Low suds laundry detergents with enhanced whiteness retention
View Patent ↗A unique laundry detergent composition is described that comprises linear alkyl benzene sulfonate, alkyl ether sulfate, alcohol ethoxylate, fatty acid, an alkali metal silicate, polyacrylate, and optionally carbonate, that is low sudsing and that shows improved whiteness retention over other fatty acid soap containing detergents in the absence of silicates.
1. A liquid laundry detergent composition comprising:
a. from about 0.05% to about 2% by weight of said composition of a fatty acid soap;
b. from about 0.5% to about 4% by weight of linear alkyl benzene sulfonate surfactant;
c. from about 1% to about 10% by weight of an alkyl ether sulfate surfactant;
d. from about 0.5% to about 5% by weight of a linear alcohol ethoxylate nonionic surfactant;
e. from about 0.5% to about 5% of an alkali metal silicate;
f. from about 0.1% to about 1% of sodium polyacrylate homopolymer having molecular weight from about 2,000 to about 10,000; and
g. the balance water.
2. The composition of claim 1 wherein the said fatty acid soap is selected from the group consisting of sodium salts of saturated C 14 -C 18 carboxylic acids, sodium salts of unsaturated C 14 -C 18 carboxylic acids, potassium salts of saturated C 14 -C 18 carboxylic acids, potassium salts of unsaturated C 14 -C 18 carboxylic acids, and mixtures thereof.
3. The composition of claim 1 wherein the said linear alkyl benzene sulfonate surfactant is sodium dodecylbenzene sulfonate.
4. The composition of claim 1 wherein the said alkyl ether sulfate further comprises sodium alkyl ether sulfate with alkyl group carbon chain length of from about 12 to about 18 and a degree of ethoxylation of from about 1.5 to about 9 ethylene oxide moieties.
5. The composition of claim 1 wherein said silicate is sodium silicate having a SiO 2 /Na 2 O weight ratio of from about 1.6 to about 4.
6. The composition of claim 1 wherein said silicate is potassium silicate having a SiO 2 /K 2 O weight ratio of from about 1.6 to about 4.
7. The composition of claim 1 wherein said sodium polyacrylate homopolymer has an average molecular weight of from about 4,000 to about 5,000.
8. The composition of claim 1 wherein said linear alkyl ethoxylate nonionic surfactant has carbon chain length of from about 12 to about 18 and a degree of ethoxylation of from about 4 to about 9 ethylene oxide moieties.
9. The composition of claim 1 wherein said composition further comprises from about 0.1% to about 4% of an alkali metal carbonate selected from the group consisting of anhydrous potassium carbonate, hydrated potassium carbonate, anhydrous sodium carbonate, hydrated sodium carbonate and mixtures thereof.