Process for recycling cured polysulfide sealants
AssigneeMorton International, Inc.
InventorsMichael J. Hallisy, John R. Gilmore, Steven J. Hobbs, Warren G. Duncan
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Abstract
Solid waste materials comprising oxidatively-cured, solid polysulfide sealants containing spent oxidant, fillers, plasticizers, and other formulating aids are reverted to a liquid sealant comprising mercaptan-terminated polysulfides by reducing them with a liquid mercaptan-terminated polysulfide at temperatures ranging from about 50.degree. to about 110.degree. C. Upon the addition of fresh curing agent and recuring, the reclaimed sealant has satisfactory tensile strength and elongation properties.
Claims5
A method for reclaiming a cured polysulfide sealant comprising mixing the sealant in a non-aqueous system at a temperature of from about 50.degree. C. to about 100.degree. C. with an amount of a mercapto-group terminated liquid polysulfide sufficient to provide from about 1.0% to about 3% by weight of mercapto groups in the reclaimed sealant.
Dependencies are inferred from the claim text.