| 摘要 |
1282580 Polymerizing butadiene ESSO RESEARCH & ENG CO 16 Dec 1969 [3 Jan 1969] 61230/69 Heading C3P Polymerization catalyst systems comprising TiX 3 .nAlI 3 , an organoaluminium compound, and a Lewis base, wherein X is halogen and n is a number from 1-20, can be used to polymerized butadiene. The Lewis base may be tetrahydrothiophene, tetrahydrothiopyran, or tetrahydrofuran, and may be added to the polymerization system either simultaneously with or after the addition of the organoaluminium compound. Polybutadienes having randomly distributed cis and trans unsaturation in the range of 50-90% trans and having a viscosity average molecular weight in excess of 100,000 and having (a) in the uncross-linked state tensile strengths of 150-2000 p,s.i., an extensibility before break of up to 1310% and a permanent set after breaking of 25-300%, and (b) in the cross-linked state tensile strengths of 1200-2500 p.s.i. and an extensibility before break of up to 900% may be produced. In the examples: (a) butadiene is polymerized in benzene utilizing TiCl 3 .n.AlI 3 , wherein n is 3/5 or 10, Al(C 2 H 5 ) 3 and tetrahydrothiophene or tetrahydrothiopyran; and (b) butadiene is polymerized in benzene utilizing TiCl 3 .5AlI 3 , Al(iso-C 4 H 9 ) 3 and tetrahydrothiophene. |
