Encapsulated bleach particles with at least two coating layers having different melting points
AssigneeEcolab Inc.
InventorKeith E. Olson
Life of this patent
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Abstract
High efficiency encapsulation of core particles, particularly halogen bleaches, by (i) encapsulating the core particle in at least two separate coats wherein the melting point of the inner or first coating material is below the melting point of the outer or second coating material, (ii) heating the thus encapsulated particle to a temperature between the melting points of the inner and outer coating materials in order to liquefy the inner coat, and (iii) allowing the liquid inner coat to solidfy and form a continuous, nonporous encapsulating coating.
Claims10
An encapsulated particle comprising a coated particle having (i) a bleach core particle, (ii) an inner, heat-treated coating of a first coating material, and (iii) an outer coating of a second coating material;
- the first coating material having a melting point lower than the melting point of the second coating material and the inner coating heat-treated by intentionally heating the coated particle to a temperature above the melting point of the first coating material but below the melting point of the second coating material so as to substantially liquefy the inner coat.
Dependencies are inferred from the claim text.