| 摘要 |
Molecular distillation of methyl alkyl siloxanes of the formula <IMAGE> wherein R1 and R2 are alkyl groups of 4-20 carbon atoms and m and p are integers to produce a distillate having a molecular weight fraction wherein the sum of m and p becomes about 4, produces an improved lubricant for a video disc. A video information record is coated with a lubricant which is a methyl alkyl siloxane of formula <IMAGE> where R1 and R2 are as above, x is 2-4, z is 0-2 and x + y = 4 or less. |
