Composition and method for road-film removal
View Patent ↗A concentrate and a ready-to-use or diluted formulation for an aqueous vehicle cleaner can remove a wide range of different types of traffic film using either low pressure application, hand pressure application, water jet spray apparatus, clean-in-place systems or other manual or mechanical washing systems. The compositions may comprise, for example, one or more solutions that each or collectively contain or comprises: a) at least one anionic surfactant; b) at least one poly[oxyalkylene] ammonium cationic surfactant; and c) an alkaline agent. Optional additional ingredients may comprise at least one polycarboxylic acid chelating agent (preferably an aminocarboxylic acid chelating agent), at least one non-ionic or amphoteric surfactant, at least one hydrotrope, inorganic and/or organic acids and at least one silicate. The alkaline agent may provide a pH (when the finished product is diluted to 0.5 to 5% by weight in water) will be between about 9 to 13. The concentrate may be provided as a one-part or two part solution. Certain formulations have been found to be shelf stable as one-part concentrate or ready-to-use solutions, even with significantly different properties amongst the components. The compositions of the invention are also used in cleaning processes for surfaces, especially vehicle surfaces in car wash systems. The compositions are used in such processes where there are single or multiple liquid application steps.
1. A process for cleaning a surface comprising applying at least two separate applications of aqueous liquids to a surface to be cleaned, at least one of the aqueous liquids applied to said surface comprising an aqueous solution having a pH of between 2.0 and 13 and comprising:
(a) anionic surfactant comprising at least one of linear alkyl benzyl sulfonates, alpha olefin sulfonates, alkyl sulfates or secondary alkane sulfonates,
(b) propoxylated ammonium cationic surfactant comprising a surfactant having the formula:
wherein R, R 1 , and R 2 are independently selected from lower alkyl groups, R 3 comprises a polyoxyropylene chain, and X comprises an anion, and
(c) an alkaline agent or an acidulating agent.
2. A process according to claim 1 , wherein the aqueous solution has a pH of between 8.5 and 11.5 and additionally comprises at least one polycarboxylic acid chelating agent.
3. A process according to claim 1 , wherein the polyoxypropylene chain comprises at least one of:
wherein n is 1 to 60, and m is 0 to 30.
4. A process according to claim 1 , wherein the polyoxypropylene chain comprises a least one of:
and the ratio n/m is greater than 4 and m+n is between 3 and 60.
5. A process according to claim 1 , wherein the aqueous solution contains at least one additional additive comprising aminocarboxylic acid chelating agent, nonionic surfactant, amphoteric surfactant, or silicate.
6. A process according to claim 1 , therein the aqueous solution comprises:
(a) about 2×10 −3 to 50% by weight of a chelating agent for multivalent metal cations,
(b) about 1×10 −2 to 25% by weight of said anionic surfactant,
(c) about 1×10 −2 to 8% by weight of said propoxylated ammonium cationic surfactant, and
(d) about 0.25% to 12% by weight of said alkaline agent.
7. A process according to claim 6 , wherein said chelating agent comprises a polycarboxylic acid chelating agent.
8. A process according to claim 7 , wherein said polycarboxylic acid chelating agent comprises an amine polycarboxylic acid.
9. A process according to claim 7 , wherein said polycarboxylic acid chelating agent comprises a polycarboxylic acid comprising DTPA, EDTA or HEDTA.