Siloxane mixtures
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United States of America Patent
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Jan 9, 2018
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app pub date -
Jun 11, 2013
filing date -
Jun 29, 2012
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Abstract
The invention provides mixtures, liquid at 25° C., of methylpolysiloxanes comprising at least two methylpolysiloxanes selected from linear compounds of the general formula I Me3SiO-(Me2SiO)x-SiMe3 (I), and cyclic compounds of the general formula II (Me2SiO)y (II), wherein the mixture comprises at least one linear methylpolysiloxane of the general formula I and at least one cyclic methylpolysiloxane of the general formula II, Me means methyl radical, x has values greater than or equal to zero and the arithmetic mean of x, weighted by the molar proportions, over all linear methylpolysiloxanes is between 3 and 20, y has values greater than or equal to 3 and the arithmetic mean of y, weighted by the molar proportions, over all cyclic methylpolysiloxanes is between 3 and 6, the numerical ratio of the Me3Si— chain ends groups in the compounds of the general formula I to the sum of the Me2SiO— units in the compounds of the general formulae I and II is at least 1:2 and at most 1:10, and further definitions are described in claim 1, and the use of the mixtures as heat carrier fluids.
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