Solid peroxo compounds and peroxy compounds stabilized by coating
AssigneeSolvay Interox Limited
InventorsRichard Roesler, Manfred Mathes, Gerd Hecken
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Abstract
The stabilization of solid peroxo and peroxy compounds, in particular of sodium percarbonate and acetyl peroxyborate compounds is described, which can be achieved by coating the peroxo and peroxy compounds with a coating material which is a mixture of essentially a) a fatty acid or preferably an alkali metal or alkaline earth metal salt thereof and b) an anionic surfactant from the group of longer chain substituted sulphonates and sulphates.
Claims24
A process for stabilizing solid peroxo or peroxy compounds, said process comprising coating solid particles of the peroxo and peroxy compounds by spraying an aqueous solution or suspension of of a coating material on the particles and drying, wherein the coating material comprises at least 60 %-by weight of a mixture of
- a) an alkali or alkaline earth metal salt of an aliphatic carboxylic acid with 10 to 22 carbon atoms, with
- b) an alkali and alkaline earth metal salt of an anionic surfactant in a weight ratio of a) to b) in the mixture of 1:4 to 4:1, the anion of the surfactant satisfying the general formula I
- R--A--B--SO.sub.3.sup.- I
- wherein
- A represents a bond or an aromatic hydrocarbon group with 6 to 10 carbon atoms, optionally substituted hy SO.sub.3.sup.- groups or or lower alkyl groups,
- B represents a bond or oxygen, and
- R represents an alkyl group with 8 to 18 carbon atoms, and form 0 to 40 %-by weight of other coating materials or adjuvants selected from the group consisting of sodium tripolyphosphate, sodium polycarboxylates, sodium silicates, phosphonic acids and water-soluble magnesium salts.
Stabilized particles of solid peroxo or peroxy compounds coated with a coating material which comprises at least 60 %-by weight of a mixture of a) an alkali or alkaline earth metal salt of an aliphatic carboxylic acid with 10 to 22 carbon atoms, with b) an alkali and alkaline earth metal salt of an anionic surfactant in a weight ratio of a) to b) in the mixture of 1:4 to 4:1, the anion of the surfactant satisfying the general formula I
- R--A--B--SO.sub.3.sup.- I
- where
- A represents a bond or an aromatic hydrocarbon group with 6 to 10 carbon atoms, optionally substituted by SO.sub.3.sup.- groups or lower alkyl groups,
- B represents a bond or oxygen, and
- R represents an alkyl group with 8 to 18 carbon atoms, and 0 to 40%- by weight of other coating materials of adjuvants selected from the group consisting of sodium tripolyphosphate, sodium polycarboxylates, sodium silicates, phosphonic acids and water-soluble magnesium salts.
Dependencies are inferred from the claim text.