| abstract |
1,244,966. Iodine-containing organo-silicon compounds. GENERAL ELECTRIC CO. 4 Sept., 1968 [11 Sept., 1967], No. 42141/68. Headings C3S and C3T. [Also in Division C5] Silanes and siloxanes containing Si-bonded ethyl groups substituted by I atoms and Br or Cl atoms and hydroxy, alkoxy or acyloxy groups are prepared by reaction of the corresponding vinyl silanes or siloxanes with IBr or ICl (or I 2 /Cl 2 or I 2 /Br mixtures) and water or an alkanol or alicyclic ether or a carboxylic acid. The hydroxy group is introduced by adding water to the product of reaction with iodine halide in CCl 4 , CCl 2 =CHCl or CCl 2 = CCl 2 ; the alkoxy or acyloxy groups are introduced by using a solution of the halide in the alcohol, ether or acid. The products fall within the following formulµ, even when considerable excesses of halide and HOR are used wherein X is Br or Cl, R is H or a C 1-7 alkyl or acyl group, R<SP>1</SP> is a monovalent hydrocarbon or halohydrocarbon radical, a+b= 1, a=b+c, c+d=1, d=0À06 to 0À16, e=0À05 to 1,f=1 to 2 and e+f= 2 to 3. They may be used to improve the lubricating properties of hydrocarbon and silicone oils. Such compositions may also include light-absorbent dyes and free radical absorbers, e.g. isoprene, d-limonene, and α- methylstyrene, solvents, and grease-forming fillers, e.g. silica gel, carbon black, diatomaceous earth and graphite. In examples, sym-tetravinyl tetramethyl tetrasiloxane or vinyl trimethylsilane or sym-divinyl tetramethyl disiloxane is added to a mixture of I 2 and Br 2 in acetic acid or ethanol, or ICI in acetic acid, or to Br 2 and I 2 in CCl 4 , followed by washing with water to give products: These are dissolved in naphthenic mineral oil or a dimethylsiloxane oil, optionally with dlimonene and a blue dye, to give lubricant compositions. |