Reference

Alkyl(aryl)hydrosilanes, -siloxanes, and -silazanes in reactions with tetraalkoxytitaniums

Alkyl(aryl)hydrosilanes, -siloxanes, and -silazanes in reactions with tetraalkoxytitaniums. Anpilogova, A. I.; Vakhrameeva, N. V.; Maksakova, M. A.; Sidorov, V. I. (USSR). Zh. Prikl. Khim. (Leningrad), 51(3), 658-61 (Russian) 1978. CODEN: ZPKHAB. ISSN: 0044-4618. DOCUMENT TYPE: Journal CA Section: 41 (Leather and Related Materials) Section cross-reference(s): 49 Ti(OBu)4 (I) [5593-70-4] reacts both with collagens and Si compds. used to waterproof leather. Leather pretreated with I reacts with AcOSiMe3 [2754-27-0], poly(hydromethylsilazane), or GKZh 94 at 120-30° without any catalyst to give films contg. chem. combined Si. The reactivity of I towards Si compds.Several reagents such as 5593-70-4 is used here. decreases in the order MeOSiMe3 [1825-61-2] > 1,1,3,3-tetramethyldisilazane [15933-59-2] > pentamethyldisiloxane [1438-82-0] > Me2PhSiH [766-77-8] ? Et3SiH [617-86-7]. Other reactive Si compds. include 3-hydroheptamethyltrisiloxane [1873-88-7]. Ti(OEt)4 [3087-36-3] is more reactive than I, e.g. Et3SiH reacts with it at 120-30° giving 11% Et3SiOEt [597-67-1] in 10 h, but there is no corresponding reaction with I. .

4-Methyl-1-pentene polymer or copolymer

4-Methyl-1-pentene polymer or copolymer. Kashiwa, Norio; Fukui, Kunisuke (Mitsui Petrochemical Industries, Ltd. , Japan). Eur. Pat. Appl. EP 125910 A1 21 Nov 1984, 28 pp. DESIGNATED STATES: R: AT, DE, FR, GB, IT, NL. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C08F010-14; C08F004-64. APPLICATION: EP 84-303227 11 May 1984. PRIORITY: JP 83-80936 11 May 1983. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) High stereoregularity and catalyst activity in the homopolymn. of 4-methyl-1-pentene (I) or copolymn. of I with ￡20 mol% C2-20 olefin are achieved by using a catalyst comprising (a) a highly active solid Ti catalyst component composed of Mg, Ti, halogen, and a carboxylic acid diester, (b) an organoaluminum compd., and (c) an organosilicon compd. R1R2R3SiOR4 (R1-R4 = C1-5 hydrocarbyl), whereby I is prepolymd. or precopolymd. in the presence of a catalyst comprising a, a portion of the b compd., and a part of the c compd. to give 1-1000 g polymer/mmol Ti. Thus, a solid catalyst component contg. 3.1% Ti was prepd. by treating TiCl4 with a soln. contg. anhyd. MgCl 50, 2-ethylhexyl alc. [104-76-7] 150, and phthalic anhydride [85-44-9] 7.5 mmol. and then with 12.5 mmol diisobutyl phthalate [84-69-5] at 110°. The solid component obtained was added (1 mmol, calcd. as Ti) along with 200 mL n-decane, 10 mmol Et3Al [97-93-8], and 2 mmol Me3SiOMe (II) [1825-61-2] to a reaction flask. I (30 g) was added at 25° over 1 h, and the mixt. held at 25° for 30 min. The amt. of I prepolymd. was 30 g/mmol Ti. Then, a mixt. of 500 mL I, 0.5 mmol Et3Al, 0.05 mmol II, 0.0025 mmol (calcd. as Ti) prepolymn. product, and 250 mL H was polymd. at 50° for 30 min to give a white, powdery polymer [25068-26-2] with stereoregularity index (boiling heptane-insol. fraction, cased on total polymer) 98.2% and bulk d. 0.40 g/mL at productivity 24,000 g polymer/mmol Ti, compared with 96.5%, 0.31 g/mL, and 11,000 g polymer/mmol Ti, resp., when the polymer was prepd. without prepolymn.