GB1223750A - Process for the manufacture of amorphous ethylene copolymers - Google Patents

Abstract

1,223,750. Ethylene copolymerization FARBWERKE HOECHST A.G. 13 May, 1968 [13 May, 1967], No. 22717/68. Heading C3P. Ethylene is copolymerized with an α-monoolefin, optionally with a diolefin also, in suspension in a halohydrocarbon which does not dissolve the polymer using a co-ordination catalyst comprising a trito penta-valent vanadium compound and an organoaluminium compound together with a compound containing the grouping wherein hal stands for F, Cl or Br. The polymerization is carried out at - 30‹ C. to + 50‹ C., at 0-30 atmospheres gauge, using 0À001 mm. to 0À1 mm. of vanadium compound per litre of suspension medium and 20 to 200 moles of aluminium compound per mole of vanadium compound. Suitable diolefins include the usual acyclic conjugated and non-conjugated diolefins and also the alkenyl- and alkylidenenorbornenes and dicyclopentadiene. Specified vanadium compounds are VOCl 3 , VCl 4 , V(AcAc) 3 , V(AcAc) 2 OH, vanadium naphthenate and benzoate, VO(i-C 4 H 9 ) 3 , VO(i-C 3 H 7 ) 3 , VO(C 2 H 5 ) 2 Cl, and VO(OC 2 H 5 )Cl 2 . Suspension media include CH 2 Cl 2 , C 2 H 5 Cl, Cl.C 2 H 4 .Cl, Cl.CH 2 .CH.Cl.CH 3 and F 2 Cl.C.C.FCl 2 . The α,#-unsaturated ketones include 1,1,1 - trifluoro - 3,4,4 - trichlorobutene - (3) - one (2),2,4,4 - trifluoro - 3 - chlorocyclobutene (2)-one-(1), perchloro (compound A)- and 4,4-difluoro-2,3-dichloro-cyclobutene (2)-one (1) (compound B), and 1,1,1-trifluoro-3- chloro - 4,4 - dimethoxybutene - (3) - one (2). In the examples ethylene and propylene are copolymerized using VOCl 3 /(C 2 H 5 ) 3 Cl 3 Al 2 , CH 2 Cl 2 and compounds A and B above.