Particulate laundry detergent composition containing zeolite
View Patent ↗A particulate zeolite-built laundry detergent composition having a bulk density of at least 550 g/l comprising at least two different granular components containing both surfactant and builder, preferably one prepared by non-tower granulation and another spray-dried, also contains from 1 to 10 wt % citric acid admixed as a separate particulate component. The admixed citric acid improves dispensing and dissolution properties, whether or not separately admixed sodium carbonate is present.
1. A particulate laundry detergent composition comprising organic surfactant and zeolite builder and having a bulk density of at least 550 g/l, which comprises:
(a) from 8 to 60 wt % of a first granular component, comprising zeolite and organic surfactant which is non-spray-dried and has a bulk density of from 600 to 1000 g/l, the first granular component comprising from 10 to 35 wt % of anionic sulphonate or sulphate surfactant,
from 5 to 20 wt % of ethoxylated nonionic surfactant,
from 30 to 45 wt % of zeolite MAP,
from 5 to 30 wt % (in total) of salt, the percentages being wt % based on the first granular component;
(b) from 5 to 70 wt % of there for second granular component comprising zeolite and organic surfactant which is spray-dried and has a bulk density not exceeding 550 g/l,
(c) from 1 to 10 wt % of citric acid as a separate particulate ingredient wherein the citric acid has a particle size d50 within the range of from 200 to 1000 micrometres, preferably from 250 to 600 micrometres, wherein the quantity d50 indicates that 50 wt % of the particles have a diameter smaller than that figure, and
(d) other detergent ingredients to 100 wt %.
2. A detergent composition as claimed in claim 1 , which comprises from 1.5 to 5 wt %, of citric acid.
3. A detergent composition as claimed in claim 1 , wherein the citric acid present as a separate particulate ingredient has a Rosin-Rammler average particle size within the range of from 200 to 1000 micrometres, preferably from 300 to 700 micrometres.
4. A detergent composition as claimed in claim 1 , wherein the citric acid present as a separate particulate ingredient is anhydrous.
5. A detergent composition as claimed in claim 1 , wherein the weight ratio of the first granular component to the citric acid present as a separate particulate ingredient is within the range of from 5:1 to 20:1, preferably from 5:1 to 15:1.
6. A detergent composition as claimed in claim 1 , wherein the first and second granular components are present in a weight ratio of from 0.1:1 to 2:1, preferably from 0.1:1 to 1:1.
7. A detergent composition as claimed in claim 1 , wherein the zeolite in the second granular component (b) comprises zeolite MAP or zeolite A.
8. A detergent composition as claimed in claim 1 , having a bulk density within the range of from 550 to 900 g/l, preferably from 600 to 800 g/l.
9. A detergent composition as claimed in claim 1 , comprising other admixed detergent ingredients selected from surfactant granules, bleach ingredients, antifoams, fluorescers, antiredeposition agents, soil release agents, dye transfer inhibiting agents, fabric conditioning agents, enzymes, perfumes, inorganic salts and combinations thereof.
10. A detergent composition as claimed in claim 1 , which contains sodium percarbonate.
11. A detergent composition as claimed in claim 1 , which does not contain postdosed sodium carbonate.