Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Patent
1997-10-31
2000-06-27
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
510126, 510128, 510341, 510356, 510413, 510421, 510480, 510501, C11D 188, C11D 1722
Patent
active
060807164
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an alkaline detergent concentrate with high contents of a nonionic surfactant and a complexing agent and in the form of a clear aqueous solution which, after diluting with water, is suitable for use as detergent for hard surfaces, dishwashing and textile washing. As solubiliser, the concentrate contains an amphoteric compound.
It is generally desirable that concentrates of alkaline detergent compositions can be produced in the form of clear solutions having high contents of surfactants and complexing agents and/or alkali. Thus, it is known from WO 93/23158 to solubilise alkaline detergent concentrates containing 5% by weight of a nonionic surfactant by using a mixture of a dimeric or oligomeric fatty acid and a C.sub.6 -C.sub.12 fatty acid as solubiliser. EP-A-105,063 discloses alkaline detergent compositions for hard surfaces, the compositions having high contents of surfactant and complexing agent. As solubiliser, use is made of water-soluble salts of low-molecular organic acids, such as sodium or potassium salts of toluene, benzene, cumene sulfonic acid and sodium and potassium salts of sulfonsuccinic acid. In addition to the solubiliser, use is also made of conventional organic solvents. U.S. Pat. No. 3,956,161 discloses the use of salts of a C.sub.21 dicarboxylic acid as solubiliser for an alkaline nonionic detergent concentrate. U.S. Pat. No. 5,051,212 discloses a detergent composition for hard surfaces, containing 6-10% of a surfactant and 16-24% of a binary mixture of solvent and complexing agent. The solvent usually is a C.sub.1 -C.sub.3 alcohol, a C.sub.6 -C.sub.9 alkylaromatic hydrocarbon or a diol having 6-16 carbon atoms. In all the examples, the greater part of the surfactant is an anionic surfactant. In no case does a nonionic surfactant constitute more than 2% of the concentrate. Other commonly used solubilisers in detergent compositions are alkyl phosphate compounds, amphoteric compounds or fatty alkyl aminoethoxylate having 8-14 carbon atoms in the alkyl group. The publication 3rd Cesio International Surfactants--a World Market; Proceedings Section D, Applications, pp 312-313, thus describes that amphoteric compounds have a solubilising effect on nonionic systems in concentrates with moderate contents of both nonionic surfactant and complexing agent.
The object of the present invention is to be able to formulate an alkaline detergent concentrate in the form of a clear solution in water. The concentrate should contain a very high content of nonionic surfactant and complexing agent and should, after diluting with water, be suitable for use as detergent for, among other things, hard surfaces, dishwashing and textile washing. A further object is that the concentrate has the form of a solution within a wide temperature range. Since concentrates having high contents of nonionic surfactant have inverted solubility, i.e. the solubility decreases as the temperature increases, the concentrates should have the form of a clear solution, at least up to 40.degree. C., preferably up to 50.degree. C., most advantageously up to 80.degree. C.
It has now surprisingly been found that the desiderata stated above can be achieved by using as solubiliser an amphoteric compound as solubility mediator. The alkaline concentrate according to the invention, which is in the form of a clear aqueous solution and which, after deluting with water, is suitable for use as detergent, contains at least 4% by weight of a nonionic alkoxylate surfactant containing 2-12, preferably 3-10 alkyleneoxy groups having 2-4 carbon atoms, at least 50% of the alkyleneoxy groups being ethyleneoxy groups, at least 13% by weight of a complexing agent, and 1-15% by weight of an amphoteric compound having the formula ##STR1## wherein R.sub.1 is a hydrocarbon group having 4-20 carbon atoms, Z is the group CO, a group (B).sub.n OCH.sub.2 CH(OH)CH.sub.2, wherein B is an oxyalkylene group having 2-4 carbon atoms and n is from 0 to 5, or the group CH(OH)CH.sub.2, z is 0 or 1, R.sub.2 is the group --C.sub.2 H.sub.4 --
REFERENCES:
patent: 3912662 (1975-10-01), Martinsson et al.
patent: 3956161 (1976-05-01), Woodward
patent: 4670179 (1987-06-01), Inamorato et al.
patent: 5051212 (1991-09-01), Culshaw et al.
patent: 5132053 (1992-07-01), Crossin
patent: 5331100 (1994-07-01), Smith et al.
GOSIP, Cesio International Surfacants Congress & Exhibition--A World Market, Jun. 1-5, 1992.
Hammarstrand Karin
Karlsson Gunvor
Skold Rolf
Akzo Nobel N.V.
Boyer Charles
Gupta Yogendra
Mancini Ralph J.
Parker Lainie E.
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