C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5326, 400/72
C08L 83/06 (2006.01) C08G 77/08 (2006.01) C08J 3/03 (2006.01) C08K 5/41 (2006.01) C08K 5/42 (2006.01)
Patent
CA 1276353
EMULSIONS OF REINFORCED POLYDIORGANOSILOXANE LATEX Abstract This invention is a method of producing a latex of crosslinked polydiorganosiloxane rein forced with colloidal silica. The method allows the production of a latex having a relatively high amount of silica present in relation to the polymer because the water used to form the emulsion can be that present in the acidic colloidal silica sol used in the method. The high solids latex can be useful as a caulking material. The method homogenizes a hydroxyl endblocked polydiorganosiloxane, 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 hydrolyzate, 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 greater than 1 part by weight of colloidal silica present as an acidic sol in water. This homogenized mixture is an oil-in-water emulsion. This 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. The product is a latex which produces an elastomer upon removal of the water at room temperature. Shelf stable products are produced by adjusting the pH to from 7 to 12.5.
478984
Huebner David Joel
Saam John Carlton
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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