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US 8,575,266 B2Granted
Preparing silicone emulsions
AssigneeWacker Chemie AG
InventorsChristof Brehm, Robert Schroeck
Life of this patent
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Abstract
The invention provides a process for preparing emulsions of organopolysiloxanes (O), which includes polymerizing: (1) 100 parts by weight of hydroxyl-terminated organopolysiloxanes and (2) at least 0.01 part by weight of trialkylsilyl-terminated organopolysiloxanes having a viscosity of at least 55 mm2/s in the presence of (3) acidic catalyst and (4) emulsifier in an aqueous medium until the desired molecular size is reached.
Claims10
A process for preparing emulsions of organopolysiloxanes, which comprises polymerizing
- (1) 100 parts by weight of hydroxyl-terminated organopolysiloxanes and
- (2) at least 0.01 part by weight of trialkylsilyl-terminated organopolysiloxanes having a viscosity of at least 55 mm2/s
- in the presence of
- (3) acidic catalyst and
- (4) emulsifier
- in an aqueous medium until a desired molecular size is reached,
- wherein the acidic catalyst comprises surface-active acidic polymerization catalysts selected from the group consisting of sulphonic acids, hydrogensulphates and mono- and diesters of phosphoric acid.
4 more elements
Dependencies are inferred from the claim text.