt index of the first component in said hydrocarbon polymer is in the range 500-10,000. In the examples the catalyst employed is the reaction product of aluminium triisobutyl, vanadium oxychloride and titanium tetrachloride.