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US 8,969,502 B2Granted
Process for preparing polydimethylsiloxanes on sulphonic acid cation exchange resins
AssigneeEvonik Degussa GmbH
InventorsWilfried Knott, Martin Glos, Norbert Nilewski
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Abstract
The invention relates to a process for the targeted reorganization of polydimethylsiloxanes over sulphonic acid-containing cation exchange resins which have water contents of 8 to 25% by weight, and polydimethylsiloxanes thus prepared and the use thereof.
Claims8
A composition containing different polydimethylsiloxanes of formula (1)
- having a chain length N=n+2, wherein the sum of polydimethylsiloxanes with N=6 and N=7 is ≧20% by weight, and the sum of polydimethylsiloxanes having a boiling point lower than the boiling point of a polydimethylsiloxane with N=6 is less than 5% by weight, wherein said % by weight is based on the mass of the polydimethylsiloxanes of formula (1).
Dependencies are inferred from the claim text.