Reference

Utilization of azeotropic trimethylchlorosilane-tetrachlorosilane mixtures

Utilization of azeotropic trimethylchlorosilane-tetrachlorosilane mixtures. Utkin, O. V.; Uvarova, G. A.; Kolobkov, V. S. 75-78-5 and 75-54-7 are cas registry numbers. These chemicals are also mentioned in this article. (USSR). Khim. Prom-st. (Moscow), (2), 83-4 (Russian) 1984. CODEN: KPRMAW. ISSN: 0023-110X. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Section cross-reference(s): 48 Me3SiCl (I) [75-77-4] was isolated from an azeotropic mixt. comprising I 43, SiCl4 49.5, MeSiCl3 [75-79-6] 5, MeHSiCl2 [75-54-7] 1, Me2SiHCl [1066-35-9] 1, and Me2SiCl2 [75-78-5] 0.5%, by partial etherification of the polyfunctional chlorosilanes with EtOH in a distn. column. The lowest content of undesirable impurities in the distillate with EtOH was used in nearly stoichiometric ratio (without taking I into account). Batch distn. of the etherified mixt. gave I and (EtO)4Si [78-10-4] in >99% purity. I is useful for the manuf. of oligomeric organosilicon compds. .

Process for producing polymerizable silicone oligomers

Process for producing polymerizable silicone oligomers. (Toa Gosei Chemical Industry Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58152022 A2 9 Sep 1983 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G077-00. APPLICATION: JP 82-35113 8 Mar 1982. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Section cross-reference(s): 40, 42 The title process includes (1) treatment of an alkali silicate with acid to give a silicic acid, (2) reaction of the silicic acid with terminal group-modifying agent to give a silicone oligomer having Si-H bonds, and (3) using the oligomer, hydrosilylation with a compd. having radically polymerizable groups and groups which add to the Si-H bonds. The oligomers produced are polymerizable and can modify the surface of paints, films, fibers and inorg. materials to give them water- and oil-repellency, nontackiness, and wear resistance. Thus, reaction of 20 mL 5N H2SO4, 18.1 g Na silicate No.1 (JIS K 1408), 70 mL THF, and 4 g NaCl and then treatment with 1.08 g Me2SiHCl [1066-35-9] and 4.56 g Me3SiCl [75-77-4] gave 6.2 g white silicone oligomer (no.-av. mol. wt. 3250, contg. 2.7 Si-H bonds per 1 mol oligomer), 1.42 g of which in 30 mL PhMe was treated with 0.54 mmol allyl methacrylate [96-05-9] and 0.There are some commonly used reagents with their cas registry numbers 75-77-4 and 999-55-3 in this article.3 mg 2% Pt/carbon to give a white silicone oligomer (no.-av. mol. wt. 3480, contg. 2.4 terminal methacryloyl groups per 1 mol silicone oligomer). .