Trivalent titanium component prepn. for Ziegler-Natta catalyst system - by grinding titanium tri:chloride complex with phosphorus cpd. and reacting with ether and/or ester

摘要

In the prepn. of a new Ti(III)-component (1) for Ziegler-Natta catalyst systems, a Ti-contg. cpd. having TiCl3.nAlCl3, (A), (where n is 0.01-1) is ground with a P-contg. cpd. having formula OmP(R1)3, (B), (where m is 0 or 1 ; R1 is R2, OR2 or N(R2)2 and R2 is 1-24C alkyl, aryl, alkaryl or aralkyl). Specific grinding conditions are used. (B) is added to (A) in quantities corresponding to molar ratio Ti in (A) : (B) 1 : 0.01 to 1 : 1. A suspension of (i) 1 pt.wt. of prod.; (ii) 0.5-20 pts.wt. hydrocarbon, (C), liq. under normal conditions and boiling below 150 deg.C; and (iii) an O-contg. cpd. (D) is prepd. (D) can be a 4-30C ether of formula R8-O-R8' (where R8 and R8' are 1-15C alkyl, Ph or 7-14C alkyl-phenyl) and/or a 2-34C ester having formula R9'-O-CO-R9 or R9'-O-CO-CR9=CHR9 (where R9 is H, 1-12C alkyl, 7-14C phenyl-alkyl in which Ph is opt. mono-alkyl substd., Ph or 7-14C alkyl-phenyl ; R9' is 1-8C alkyl, Ph or 7-14C phenyl-alkyl). (D)-quantities are such that molar ratio Ti in (A) to (D) is 1 : 0.01 to 1 : 2. The suspension is strongly stirred 5-120 min. at 40-140 deg. C and cooled to 15-25 deg.C. The solid separated from the suspension is opt. washed with a hydrocarbon, liq. under normal conditions and boiling below 150 deg.C and dried to recover the new Ti(III)-componentt (1). The catalyst systems are used in 2-6C alpha-mono-olefin (co)polymerisation. Stereoregular polymers are obtd. in high yields. The prods. have a low fine grain proportion.