Detail of "3901-77-7"

Reference

Crosslinking of hydrogen silicone elastomers with unsaturated organosilicon compounds by hydrosilylation

Crosslinking of hydrogen silicone elastomers with unsaturated organosilicon compounds by hydrosilylation. Gorshkov, A. V.; Kopylov, V. M.; Dontsov, A. A.; Khazen, L. Z. (USSR). Kauch. Rezina, (9), 5-7 (Russian) 1986. CODEN: KCRZAE. ISSN: 0022-9466. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Di-Me, Me hydrogen and di-Me, Me hydrogen, Me vinyl silicone rubbers (GSE-1 and -2, resp.) were vulcanized with or without vinyl group-contg. cyclosiloxanes, 1,3,5-trimethyl-1,3,5-trivinylcyclotrisilazane [5505-72-6], or linear siloxanes as vulcanizing agents in the presence of Pt bis(benzyltrioctylammonium) tetranitrite (I) [96109-38-5] at elevated temps. in air or under pressure. The crosslink d. increased with increasing concn. of I, cure temp., and time with or without vulcanizing agents; was higher in air than under pressure; and depended on Si substituents of vulcanizing agents, decreasing in the order: di-Me, Me vinyl siloxane > Me Ph, Me vinyl siloxane > di-Ph, Me vinyl siloxane. The crosslink d. of GSE-2 was substantially higher than that of GSE-1 under the same conditions. The highest rate of crosslinking was achieved with cyclosiloxane vulcanizing agents, such as 1,3,5-trimethyl-1,3,5-trivinylcyclotrisiloxane [3901-77-7]. The degree of vulcanization in air increased on filling with colloidal SiO2 (Aerosil A-300) and was optimum with respect to physicomech. properties of vulcanizates when carried out at 200° for 60 and 120 min for GSE-1 and GSE-2, resp. The vulcanization in air proceeded via both hydrosilylation and oxidn. of HSi groups, followed by dehydrocondensation of SiOH groups.

Siloxanes and their manufacturing methods and compositions

Siloxanes and their manufacturing methods and compositions. Hida, Yoshiisa; Kosakai, Shohei (Shin-Etsu Chemical Industry Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 62000533 A2 6 Jan 1987 Showa, 18 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: C08G077-20. ICS: C08G077-06; C08L083-04. APPLICATION: JP 85-139743 26 Jun 1985. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Polymers having good mech. strength are prepd. 3901-77-7 and 1066-40-6 which are cas registry numbers of chemicals are mentioned. by hardening R3aR4bSiO(SiR1R2O)m(SiR5R6O)n(SiR1R2O)mSiR3aR4b (R1 = C2-4 alkenyl; R2, R3 = R1 or same or different (substituted) univalent hydrocarbyl groups; R4, R5, R6 = same or different (substituted) univalent hydrocarbyl groups; 0 ￡ a ￡ 3; 0 ￡ b ￡ 3; a + b = 3; m > 3; n > 6). Thus, Me3Si(OSiMeCH:CH2)9(OSiMe2)400(OSiMeCH:CH2)9OSiMe3 was prepd., mixed with an organo H polysiloxane and a platinic chloride soln., and hardened by UV. .