Polydiorganosiloxane latex

Details Polydiorganosiloxane latex Polydiorganosiloxane latex

C - Chemistry, Metallurgy

08

G

400/5324, 400/53

C08G 77/06 (2006.01) C08L 83/04 (2006.01)

Patent

CA 1276352

POLYDIORGANOSILOXANE LATEX Abstract This invention is a method of producing an aqueous latex of crosslinked polydiorganosiloxane. The latex yields an elastomer upon removal of the water. The latex is prepared by homogenizing a mixture of hydroxyl endblocked polydiorgano- siloxane; a silane of the formula RaSi(OR3)4-a where R' is a monovalent hydrocarbon radical of up to 12 carbon atoms, R3 is an alkyl radical of 1 to 6 carbon atoms, a partial hydrolyzate, or mixture of silane and hydralyzate, and a is 0 or 1; a surface active anionic catalyst of the formulae R2C6H4SO3H wherein R2 is a monovalent hydrocarbon radical of at least 6 carbon atoms, R2OSO2OH, or Image wherein R4 is H or R2; and water. The resulting emulsion is maintained at a temperature of 15 to 30°C for at least 5 hours at a pH of less than 5 until a crosslinked polymer is formed, then this emulsion is admixed with base to a pH of greater than 7. The resulting emulsion is reinforced by adding greater than 1 part by weight of colloidal silica sol or silsesquiaxane to yield a latex. Removal of water from the latex results in a reinforced elastomer. This method yields a latex which can be applied and dried immediately after mixing to yield an elastomer.

478983

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