Curing of polysulphides

Details Curing of polysulphides Curing of polysulphides

C - Chemistry, Metallurgy

08

G

402/345, 400/810

C08G 75/14 (2006.01) C08L 81/04 (2006.01)

Patent

CA 2024015

2024015 9007539 PCTABS00001 A method of manufacturing a polysulphide polymer, in particular for use as a sealant in the construction industry and the like. A liquid polysulphide prepolymer is partially cured with an oxidizing curing agent such as calcium peroxide, by adding a controlled amount of water. As the cure reaches the end of its induction stage, before the viscosity rises substantially, the reaction is stopped by dehydrating with a desiccant. This gives a stable liquid prepolymer which can later be cured without an induction period by exposure to moisture and optionally a further curative.

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