Method of preparing silicone oil-in-water microemulsions

Details Method of preparing silicone oil-in-water microemulsions Method of preparing silicone oil-in-water microemulsions

1999-01-11

2000-06-06

Lovering, Richard D.

Colloid systems and wetting agents; subcombinations thereof; pro

Continuous liquid or supercritical phase: colloid systems;...

Aqueous continuous liquid phase and discontinuous phase...

424 7012, 424 7024, 424 7028, 514938, 516 67, 524806, B01J 1300, A61K 7075, C08L 4304

Patent

active

060719753

ABSTRACT:
A classical method of microemulsion formation involves mixing an oil and water with a surfactant (S1), and a co-surfactant (S2). The oil is mostly preferably a cyclic siloxane. The oil is added to a solution of the surfactant (S1) and water. A two-phase system containing the siloxane results. The two-phase system is then titrated with co-surfactant (S2) until a clear isotropic microemulsion results. An emulsion polymerization catalyst is added to the clear isotropic microemulsion, and polymerization of the cyclic siloxane is initiated. The polimerization is allowed to advance until the reaction is complete, or desired degree of polymerization (DP) has been obtained. Microemulsions of high molecular weight silicone polymers with low polydispersity can be produced.

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