Detail of "100-99-2"

Reference

Conjugated diene rubbers

Conjugated diene rubbers. (Asahi Chemical Industry Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 60108408 A2 13 Jun 1985 Showa, 10 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: ICM: C08F036-06. ICS: C08F004-52; C08F004-54; C08F004-58. APPLICATION: JP 83-214128 16 Nov 1983. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) Section cross-reference(s): 67 Conjugated diene monomer is polymd. using salts of rare earth metals with PhOH, naphthol, thiophenol or thionaphthol, org. Al compd., and halogen-contg. Lewis acids to give conjugated diene rubber with narrow mol. wt. distribution and excellent elasticity. Thus, 400 g hexane contg. 60 g 1,3-butadiene was mixed in an N atm. at 23° for 15 min. with 0.12 mmol Nd p-nonylphenolate [98204-40-1] and 3.6 mmol Al(iso-Bu)3 [100-99-2], polymd. at 65° for 1 h with 0.28 mmol ethylaluminum sesquichloride [1321-67-1]; the reaction was stopped by adding 10% methanolic soln. of 2,6-bis(tert-butyl)-4-methylphenol, a large amt. of MeOH was added, and the ppt. was dried in vacuo to give butadiene rubber.

Alternating copolymerization of isoprene with ethylene in the presence of the catalytic system titanium tetrachloride-electron donor compound-AlR3

Alternating copolymerization of isoprene with ethylene in the presence of the catalytic system titanium tetrachloride-electron donor compound-AlR3. Myagkova, L. A.; Kropacheva, E. N. (USSR). Vysokomol. Soedin., Ser. A, 27(1), 41-5 (Russian) 1985. CODEN: VYSAAF. ISSN: 0507-5475. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) The content of the C2-C5 diads and microstructure of ethylene-isoprene copolymers (I) [26587-33-7] prepd. in the presence of TiCl4-electron donor- iso-Bu3Al [100-99-2] catalysts depended primarily on the Al-Ti ratio (R). At R = 1, only polyisoprene was formed. I were formed at R 33. An increase in R from 3 to 15 increased the content of the C2-C5 diads in I with accompanying increase of the 3,4-bonds in the diads at the expense of the 1,4-trans bonds. Further increase in R had no effect on microstructure of the isoprene units. The rate of the copolymn. was max. at R = 15. An increase in the content of ethylene in reaction mixt. at R = 15 increased the reaction rate and at R = 5, decreased it. The rate of copolymn. depended on the nature of the electron donor and decreased in the sequence AcPh [98-86-2] > B3Ph [119-61-9] > AcMe [67-64-1].