C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
402/26, 400/7218
C07F 7/18 (2006.01) C08G 77/06 (2006.01) C08G 77/392 (2006.01) C08G 77/50 (2006.01) C08L 83/14 (2006.01)
Patent
CA 1155864
ABSTRACT Novel sulfur-containing organopolysiloxanes consisting essentially of a combination of units selected from dimethyl-siloxane units, trimethylsiloxane units, sulfur-containing siloxane units of the formula Image and pendent sulfur-containing siloxane units of the formula Image wherein: R and R1 are the same of different and selected from the group consisting of methyl and ethyl; x has a value of 2 or 3; a has a value of 0 or 1; A and B are the same or different and selected from among the group consisting of divalent radicals of the formulas -CmH2m- and -CnH2n- wherein: m and n are the same or different and have a value of from 2 to 4 inclusive, and trivalent radicals having the formula Image forming a silacyclopentamer by attachment of the (+) bond to a sulfur atom and the other two bonds to the same silicon atom; R2 is a monovalent radical selected from the group consisting of alkyl and alkoxy radicals having from 1 to 3 carbon atoms inclusive and phenyl radical; b has a value of 1 or 2; R3 is a methyl or ethyl; c has a value of 0 or 1; provided that (1) in the divalent radical, no carbon atom is attached to both a silicon atom and a sulfur atom; (2) when A is a trivalent radical, x is 2 and a is 0; (3) when B is a trivalent radical, b is 1 and c is 0; and (4) when B is a divalent radical, b is 2 and c is 1; said organopolysiloxane containing an average of at least two sulfur-containing siloxane units per molecule and no more than 10 mole percent pendent sulfur-containing siloxane units based on the total number of siloxane units in the organopolysiloxane. Mixtures of such sulfur-containing organopolysiloxanes with a suitable catalyst provide useful compositions curable to elastomers at room temperature.
364878
Homan Gary R.
Lee Chi-Long
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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