Process for making a free-flowing particulate dye transfer inhibiting detergent admix

• US 6,133,224 A
• Filed: 06/18/1999
• Issued: 10/17/2000
• Est. Priority Date: 12/20/1996
• Status: Expired due to Term

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Welch, Robert Gary, Cutter, Gary Ray, Angell, Adrian John Waynforth
• Primary Examiner(s): Douyon, Lorna M.
• Application Number:
  US09/331,303
• Time in Patent Office: 487 Days
• Field of Search: 510/444, 510/360, 510/475, 510/500, 510/503, 510/513, 510/531, 510/532
• US Class Current: 510/444
• CPC Class Codes: C11D 11/0082 one or more of the detergent ingredients being in a liquefied state, e.g. slurry, paste or melt, and the process resulting in solid detergent particles such as granules, powders or beads
• CPC Class Codes: C11D 17/06 Powder; Flakes; Free-flowing mixtures; Sheets
• CPC Class Codes: C11D 17/065 High-density particulate detergent compositions
• CPC Class Codes: C11D 3/0021 Dye-stain or dye-transfer inhibiting compositions
• CPC Class Codes: C11D 3/3723 Polyamines or polyalkyleneimines
• CPC Class Codes: C11D 3/3776 Heterocyclic compounds, e.g. lactam
• CPC Class Codes: C11D 3/3792 Amine oxide containing polymers

Abstract

Process for making a free-flowing, particulate dye transfer inhibiting detergent admix for inclusion in a granular laundry detergent composition consisting essentially of the steps of: charging from 50% to 95%, by weight of the dye transfer inhibiting detergent admix, of a detergent builder into a mixer/granulator; adding to the detergent builder from 5% to 50%, by weight of the dye transfer inhibiting detergent admix, of a dye transfer inhibitor solution to thereby form a mixture; and agglomerating the mixture of the dye transfer inhibitor solution and the detergent builder so as to form the dye transfer inhibiting detergent admix.

Claims

1. A process for making a free-flowing, particulate dye transfer inhibiting detergent admix for inclusion in a granular laundry detergent composition consisting essentially of the steps of:

a) charging from 50% to 95%, by weight of the dye transfer inhibiting detergent admix, of a detergent builder into a mixer/granulator;

b) adding to the detergent builder from 5% to 50%, by weight of the dye transfer inhibiting detergent admix, of a dye transfer inhibitor solution to thereby form a mixture wherein the dye transfer inhibitor solution contains a dye transfer inhibitor selected from the group consisting of polyamine N-oxide polymers, copolymers of N-vinylpyrrolidone and N-vinylimidazole, and mixtures thereof; and

c) agglomerating the mixture of the dye transfer inhibitor solution and the detergent builder so as to form the dye transfer inhibiting detergent admix.

2. A process according to claim 1 wherein the dye transfer inhibitor solution comprises from about 10% to about 100% by weight of a dye transfer inhibitor.

3. A process according to claim 1 wherein from about 10% to about 35% by weight of the dye transfer inhibitor solution is charged to the mixer/granulator.

4. A process according to claim 1 wherein the polyamine N-oxide polymer is poly(4-vinylpyridine-N-oxide) having a molecular weight of from about 500 to about 1,000,000 and an amine to amine N-oxide ratio of about 1:

4.

5. A process according to claim 1 wherein the density of the dye transfer inhibiting detergent admix is from about 400 g/l to about 1000 g/l.

6. A process according to claim 1 wherein the mean particle size of the dye transfer inhibiting detergent admix is from about 150 microns to about 1,200 microns.

7. A process for making a free-flowing, particulate dye transfer inhibiting detergent admix for inclusion in a granular laundry detergent composition consisting essentially of the steps of:

a) charging from about 65% to about 90% by weight of a zeolite detergent builder into a mixer/granulator;

b) adding to the zeolite detergent builder from about 10% to about 35% by weight of a dye transfer inhibitor solution at a temperature of from about 10°

C. to about 50°

C., wherein the dye transfer inhibitor solution comprises from about 20% to about 100%, by weight of the solution, of a dye transfer inhibitor selected from the group consisting of polyamine N-oxide polymers, copolymers of N-vinylpyrrolidone and N-vinylimidazole, and mixtures thereof;

c) agglomerating the dye transfer inhibitor solution and the zeolite detergent builder so as to form the dye transfer inhibiting detergent admix.

8. A process according to claim 7 wherein the polyamine N-oxide polymer is poly(4-vinylpyridine-N-oxide) having a molecular weight of from about 500 to about 1,000,000 and an amine to amine N-oxide ratio of about 1:

4.

9. A process according to claim 7 wherein the density of the dye transfer inhibiting detergent admix is from about 550 g/l to about 850 g/l.

10. A process according to claim 7 wherein the mean particle size of the dye transfer inhibiting detergent admix is from about 150 microns to about 1,200 microns.