Preparation of an amino-functional polyorganosiloxane emulsion
AssigneeDow Silicones Corporation
InventorsMark Keinath, Jennifer Reil
Life of this patent
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Abstract
A process is provided for preparing an aqueous emulsion of an amino-functional polyorganosiloxane. The process includes mixing A) an amino-functional polyorganosiloxane, B) a non-ionic surfactant, and C) water; and thereafter mixing in additional starting materials including additional water, D) a water soluble salt, E) a pH adjusting agent, and F) a preservative. A phase inversion occurs during the process, such that the resulting emulsion has A) the amino-functional polyorganosiloxane in the internal, discontinuous phase and C) the water in an external, continuous phase.
Claims17
A process for preparing an emulsion, wherein the process comprises:
- 1) mixing starting materials comprising
- 25 weight parts to 75 weight parts of A) an amino-functional polyorganosiloxane;
- 2 weight parts to 10 weight parts of B) a non-ionic surfactant;
- and
- 4 weight parts to 20 weight parts of C) water;
- 2) mixing, with the product of step 1), a starting material comprising
- 0.02 weight parts to 1 weight parts of D) a water soluble salt, thereby reducing bulk viscosity of the emulsion, and
- additional water;
- and
- 3) mixing starting materials comprising
- E) a pH adjusting agent,
- F) a preservative, and
- optionally G) a freeze inhibitor;
- with the proviso that the emulsion is free of cationic surfactants.
Dependencies are inferred from the claim text.