Compositions – Fluent dielectric – N-containing
Patent
1991-05-24
1993-08-10
Langel, Wayne
Compositions
Fluent dielectric
N-containing
C11D 3065
Patent
active
052346285
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a paste-form, non-phosphate detergent which is particularly suitable for the washing of working apparel that has been heavily soiled, for example with mineral oil, and which does not generate troublesome quantities of foam when used in automatic washing machines. The detergent according to the invention is intended to foam only slightly both in the main wash cycle and in the rinse cycle, even under particularly critical conditions, i.e. even where softened water is used, as is normally the case in institutional laundries, so that no malfunctions occur in the automatic machines used in such laundries.
Paste-form detergents, particularly those having a high content of strongly alkaline constituents, such as sodium metasilicate or soda, have the advantage over powder-form detergents that they can be handled and dispensed with no dust emission. They are particularly suitable for automatic dispensing systems. Their problem is that they have to be sufficiently flowable in a relatively wide temperature range, which seriously restricts freedom of formulation, particularly where it is intended to incorporate large amounts of solid active substances in the paste. Another requirement which paste-form detergents have to satisfy is that they should not separate in storage. A further requirement is that no solvents or suspension stabilizers should be used because they do not contribute to the performance of the detergent.
The present invention, by which this problem is solved, relates to a paste-form, non-phosphate detergent which is characterized in that it contains the following constituents: C.sub.9-13 alkyl chains, C.sub.12-15 alcohol containing 2 to 4 ethylene glycol ether groups, C.sub.12-15 alcohol containing 6 to 8 ethylene glycol ether groups, SiO.sub.2 =1:0.8 to 1:1.5, agent from the group consisting of nitrilotriacetic acid and polyphosphonic acids, redeposition-inhibiting effect, constituents,
The detergent preferably has the following composition:
Constituent (A) consists of an alkyl benzene sulfonate which contains 10 to 13 C atoms in the linear alkyl chain and which is normally called dodecyl benzene sulfonate.
Constituent (B) contains 12 to 15 C atoms in the alcohol radical and may be derived from native or synthetic alcohols (oxoalcohols). Oxoalcohols typically consist of a mixture of linear and 2-methyl-branched alcohols, the linear component being intended to prediminate.
Constituent (C) is derived from the same alcohol or alcohol mixtures as constituent (B). In the interests of low foaming, the C.sub.12 alcohol component preferably makes up no more than 50% by weight of the alcohol radicals of components (B) and (C), the detergent containing in all no more than 2% by weight and, more especially, less than 1% by weight ethoxylated C.sub.16-18 alcohols.
Component (D) consists of sodium silicate in which the ratio of Na.sub.2 O to SiO.sub.2 is from 1:0.8 to 1:1.5 and preferably from 1:0.9 to 1:1.1. The sodium silicate is used in the form of the anhydrous salt.
Constituent (F) is a nonionic or anionic polymer having a redeposition-inhibiting effect. Particularly suitable polymers of this type are cellulose ethers, such as Na carboxymethyl cellulose and mixtures thereof with other cellulose ethers, such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, or mixed ethers, such as methyl hydroxyethyl cellulose, methyl carboxymethyl cellulose or ethyl hydroxyethyl cellulose. Other suitable polymers are polyacrylic acid, copolymers of acrylic acid and vinyl ethers, copolymers of acrylic acid and vinyl ethers, copolymers of acrylic acid and maleic acid (Sokalan.RTM.) in the form of the sodium salts and other known copolymers of acrylic acid with copolymerizable olefinic compounds. Cellulose ethers and synthetic polymers may also be used in combination. Mixtures of carboxymethyl cellulose with methyl cellulose or methyl hydroxyethyl cellulose have proved to be particularly useful.
Component (E) consists of at least one complexing agent from the group
REFERENCES:
patent: 4832863 (1989-05-01), Trabitzsch et al.
patent: 4929380 (1990-05-01), Schulz et al.
patent: 4965014 (1990-10-01), Jeschke et al.
Amberg Guenther
Trabitzsch Uwe
Grandmaison Real J.
Hendrickson Stuart L.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Langel Wayne
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