Detail of "27858-32-8"

Reference

Foamable organosiloxane compositions

Foamable organosiloxane compositions. Lee, Chi Long; Rabe, James A. (Dow Corning Corp. , USA). U.S. US 4518716 A 21 May 1985, 14 pp. (English). (United States of America). CODEN: USXXAM. CLASS: ICM: C08J009-08. ICS: C08J009-12; C08J009-14. NCL: 521082000. APPLICATION: US 84-665272 26 Oct 1984. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) Moisture-curable, room temp.-vulcanizable polyorganosiloxane foams exhibiting a desirable combination of low d., av. cell size of <4 mm, and cell concn. 34/cm (linear) are obtained by dispensing and curing organosiloxane compns. contg. dispersed liq. or gaseous blowing agent and, as a foam stabilizer, a resinous organosiloxane copolymer contg. trimethylsiloxy units, SiO4/2 units, and F-contg. organosiloxane units. The polymer portion of the organosiloxane compns. can be a polydimethylsiloxane or a graft copolymer comprising at least 20 mol% dimethylsiloxane units in compn. with org. units. Thus, foamable compns. exhibiting viscosity 0.5-500 Pa-s at 25° were prepd. using (1) a mixt. contg. a first OH-terminated poly(dimethylsiloxane) having give viscosity of 2 Pa-s and a 2nd OH-terminated poly(dimethylsiloxane) having give viscosity of 0.08 Pa-s in a wt. ratio of 2:1, resp., (2) (MeO)3SiMe [1185-55-3] crosslinking agent, (3) diisopropoxydiethylacetatotitanium [27858-32-8] crosslinking catalyst, (4) isobutane [75-28-5] blowing agent, (5) 50 wt.% soln. in Me3Si-terminated poly(dimethylsiloxane) foam stabilizer prepd. by reaction of F3C(CF2)nCH2CH2OH with a siloxane contg. SiMe3 and OH groups, and (6) Silgan H-622 [97794-49-5] graft copolymer. The cured foams had skin-over time 3-15 min, tack-free time 5-30 min, d. 0.22-0.55 g/mL, cell size 0.2-4.0 mm, and cell concn. >4/linear cm.

Room-temperature-curable siloxane compositions

Room-temperature-curable siloxane compositions. Kuroiwa, Akihiko; Nanba, Noriyoshi; Kamijo, Terufumi (Toray Silicone Co.Several substances are used for example 75-78-5 and 27858-32-8 which are their cas registry numbers., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 61246756 A2 4 Nov 1986 Showa, 9 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: G03G005-06. ICS: G03G005-04. APPLICATION: JP 85-88370 24 Apr 1985. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) Title compns. having good storage stability in the absence of moisture comprise 100 parts siloxanes having 32 alkoxysilyl groups/mol. and viscosity (25°) 20-1,000,000 cP, 5-50 parts pretreated silica, 0.5-15 parts alkoxysilanes R1nSi(OR2)4-n [R1 = hydrocarbyl; R2 = (alkoxy)hydrocarbyl; n = 0-1] and/or condensates thereof, and 0.1-10 parts Ti chelates as catalysts. Dimethoxy methyl-terminated polydimethylsiloxane, Me2SiCl2-treated silica, MeSi(OMe)3, and diisopropoxybis(Et acetoacetato)titanium were mixed, sealed in an Al tube, stored at 50° for 8 wk, and then cast to form a sheet and cured in contact with air at room temp. for 7 days. The resulting sheet showed JIS A hardness 38 and tensile strength 26 kg/cm2 (38 and 27 kg/cm2 for sheets made from the freshly mixed compn.), vs. 22 and 19 kg/cm2 (32 and 30 kg/cm2) using untreated silica. .