Fabric softener active composition
View Patent ↗The present invention is directed to compositions that are characterized by the presence of ester quats with specific characteristics that promote dispersibility at low temperature. Among the important characteristics of the ester quats are an iodine value of 65-85 and distribution of: 33-38% monoesters, 50-55% diesters and 7-12% triesters.
1. A fabric softening active composition, comprising:
a) ester quats of formula (I):
wherein R 1 , R 2 and R 3 are hydrogen or a group C(O)R 5 ;
R 5 is an alkyl or alkenyl group comprising 11 to 21 carbon atoms;
A − is a fabric softener compatible anion;
R 4 is methyl or ethyl;
and wherein:
i) on a normalized wt % basis: 33-38% of said ester quats are monoesters; 50-55% of said ester quats are diesters; and 7-12% of said ester quats are triesters; and
ii) said R 5 groups have an iodine value, calculated for the free fatty acid R 5 COOH, of from 65 to 85 and the cis to trans ratio of unsaturated bonds of said R 5 groups is less than 12:1; and
b) 10-25% by weight of an alcoholic solvent.
2. The fabric softening active composition of claim 1 , wherein 52-55% of said ester quats are diesters.
3. The fabric softening active composition of claim 1 , wherein the iodine value is from 65 to 75.
4. The fabric softening active composition of claim 1 , wherein the cis to trans ratio of unsaturated bonds is between 5:1 and 9:1.
5. The fabric softening active composition of claim 1 , wherein said R 5 groups have a polyunsaturation level of less than 10%.
6. The fabric softening active composition of claim 5 wherein the cis to trans ratio of unsaturated bonds is between 5:1 and 9:1.
7. The fabric softening active composition of claim 1 , wherein the average chain length of R 5 groups in said ester quats is from 15 to 17 carbon atoms.
8. The fabric softening active composition of claim 1 , wherein said alcoholic solvent is ethanol or 2-propanol.
9. The fabric softening active composition of claim 1 , wherein said alcoholic solvent is ethylene glycol, propylene glycol, dipropylene glycol or a C 1 -C 4 alkyl monoether of ethylene glycol.
10. The fabric softening active composition of claim 1 , wherein ester quats according to formula (I) are present at a level of at least 50% by weight.
11. An aqueous fabric softener composition comprising the fabric softener active composition of claim 1 and sufficient water so that the ester quats of formula (I) are present at 2-30% by weight.
12. The aqueous fabric softener composition of claim 11 , further comprising a viscosity aid, preservative, thickener or perfume.
13. A method of making the aqueous fabric softener of claim 11 , comprising mixing the fabric softening active composition of claim 1 with water or an aqueous solution at a temperature of 5-30° C.
14. The method of claim 13 , wherein said fabric softening active composition and said water or aqueous solution are mixed at a temperature of 5-25° C.
15. The method of claim 13 , wherein said fabric softening active composition and said water or aqueous solution are mixed at a temperature of 15-25° C.
16. The method of claim 13 , wherein said aqueous fabric softener further comprises a perfume and is made by mixing the fabric softening active composition of claim 1 with a perfume and water, or an aqueous solution, said mixing being carried out at a temperature of 5-30° C.
17. The method of claim 16 , wherein said fabric softening active composition and said perfume are concurrently mixed with water or an aqueous solution.
18. The method of claim 16 , wherein said fabric softening active composition and said perfume are first mixed at a temperature of 5-30° C. and then mixed with water or an aqueous solution.
19. A dryer activated sheet for use in dryers, comprising a substrate sheet of non-woven material impregnated with an aqueous dispersion of the fabric softening active composition of claim 1 .
20. The dryer activated fabric softener sheet of claim 19 , wherein said substrate sheet is made from a material selected from the group consisting of: cellulose fibers; synthetic fibers; polyester, nylon, and polypropylene fibers.