Process for making a particle

Patent metadata

Field	Value
Publication number	US-10377969-B2
Application number	US-201715643504-A
Country	US
Kind code	B2
Filing date	Jul 7, 2017
Priority date	Jul 8, 2016
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

A process for making a particle, the particle includes: a) a nitrogen-containing cleaning-active in the form of a salt wherein the salt has a pH in 1% weight aqueous solution measured at 25° C. greater than 9; and b) a malodor-reducing agent including an acid group wherein the process includes the step of adding the malodor-reducing agent to the nitrogen-containing cleaning-active wherein the malodor-reducing agent is added in the absence of water.

First claim

What is claimed is:

1. A process for making a particle, the particle comprising:
a) a nitrogen-containing cleaning-active in the form of a salt wherein the salt has a pH in 1% weight aqueous solution measured at 25° C. greater than 9; and
b) a malodour-reducing agent comprising an acid group
wherein the process comprises the step of adding the malodour-reducing agent to the nitrogen-containing cleaning-active and wherein the malodour-reducing agent is added in the absence of water, wherein the malodour-reducing agent is added as an anhydrous solution.

2. A process according to claim 1 comprising the step of forming a pre-particle containing the nitrogen-containing cleaning-active and admixing the pre-particle with the malodour-reducing agent wherein both the pre-particle and the malodour-reducing agent are in solid form.

3. A process according to claim 1 wherein the acid group is a carboxylic monomer and wherein the malodour-reducing agent is a carboxylic acid selected from the group consisting of citric acid, ascorbic acid, oxalic acid, adipic acid, succinic acid, glutaric acid, malic acid, tartaric acid, maleic acid, fumaric acid, sugar acids, fatty acids and mixtures thereof.

4. A process according to claim 1 wherein the malodour-reducing agent is a polymer comprising carboxylic and sulfonic groups.

5. A process according to claim 1 wherein the malodour-reducing agent has a Dv 50 of from about 10 to about 100 μm.

6. A process according to claim 1 wherein part of the nitrogen in the nitrogen-containing cleaning-active is in the form of an amine.

7. A process according to claim 1 wherein the nitrogen-containing cleaning-active is selected from the group consisting of salts of aminocarboxylic complexing agents, amine oxide surfactants, polymers comprising nitrogen and mixtures thereof.

8. A process according to claim 7 wherein the aminocarboxylic complexing agent is selected from the group consisting of salts of methyl glycine diacetic acid (MGDA), salts of glutamic-N,N-diacetic acid (GLDA) and mixtures thereof.

9. A process according to claim 1 wherein the malodour-reducing agent is selected from the group consisting of citric acid, ascorbic acid, oxalic acid, adipic acid, succinic acid, glutaric acid, malic acid, tartaric acid, maleic acid, fumaric acid, sugar acids, fatty acids and mixtures thereof.

10. A process according to claim 1 wherein the nitrogen-containing cleaning-active is a salt of MGDA and the malodour-reducing agent is citric acid.

Assignees

• Procter & Gamble

Inventors

• Letzelter Nathalie Sophie
• Ellis Julie

Classifications

• C11D17/0091

  Dishwashing tablets · CPC title

• C11D3/38609

  Protease or amylase in solid compositions only · CPC title

• C11D11/0088

  the liquefied ingredients being sprayed or adsorbed onto solid particles · CPC title

• C11D3/3769

  (Co)polymerised monomers containing nitrogen, e.g. carbonamides, nitriles or amines · CPC title

• C11D3/378

  (Co)polymerised monomers containing sulfur, e.g. sulfonate · CPC title