Method of producing aqueous latex of crosslinked...

Details Method of producing aqueous latex of crosslinked... Method of producing aqueous latex of crosslinked...

C - Chemistry, Metallurgy

08

G

400/5307, 400/72

C08G 77/08 (2006.01) C08J 3/02 (2006.01) C08J 3/03 (2006.01) C08K 5/41 (2006.01) C08K 5/42 (2006.01) C08L 83/04 (2006.01)

Patent

CA 1277071

METHOD OF PRODUCING AQUEOUS LATEX OF CROSSLINKED POLYDIORGANOSILOXANE Abstract A method of producing an emulsion of crosslinked polydiorganosiloxane admixes hydroxyl endblocked polydi- organosiloxane, alkoxy silicone compound, anionic emulsifying agent, and water. The mixture is homogenized, then the emulsion is admixed with surface active anionic catalyst. Maintaining the catalyzed emulsion, having a pH of less than 5, at room temperature allows the ingredients to react to raise the molecular weight of the polydiorganosiloxane and to crosslink the polymer. The reaction is halted by adding sufficient base to raise the pH to greater than 7. The resultant latex yields an elastomer upon removal of the water. When colloidal silica is also added to the mixture before homogenization, the final latex yields a reinforced elastomer upon removal of the water.

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