Fraikin, Marie-Helene; Dillarstone, Alan;

Concentrated fabric softening compositions

Stable concentrated fabric softener compositions comprising a mixture of an imidazolinium quaternary ammonium compound with a dicationic quaternary ammonium compound. Such compositions exhibit stable viscosity characteristics at both low and high ambient temperatures.

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We claim:

1. A stable, aqueous, concentrated fabric softening composition consisting essentially of water and about

(a) 8 to 20% by weight of an imidazolinium softener compound of the formula: ##STR5## wherein R.sub.1 is C.sub.8 to C.sub.30 aliphatic radical;

R.sub.2 and R.sub.3 are independently selected from R.sub.1 radicals, or C.sub.1 to C.sub.4 alkyl or substituted C.sub.1 to C.sub.4 alkyl and

X is a water-solubilizing anion, and

(b) from about 0.5 to about 5% by weight of a polyquaternary compound of the formula: ##STR6## wherein R is C.sub.10 to C.sub.30 aliphatic radical;

R.sub.1 's are independently hydrogen, C.sub.1 to C.sub.4 alkyl or hydroxyalkyl;

n is an integer from 2 to 6;

m is an integer from 1 to 5; and

X is a water-solubilizing anion, the weight ratio of (A) to (B) ranging from 40:1 to 5:1.

2. A composition as defined in claim 1 including up to about 5% by weight of electrolyte.

3. A composition as defined in claim 1 wherein the imidazolinium softener is a 2-heptadecyl-1-methyl-(2-stearoylamidoethyl) imidazolinium salt.

4. A composition as defined in claim 3 where the polyquaternary compound is N-tallowyl-,N,N,N.sup.1,N.sup.1,N.sup.1 -pentamethyl-1,3-propanediammonium dimethosulfate.

5. A composition as defined in claim 4 wherein the amount by weight of compound A is about 15% and that of B is about 2%.

6. A method for preparing a composition as defined in claim 2 which comprises first preparing an aqueous solution of at least part of the electrolyte and thereafter adding the compounds (A) and (B) followed by the balance of any electrolyte.