Bleaching formulations comprising particles and transition metal ion-containing bleaching catalysts
AssigneeChemsenti Limited
InventorsFabien Pierre Guy Gaulard, Karin Maaijen, Ronald Hage
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Abstract
The present invention relates to bleaching formulations comprising transition metal ion-containing bleaching catalysts, which formulations additionally comprise coated particles having meltable cores that comprise an inorganic solid support material and/or a catalase enzyme; and to the coated particles per se. The invention also relates to uses of the bleaching formulations and the coated particles described herein in methods of bleaching.
Claims20
A bleaching formulation comprising one or more particles and a transition metal ion-containing bleaching catalyst separate from the particles, the particles comprising:
- (i) a core comprising an inorganic solid support material selected from the group consisting of clays, aluminum silicates, silicates, silicas, carbon black and activated carbon, and/or a catalase enzyme or a mimic thereof;
- and an amount of about 0 to about 10 wt % of a transition metal ion-containing bleaching catalyst, the amount of the catalyst being with respect to the weight of the core;
- and
- (ii) a coating encapsulating the core, said coating comprising a material that melts at a temperature of between about 30° C. and about 90° C.,
- with the proviso that, where the inorganic solid support material is talc or a clay, the core does not comprise a peroxy compound or source thereof or a catalase enzyme or mimic thereof, and,
- wherein said core reduce(s), upon melting of said coating, the oxidative propensity of a medium comprising hydrogen peroxide and said bleaching formulation.
A particle comprising:
- (i) a core consisting essentially of an inorganic solid support material selected from the group consisting of clays, aluminum silicates, silicates, silicas, carbon black and activated carbon, and/or a catalase enzyme or a mimic thereof;
- and,
- (ii) a coating encapsulating the core, said coating comprising a material that melts at a temperature of between about 30° C. and about 90° C.,
- with the proviso that, where the inorganic solid support material is talc or a clay, the core does not comprise a peroxy compound or source thereof or a catalase enzyme or mimic thereof;
- and,
- wherein said core reduce(s), upon melting of said coating, the oxidative propensity of a medium comprising hydrogen peroxide and a transition metal ion-containing bleaching catalyst.
A method comprising:
- (a) contacting a substrate with water and a bleaching formulation to form a mixture, and,
- (b) setting temperature of the mixture;
- wherein the bleaching formulation comprises one or more particles and a transition metal ion-containing bleaching catalyst salt separate from the particles, the particles comprising:
- (i) a core comprising an inorganic solid support material selected from the group consisting of clays, aluminum silicates, silicates, silicas, carbon black and activated carbon, and/or a catalase enzyme or a mimic thereof;
- and an amount of about 0 to about 10 wt % of a transition metal ion-containing bleaching catalyst, the amount of the catalyst being with respect to the weight of the core;
- and
- (ii) a coating encapsulating the core, said coating comprising a material that melts at a temperature of between about 30° C. and about 90° C.,
- wherein said core reduce(s), upon melting of said coating, the oxidative propensity of the mixture comprising hydrogen peroxide and said transition metal ion-containing bleaching catalyst, and,
- wherein the temperature of the mixture is set to be no higher than that at which said material of the coating melts.
Dependencies are inferred from the claim text.