Curing of polysulphides
AssigneeMorton International, Inc.
InventorsTimothy C. P. Lee, George B. Lowe, Raymond Robinson
Life of this patent
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Abstract
A process for the manufacture of a partially cured polysulphide composition is provided, the curing of which is completed upon exposure of the composition to atmospheric moisture. The process comprises mixing a prepolymer with a water activatable curing agent and subjecting the composition to a partial cure with water. The reaction is then stopped by rapid dehydration after the initial induction stage of the reaction prior to the rapid increase in the viscosity of the composition. Curing of the composition is then completed by exposing the composition to atmospheric moisture.
Claims10
A method of curing a polysulphide composition, said cure comprises an induction stage, a chain extension stage, and a final cure stage, wherein a prepolymer having free mercaptan groups is mixed with a water activatable curing agent, wherein the composition is subjected to a partial cure with water, the reaction then being stopped by dehydration.
Dependencies are inferred from the claim text.