Phthalimidoperoxyhexanoic acid particles encapsulated in a water soluble material
View Patent ↗The invention relates to encapsulated bleaching agent particles. Said particles consist of a core that contains a bleaching-agent active ingredient and a coating of water-soluble material that at least partially surrounds said core, the core containing peroxocarboxylic acid and the coating material containing polyvinyl alcohol. The particles can be produced by introducing a particulate peroxocarboxylic acid into a fluidized bed, by spraying an aqueous solution containing polyvinyl alcohol onto said bed and by subsequent drying or spray drying.
1. An encapsulated bleaching agent particle consisting of:
A) a core; and
B) a water-soluble coating material that surrounds this core, wherein the core comprises:
a) phthalimidoperoxyhexanoic acid in particulate form in an amount of 20 wt. % to 90 wt. % of the encapsulated particle; and
b) polyvinyl alcohol, and wherein the coating material comprises:
c) polyvinyl alcohol; and
d) a mineral acid, wherein the bleaching agent particle is a solid particle.
2. The particle according to claim 1 , wherein the proportion by weight of polyvinyl alcohol to acid in the coating material is in a ratio of 1,000:1 to 1:2.
3. The particle according to claim 1 , wherein the core further comprises carrier material in addition to the phthalimidoperoxyhexanoic acid, said carrier material being identical to the coating material.
4. The particle according to claim 1 , wherein coating material comprises 5 wt. % to 50 wt. % of the encapsulated particle.
5. The particle according to claim 1 , wherein the content of phthalimidoperoxyhexanoic acid is 20 wt.% to 50 wt. %.
6. The particle according to claim 1 , wherein the phthalimidoperoxyhexanoic acid is 6-phthalimidoperoxyhexanoic acid.
7. The particle according to claim 6 , wherein the phthalimidoperoxyhexanoic acid is ε-phthalimidoperoxyhexanoic acid.
8. A detergent or cleansing agent comprising bleaching agent particles according to claim 1 .