Emulsions of Boron Crosslinked Organopolysiloxanes
AssigneeDow Corning Corporation
InventorsSeverine Cauvin, Glenn Gordon, Bethany Johnson, Donald Liles
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Abstract
A process is disclosed for preparing an emulsion composition by forming a mixture of a silanol functional organopolysiloxane, a boron compound, an emulsifier, and then admixing water to the mixture to form an emulsion. The resulting emulsions are useful for providing a coating of a high viscosity or dilatant silicone.
Claims15
A process for preparing an emulsion composition comprising:
- I) forming a mixture of;
- A) a silanol functional organopolysiloxane,
- B) a boron compound,
- C) an emulsifier,
- II) admixing water to the mixture from step I) to form an emulsion,
- III) optionally, further shear mixing the emulsion.
The process according to any one of the above claims wherein the emulsion is a water continuous emulsion having a dispersed phase comprising a boron crosslinked organopolysiloxane.
The process according to any one of the above claims wherein the organopolysiloxane is a silanol terminated polydimethylsiloxane.
The process according to any one of the above claims wherein the boron compound is dispersed in a trimethylsiloxy terminated polydimethylsiloxane.
The process according to any one of the above claims wherein the boron compound is B2O3 or H3BO3.
The process according to any one of the above claims wherein the emulsifier is a mixture of nonionic surfactants.
The process according to any one of the above claims wherein the nonionic surfactants have a combined HLB value of 8-15.
The process according to any one of the above claims wherein the nonionic surfactant mixture comprises an ethoxylated C10-Guerbet alcohol or an ethoxylated iso-C13 alcohol.
The process according to any one of the above claims wherein the water is added in incremental portion such that each portion is less than 30 weight % of the mixture from step I.
Dependencies are inferred from the claim text.