Fabric softening compositions
View Patent ↗Fabric softening products, such as a rinse conditioner or a tumble dryer sheet, comprise (a) an organic softening compound free of quaternary nitrogen groups and having the general formula (1) wherein R 1 and R 2 are both hydrophobic alkyl or alkenyl groups independently comprisng 5 to 40 carbon atoms and together comprising at least 26 carbon atoms, L is a linking group having at least 1 single bond providing freedom of rotation and providing a chain length of from 4 to 10 atoms between Q and R 1 /R 2 and Q is a hydrophilic head group; and (b) a carrier for the softening compound.
1. A fabric softening product comprising:
a) as a softening agent, at least one organic compound of the general formula:
which does not contain any cationic quaternary nitrogen group and in which formula:
Q denotes a hydrophilic aliphatic head group (i) containing at least six free hydroxyl groups, and
wherein there are no more than two carbon atoms for every hydroxyl group;
R 1 and R 2 each independently denote a hydrophobic aliphatic chain of 5 to 40 carbon atoms optionally interrupted by a heteroatom, provided that R 1 and R 2 together contain at least 26 carbon atoms, and
L denotes a linking group providing at least 1, preferably 2, single bonds capable of providing freedom of rotation and a chain of at least 4 atoms but not more than 10 atoms, between Q and R 1 and between Q and R 2 ;
wherein said linking group L is attached to a hydroxy-substituted carbon atom in the hydrophilic group Q; and
b) a carrier therefor.
2. A product according to claim 1 wherein the linking group, L, provides a chain length of from four to six atoms between R 1 and Q and between R 2 and Q.
3. A product according to claim 1 wherein the linking group L provides a chain length of one to three atoms between the groups R 1 and R 2 .
4. A product according to claim 1 in which either the linking group L or the hydrophilic head group Q includes a nitrogen atom capable of being protonated.
5. A product according to claim 3 in which the linking group L contains a nitrogen atom to which the hydrophilic head group Q is attached.
6. A product according to claim 1 wherein Q denotes an aliphatic group (i) which contains residues of more than one glycoside ring.
7. A product according to claim 6 wherein Q denotes an aliphatic group (i) which contains a carbon chain bearing at least two free hydroxyl groups and, joined thereto, at least one cyclic glycoside residue bearing free hydroxyl groups.
8. A product according to claim 1 wherein the hydrophobic aliphatic chains R 1 and R 2 each contain from 12 to 20 more preferably 16 to 18 carbon atoms.
9. A product according to claim 1 wherein the organic compound (a) is free of anionic groups.
10. A product according to claim 1 wherein the organic compound(s) (a) form an L β lamellar liquid crystal phase when dispersed at a concentration of 1% by weight in deionised water at 20° C. and adjusted to pH 7.
11. A product according to claim 1 which is an aqueous rinse conditioner composition wherein the carrier (b) comprises water and said fabric softening compound (a) is dispersed therein.
12. A product according to claim 1 which is in the form of a product for use in a tumble dryer wherein the said carrier (b) is a porous article and the said fabric softening organic compound (a) impregnates the said article.
13. A product according to claim 1 wherein Q denotes a di-saccharide group.
14. A product according to claim 1 wherein said product is a rinse conditioner or a tumble dryer sheet.
15. A product according to claim 1 wherein said hydrophilic head group Q is ethoxylated.