Curing composition for polysulphide polymers
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United States of America Patent
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Jun 25, 1991
Issued Date -
N/A
app pub date -
Feb 16, 1990
filing date -
May 23, 1986
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Expired
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Abstract
A curing composition for curing a polysulphide polymer, which composition comprises as the curing agent sodium birnessite, Na.sub.4 Mn.sub.14 O.sub.27.9H.sub.2 O. A process for the preparation of sodium birnessite comprises the steps of adding excess in the range of from 25% to 225% of a solution of sodium hydroxide to a solution of manganese (II) chloride or manganese (II) sulphate to form a slurry of manganese (II) hydroxide and passing air free of carbon dioxide therethrough for at least 3 hours or oxygen for 1.5 hours, these steps being carried out at ambient temperature.
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