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Coated sodium percarbonate particles, a process for their production and detergent, cleaning and bleaching compositions containing them

TLDR
Sodium percarbonate is often used in the form of coated particles to increase its storage stability in detergents as mentioned in this paper, where perborax with the formula Na 2 B 4 O 7 ·H 2 O 2, where n = 2 or 4.
Abstract
Sodium percarbonate is often used in the form of coated particles to increase its storage stability in detergents. Sodium percarbonate particles coated in accordance with the invention have a coating containing reaction products from the reaction of a dialkali metal tetraborate or alkali metal pentaborate with aqueous hydrogen peroxide. Preferred coating components are: perborax with the formula Na 2 B 4 O 7 ·H 2 O 2 , where n =2 or 4. The coated sodium percarbonate particles are produced by coating the percarbonate particles using a solution containing the reaction products mentioned above. Detergent, bleaching and cleaning compositions containing sodium percarbonate particles coated in accordance with the invention are distinguished by very high stability in storage.

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References
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Patent

Sodium percarbonate particles (A)

TL;DR: In this article, the authors describe prepared sodium percarbonate particles consisting essentially of a sodium per-carbonate nucleus encased in a layer of sodium silicate and/or sodium tripolyphosphate.
Patent

Stable sodium percarbonate particle and process for preparing same

TL;DR: In this article, a stable sodium percarbonate particle that at least the inside of the particle is penetrated and coated with a borate and a process for preparing the same are disclosed.
Patent

Sodium percarbonate bleaching agents

TL;DR: Bleaching agents contg. Na percarbonate (I) coated with a borate-contg. (II) are claimed as mentioned in this paper, and the amt. of (II may be 0.1-30% of the wt.
Patent

Sodium percarbonate particles coated with dehydrated sodium perborate - useful as storage stable bleaching agent

TL;DR: Sodium percarbonate particles comprise a core of sodium percarborate coated with dehydrated sodium perborate (corresp. to formula NaBO2H2O2).