Fabric conditioning compositions
View Patent ↗In a concentrated fabric softening composition comprising an aqueous dispersion of less than 30% by weight of quaternary ammonium fabric softening material which comprises two C 12 -C 22 alkyl or alkenyl groups connected to the molecule via at least one ester link, such as ester quat, improved stability of the viscosity on storage is obtained by including an unsaturated C 8 -C 24 fatty acid, wherein the weight ratio of quaternary ammonium material to unsaturated material is greater than 10:1.
1. A fabric softening composition comprising an aqueous dispersion of:
(a) from 4 to 25% by weight of a quaternary ammonium fabric softening material represented by the formula:
wherein each R 1 group is independently selected from C 1-4 alkyl, hydroxy alkyl or C 2-4 alkenyl groups; and wherein each R 2 group is independently selected from C 8-28 saturated alkyl groups;
T is
X − is any suitable anion including halide, acetate and lower alkosulphate ions and n is 0 or an integer from 1-5; and
(b) an unsaturated C 8 -C 24 fatty acid as a viscosity stabiliser, wherein the cis:trans isomer weight ratio in the unsaturated fatty acid is from 20:80 to 150:1, and
wherein the weight ratio of said quaternary ammonium material to said unsaturated fatty acid is greater than 12:1.
2. A fabric softening composition according to claim 1 , further comprising at least one salt of a multivalent inorganic anion or non-sequestering multivalent organic anion.
3. A fabric softening composition as claimed in claim 1 wherein the fatty acid material is an unsaturated C 18 -C 22 fatty acid.
4. A fabric softening composition as claimed in claim 1 wherein the iodine value of the fatty acid is from 10 to 140.
5. A fabric softening composition as claimed in claim 1 wherein the cis:trans isomer weight ratio in the unsaturated fatty acid is from 40:60 to 99:1.