Rinse aid compositions with improved characteristics
View Patent ↗The present invention is directed to rinse aid compositions with improved biodegradability that may be used in automated carwash operations to promote drying and improve the appearance of vehicles.
1. A hard surface rinse aid composition for an automobile comprising:
a) an emulsifier comprising:
i) at least one compound of formula A:
and
ii) at least one compound of formula B:
wherein for both compounds of formula A and B:
R 1 and R 4 are each independently a C 7 -C 21 alkyl or alkenyl;
R 2 and R 3 are each independently a C1-C6 alkyl;
X is an organic or inorganic anion,
and wherein the compounds of formula A constitute more than 70 wt % of the total amount of compounds of formulae A and B; and
b) a hydrophobe, which is an ester of a monocarboxylic acid with a monohydric aliphatic alcohol, said ester having a total carbon number of from 9 to 60 carbon atoms, or a mineral oil;
wherein said composition further comprises water in the form of an emulsion; and wherein said composition, after dilution with water and upon contact with said surface uniformly plates out said hydrophobe on said surface.
2. The composition of claim 1 , wherein R 1 and R 4 are each independently a linear C 11 -C 17 alkyl or alkenyl group.
3. The composition of claim 1 , wherein R 1 and R 4 are alkyl and alkenyl groups of fatty acids selected from the group of coco fatty acids and canola fatty acids.
4. The composition of claim 1 , wherein R 2 and R 3 are CH 3 .
5. The composition of claim 1 , wherein the monocarboxylic acid is a fatty acid or fatty acid mixture and the alcohol is a branched chain aliphatic alcohol with from 6 to 12 carbon atoms.
6. The composition of claim 1 , wherein the hydrophobe is a biodegradable ester.
7. The composition of claim 1 , wherein the weight ratio of hydrophobe to emulsifier is 0.01-100.
8. The composition of claim 7 , wherein the weight ratio of hydrophobe to emulsifier is 0.5-2.0.
9. The composition of claim 1 , wherein said emulsion is an oil in water microemulsion.
10. The composition of claim 1 , wherein said composition comprises 1-40 wt % emulsifier; 1-40 wt % hydrophobe; and 20-98 wt % water.
11. The composition of claim 1 , wherein said composition further comprises 1-10 wt % of an organic solvent.
12. The composition of claim 11 , wherein said solvent is selected from the group of glycols, glycol ethers, and alcohols.
13. The composition of claim 1 , wherein said composition further comprises 1-10 wt % of a coemulsifier.
14. The composition of claim 13 , wherein said coemulsifier is a nonionic or amphoteric surfactant.