Oxidizing agents sodium percarbonate

Oxidizing agents such as sodium perborate and sodium percarbonate have also been used in cleaning contact lenses. None of these products are currently marketed for that purpose in the United States. Products marketed earlier were withdrawn because of their deleterious effects on lens polymers. 

Practically all leuco compounds of vat dyes will oxidize on exposure to air but the reaction often takes 30 to 45 minutes to complete. When the goods are in an open state and air has access to every part, atmospheric oxidation does not present much difficulty. When the material is in a dense mass such as a tightly-wound roll or a cheese or cone of yarn, the penetration of air to the innermost portions may be slow and in such cases treatment with an oxidizing agent is of assistance. The goods can be rinsed with cold water and then treated for 10 to 20 minutes at 30° to 40°C (86° to 104°F) in a liquor containing 1 to 2 parts per 1000 of potassium dichromate and 2 5 to 10 parts of 30 per cent acetic acid. More frequently the oxidation is carried out at 40° to 50°C (104° to 122°F) in a solution containing 3 parts of sodium percarbonate or 2 parts of sodium perborate per 1000, followed by a rinse and treatment with dilute acetic acid (6 to 10 parts of 30 per cent acid per 1000) to neutralize the alkali derived from the per-salt. 

Several other oxidizing agents can be made from hydrogen peroxide and thus be derived indirectly from oxygen. These include sodium perborate, sodium percarbonate, urea peroxide, peracids, potassium peroxymonosulfate, amine oxides, dioxiranes, and iodosobenzene (4.24). 

Oxidations. Alcohols are oxidized in dichloroethane with catalytic amounts of a dichromate salt using sodium percarbonate as a recycling agent and PTC. - Epoxidations of enones by sodium perborate or NaOCP under PTC conditions give high yields. However, with NaOCl and hexaethylguanidinium chloride, cyclohexenones give 6,6-dichloro-2,3-epoxycyclohexanones. 

Chlorine is the basis for the most commonly used bleaches, for example the solution of sodium hypochlorite, which is so ubiquitous that many people just call it bleach, and calcium hypochlorite. Oxidizing bleaching agents that do not contain chlorine are often based on peroxides, such as hydrogen peroxide, sodium percarbonate, and sodium perborate. 

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