Encapsulated bleach composition and method of preparation

Claim 2

A fabric bleach composition which minimizes localized attack on fabrics and dyes by available halogen comprising particles of a halogen bleaching agent having at least one N-halo atom capable of releasing a hypohalite ion to an aqueous solution, said particles coated with sufficient soluble, hydrated silicate-bound inorganic salt selected from the group consisting of sodium carbonate, trisodium phosphate, disodium phosphate, sodium sulfate, and condensed polyphosphates in admixture with a soluble alkali metal salt of boric acid, whereby ratio of the N-halo atoms to the boron atoms in the composition ranges from about 0.5:1 to about 10:1.

Claim 3

The composition of claim 1 wherein the halogen bleaching agent is an isocyanurate bleaching agent having at least one N-halo atom capable of releasing a hypohalite ion.

Claim 4

The composition of claim 1 wherein the halogen bleaching agent is a chlorinated cyanurate salt or hydrated salt.

Claim 5

The composition of claim 1 wherein the halogen bleaching agent is sodium dichloroisocyanurate or a hydrate thereof.

Claim 6

The composition of claim 1 where the alkali metal salt of boric acid is a sodium polyborate.

Claim 7

The composition of claim 1 wherein the alkali metal salt of boric acid is selected from the group consisting of disodium tetraborate pentahydrate, disodium tetraborate tetrahydrate, sodium pentaborate pentahydrate, sodium metaborate tetrahydrate, sodium metaborate dihydrate, disodium octaborate tetrahydrate, and mixtures thereof.

Claim 8

The composition of claim 4 wherein the alkali metal salt is selected from the group consisting of disodium tetraborate pentahydrate, disodium tetraborate tetrahydrate, sodium pentaborate pentahydrate, sodium metaborate tetrahydrate, sodium metaborate dihydrate, disodium octaborate tetrahydrate, and mixtures thereof.

Claim 9

The process of preparing a stable halogen bleach system providing minimized local fabric attack comprising: (a) forming a dry mix consisting essentially of an H-halo bleaching agent, soluble hydratable inorganic salt selected from the group consisting of sodium carbonate, trisodium phosphate, disodium phosphate, sodium sulfate, and condensed polyphosphates, and sufficient alkali metal salt of boric acid whereby the mol ratio of N-halo atoms to boron atoms in the composition is between 0.5:1 and 10:1, (b) adding with agitation to said dry mix an aqueous solution of an alkali metal silicate to induce agglomeration thereby producing particles of N-halo bleaching agent coated with a layer containing both a soluble, hydrated silicate bound inorganic salt and an alkali metal salt of boric acid, (c) drying the particles from step (b).

Claim 10

The process of preparing a stable halogen bleach system providing minimized local fabric attack comprising: (a) forming a dry mix consisting essentially of an H-halo bleaching agent, soluble hydratable inorganic salt selected from the group consisting of sodium carbonate, trisodium phosphate, disodium phosphate, sodium sulfate, and condensed polyphosphates, and sufficient alkali metal salt of boric acid whereby the mol ratio of N-halo atoms to boron atoms in the composition is between 0.5:1 and 10:1, (b) adding with agitation to said dry mix an aqueous solution of an alkali metal silicate to induce agglomeration thereby producing particles of N-halo bleaching agent coated with a layer containing both a soluble, hydrated silicate bound inorganic salt and an alkali metal salt of boric acid, (c) drying the particles from step (b).

Claim 11

The process of claim 8 in which a second coating is applied to the N-halo bleaching agent by forming a second dry mix of the particles from claim 8 and adding with agitation to said dry mix an aqueous solution of an alkali metal silicate thereby producing further silicate binding of the soluble, hydrated, inorganic salt and the alkali metal salt of boric acid, and drying the particles.

Claim 12

The process of claim 8 wherein the N-halo bleaching agent is a chlorinated cyanurate salt or hydrate thereof.

Claim 13

The process of claim 8 wherein the N-halo bleaching agent is sodium dichloroisocyanurate or hydrate thereof.

Claim 14

The process of claim 8 wherein the alkali metal salt of boric acid is a sodium polyborate.

Claim 15

The process of claim 8 wherein the alkali metal salt is selected from the group consisting of disodium tetraborate pentahydrate, disodium tetraborate tetrahydrate, sodium pentaborate pentahydrate, sodium metaborate tetrahydrate, sodium metaborate dihydrate, disodium octaborate tetrahydrate, and mixtures thereof.

Claim 16

The process of claim 9 wherein the N-halo bleaching agent is a chlorinated cyanurate salt or a hydrate thereof.

Claim 17

The process of claim 9 wherein the N-halo bleaching agent is sodium dichloroisocyanurate or hydrate thereof.

Claim 18

The process of claim 9 wherein the alkali metal salt is selected from the group consisting of disodium tetraborate pentahydrate, disodium tetraborate tetrahydrate, sodium pentaborate pentahydrate, sodium metaborate tetrahydrate, sodium metaborate dihydrate, disodium octaborate tetrahydrate, and mixtures thereof.

Claim 19

A detergent composition consisting essentially of the following by weight: (a) from 5% to 50% of an available halogen bleach composition comprising an available halogen bleach composition suitable for use in laundries to minimize localized attached on fabrics and dyes comprising particles of a halogen bleaching agent having at least one N-halo atom capable of releasing a hypohalite ion to an aqueous solution, said particles coated with sufficient soluble, hydrated, silicate-bound inorganic salt selected from the group consisting of sodium carbonate, trisodium phosphate, disodium phosphate, sodium sulfate, and condensed phosphates, in admixture with a soluble alkali metal salt of boric acid, whereby ratio of the N-halo atoms to the boron atoms in the composition is between 0.5:1 and 10:1, (b) from about 5% to 50% of a detergent agent, and (c) from 17% to 60% of a detergency builder.

Claim 20

A detergent composition consisting essentially of the following by weight: (a) from 5% to 50% of an available halogen bleach composition comprising an available halogen bleach composition suitable for use in laundries to minimize localized attached on fabrics and dyes comprising particles of a halogen bleaching agent having at least one N-halo atom capable of releasing a hypohalite ion to an aqueous solution, said particles coated with sufficient soluble, hydrated, silicate-bound inorganic salt selected from the group consisting of sodium carbonate, trisodium phosphate, disodium phosphate, sodium sulfate, and condensed phosphates, in admixture with a soluble alkali metal salt of boric acid, whereby ratio of the N-halo atoms to the boron atoms in the composition is between 0.5:1 and 10:1, (b) from about 5% to 50% of a detergent agent, and (c) from 17% to 60% of a detergency builder.

Claim 21

The detergent composition of claim 17 wherein the available halogen compound is a chlorinated cyanurate salt or hydrate.

Claim 22

The detergent composition of claim 17 wherein the alkali metal salt is selected from the group consisting of disodium tetraborate pentahydrate, disodium tetraborate tetrahydrate, sodium pentaborate pentahydrate, sodium metaborate tetrahydrate, sodium metaborate dihydrate, disodium octaborate tetrahydrate, and mixtures thereof.

Claim 23

The detergent composition of claim 18 wherein the alkali metal salt is selected from the group consisting of disodium tetraborate pentahydrate, disodium tetraborate tetrahydrate, sodium pentaborate pentahydrate, sodium metaborate tetrahydrate, sodium metaborate dihydrate, disodium octaborate tetrahydrate, and mixtures thereof.