Compositions – Oxidative bleachant – oxidant containing – or generative – Contains inorganic peroxide
Patent
1990-02-16
1991-06-25
Miller, Edward A.
Compositions
Oxidative bleachant, oxidant containing, or generative
Contains inorganic peroxide
25218638, 25218233, 528374, C08F 2800, C01B 15047
Patent
active
050265040
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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Campbell John S.
Foulkes Michael E.
Cookson Group PLC
Miller Edward A.
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