Equilibration of siloxanes
AssigneeGoldschmidt GmbH
InventorsGeorg Burkhart, Juergen Droese, Horst Dudzik, Klaus-Dieter Klein, Wilfried Knott, Volker Moehring
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Abstract
The invention relates to a process for the preparation of equilibration products of organosiloxanes by rearrangement of the siloxane bond to a cation exchange resin, the organopolysiloxanes thus obtainable and the use thereof.
Claims13
An equilibrated organopolysiloxane obtained by a process comprising reacting at least two organosiloxanes in the presence of a macrocrosslinked polystyrene divinylbenzene based cation exchange resin containing sulfonic acid groups at temperature of about 10° C. to about 120° C., optionally in the presence of a solvent, and isolating the equilibrated organosiloxanes, wherein the said macrocrosslinked cation exchange resin has
- (a) a maximum uniformity coefficient of 1.6;
- (b) a bead size of 16-40 U.S. mesh;
- (c) an effective bead size of 0.50-0.62 mm;
- (d) a fines content of 0.5% based on the weight of the resin;
- (e) a density of 1.15 g/mL;
- (f) a water retention of 57-63%;
- (g) a surface area of about 33 m2/g;
- (h) a pore volume of about 0.45 cm3/g;
- (i) a pore diameter of 41 nm;
- (j) stability over a temperature range of 34-284° F.;
- (k) a maximum storability of 2 years;
- and
- (l) a storability temperature range of 34-104° F.
Dependencies are inferred from the claim text.