Organic chlorosilanes are frequently used as coatings for silicon and glass surfaces, and in the production of silicone (polysiloxane) polymers. While phenyl chlorosilanes and many others can be used, methylsiloxanes are produced in the greatest quantities.
Methyl chlorosilanes have one to three methyl groups. In the case of dichlorodimethylsilane, two chlorine atoms are available, so that a reaction with excess water produces a linear chain of ether-like linkages between silicon atoms. As in polyethers, these flexible linkages produce a rubbery polymer, polydimethylsiloxane (PDMS). Trichloromethylsilane can be used to induce branching and cross-linking in PDMS molecules, while chlorotrimethylsilane serves to end backbone chains, limiting molecular weight.
Other acid-forming species, especially acetate, can replace chlorine in silicone synthesis with little difference in the chemistry of the finished polymer. These analogues of chlorosilanes are quite common in the sealants and adhesives marketed to consumers, and as precursors for medical-grade silicone, because of reduced toxicity.
WIPO ASSIGNS PATENT TO DENKI KAGAKU KOGYO FOR "APPARATUS FOR RECOVERING CHLOROSILANE AND METHOD OF RECOVERING CHLOROSILANE WITH THE SAME" (JAPANESE INVENTORS)
Sep 16, 2010; GENEVA, Sept. 22 -- Publication No. WO/2010/103633 was published on Sept. 16. Title of the invention: "APPARATUS FOR RECOVERING...