Bleaching agent
AssigneeEka Chemicals AB
InventorsHans Lagnemo, Monica Jigstam
Life of this patent
Estimating the term…
Abstract
The invention relates to particles having a core comprising a peroxy compound with capability of releasing hydrogen peroxide or peroxy acids in aqueous solutions, which particles have a coating containing a chelating agent selected from alkali metal salts or alkaline earth metal salts of a hydroxy carboxylic acid satisfying the formula: RC.sub.n H.sub.m (OH).sub.n COOH in which R is CH.sub.2 OH or COOH, n is 2-6 and m is 0-n. The invention also relates to preparation and use of the particles, as well as a composition containing such particles.
Claims29
Particles each comprising a core including a peroxy compound capable of releasing hydrogen peroxide or peroxy acids in aqueous solution and a coating over the core containing a chelating agent selected from the group consisting of an alkali metal salt, an alkaline earth metal salt and mixtures thereof of a hydroxycarboxylic acid having the formula
- RC.sub.m H.sub.m (OH).sub.n COOH
- wherein R is CH.sub.2 OH or COOH, n is 4 or 5 and m is 0-n.
A particle comprising a peroxy compound capable of releasing hydrogen peroxide or peroxy acids in aqueous solution and mixed with an alkali metal silicate and a chelating agent selected from the group consisting of an alkali metal salt, an alkaline earth metal salt and mixtures thereof of a hydroxycarboxylic acid having the formula
- RC.sub.n H.sub.m (OH).sub.n COOH
- wherein R is CH.sub.2 OH, n is 2-6 and m is 0-n.
A method for preparing particles comprising mixing a peroxy compound capable of releasing hydrogen peroxide or peroxy acids in aqueous solution, with alkali metal silicate and a chelating agent selected from the group consisting of an alkali metal salt, an alkaline earth metal salt and mixtures thereof of a hydroxycarboxylic acid having the formula
- RC.sub.n H.sub.m (OH).sub.n COOH
- wherein R is CH.sub.2 OH, n is 2-6 and m is 0-n.
Particles each comprising a core including a peroxy compound capable of releasing hydrogen peroxide or peroxy acids in aqueous solution and a coating over the core containing alkali metal silicate and a chelating agent selected from the group consisting of an alkali metal salt, an alkaline earth metal salt and mixtures thereof of a hydroxycarboxylic acid having the formula
- RC.sub.n H.sub.m (OH).sub.n COOH
- wherein R is CH.sub.2 OH or COOH, n is 2-6 and m is 0-n.
Particles each comprising a core including a peroxy compound capable of releasing hydrogen peroxide or peroxy acids in aqueous solution, and a coating over the core containing a chelating agent selected from the group consisting of an alkali metal salt, an alkaline earth metal salt and mixtures thereof of a hydroxycarboxylic acid having the formula
- RC.sub.n H.sub.m (OH).sub.n COOH
- wherein R is CH.sub.2 OH, n is 2-6 and m is 0-n.
A method for preparing a particle comprising applying a coating over a core, the core comprising a peroxy compound having the capability of releasing hydrogen peroxide in aqueous solutions, the coating containing a chelating agent selected from the group consisting of an alkali metal salt, an alkaline earth metal salt and mixtures thereof of a hydroxycarboxylic acid having the formula
- RC.sub.n H.sub.m (OH).sub.n COOH
- wherein R is CH.sub.2 OH, n is 2-6 and m is 0-n.
Particles comprising mixture of a a peroxy compound capable of releasing hydrogen peroxide or peroxy acids in aqueous solutions, with alkali metal silicate and a chelating agent selected from the group consisting of an alkali metal salt, an alkaline earth metal salt and mixtures thereof of a hydroxycarboxylic acid having the formula
- RC.sub.n H.sub.m (OH).sub.n COOH
- wherein R is CH.sub.2 OH or COOH, n is 4 or 5 and m is 0-n.
A method for preparing particles comprising mixing a peroxy compound capable of releasing hydrogen peroxide or peroxy acids in aqueous solution, with alkali metal silicate and a chelating agent selected from the group consisting of alkali metal salts, alkaline earth metal salts and mixtures thereof, of a hydroxycarboxylic acid having the formula
- RC.sub.n H.sub.m (OH).sub.n COOH
- wherein R is CH.sub.2 OH or COOH, n is 4 or 5 and m is 0-n.
A method for preparing a particle comprising applying a coating over a core, the core comprising a peroxy compound having the capability of releasing hydrogen peroxide in aqueous solutions, the coating containing alkali metal silicate and a chelating agent selected from the group consisting of an alkali metal salt, an alkaline earth metal salt and mixtures thereof of a hydroxycarboxylic acid having the formula
- RC.sub.n H.sub.m (OH).sub.n NCOOH
- wherein R is CH.sub.2 OH or COOH, n is 2-6 and m is 0-n.
A method for preparing a particle comprising applying a coating over a core, the core comprising a peroxy compound having the capability of releasing hydrogen peroxide in aqueous solutions, the coating containing a chelating agent selected from the group consisting of an alkali metal salt, an alkaline earth metal salt and mixtures thereof of a hydroxycarboxylic acid having the formula
- RC.sub.n H.sub.m (OH).sub.n COOH
- wherein R is CH.sub.2 OH or COOH, n is 4 or 5 and m is 0-n.
Dependencies are inferred from the claim text.