Aqueous zeolite-containing liquid detergent stabilized with an e

Details Aqueous zeolite-containing liquid detergent stabilized with an e Aqueous zeolite-containing liquid detergent stabilized with an e

1992-03-06

1993-10-12

Albrecht, Dennis

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

252118, 252121, 252122, 252123, 252131, 252132, 252140, 252173, 25217414, 25217419, 25217421, 25217425, 252540, 252559, 252DIG14, C11D 304, C11D 310, C11D 312, C11D 1708

Patent

active

052522440

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a phosphate-free, water-based liquid detergent containing zeolite as builder and to a process for its production.


DISCUSSION OF THE RELATED ART

Liquid detergents containing builders are known in large numbers. In these water-based concentrates, even basically water-soluble builders, such as sodium tripolyphosphate for example, are partly undissolved and are present in the form of fine particles. In the interests of safety in use, liquid detergents of the type in question have to be formulated as stabilized homogeneous suspensions. If the tripolyphosphate is replaced by zeolite NaA, the problem of suspension stabilization also has to be solved for this insoluble and fine-particle component. To this end, it is proposed in German patent application 36 05 978 to suspend the zeolite particles in a non-aqueous liquid (liquid nonionic surfactant) and to increase the stability of the suspension by addition of the aluminium salt of a higher aliphatic carboxylic acid (aluminium tristearate). German patent application 36 25 189 describes non-aqueous, liquid universal detergents containing 25 to 45% by weight of one or more liquid nonionic surfactants, 10 to 20% by weight salts of nitrilotriacetic acid, 10 to 25% by weight zeolite and an anti-gelling agent, for example a nonionic surfactant reacted with succinic anhydride or an alkylene glycol monoalkyl ether, and aluminium tristearate as stabilizer.
U.S. Pat. No. 4,018,720 describes water-based liquid detergents containing 7 to 25% by weight of a mixture of alkyl sulfates or alkyl ether sulfates and alkyl benzenesulfonates, 6 to 25% by weight of a phosphate builder, 3 to 20% by weight of an alkali metal sulfate as stabilizer and, optionally, 1 to 10% by weight of an aluminosilicate as cobuilder. The sole use of alkyl zinc sulfonate as anionic surfactant leads to physically unstable compositions in the same way as the addition of solvents, such as alcohols or glycols.
Canadian patent application 1,202,857 describes stable, water-based liquid detergents containing 13 to 38% by weight zeolite, 5 to 40% by weight unsaturated C.sub.16-22 fatty acid soap, 7 to 20% by weight surfactants, such as alkoxylated nonionic surfactants and amine oxides, 5 to 15% by weight water-soluble builders, such as polycarboxylates and pyrophosphate, and 30 to 70% by weight water. The detergents in question may also contain amphoteric and other anionic surfactants, including saturated soaps.
European patent application 75 976 describes alkaline water-based liquid detergents which contain 7 to 30% by weight zeolite, 5 to 40% by weight of an unsaturated C.sub.16-22 fatty acid soap, 1 to 30% by weight of a nonionic surfactant, 5 to 15% by weight of a water-soluble polycarboxylate and 20 to 82% by weight water, but which are free from synthetic anionic surfactants because they would destabilize the perfume esters present in this stable liquid mixture.
European patent application 86 614 describes water-based liquid detergents containing anionic and/or nonionic, cationic and amphoteric surfactants, water-insoluble, suspended and optionally water-soluble builders and other electrolytes; sodium sulfate must not be present in quantities above 3% by weight. In the interests of stability, tripolyphosphate or mixtures of tripolyphosphate and other builder substances is/are preferably used as builder. Whereas phosphate-containing suspensions showed no signs of sedimentation, in some cases even after storage for 12 months at room temperature, phosphate-free detergents containing 13.4% by weight zeolite and 8.9% by weight silicate or 13.6% by weight zeolite and 9.0% by weight silicate as builders were stable in storage for only month at room temperature.
European patent application 142 185 describes stable water-based liquid detergents containing condensed phosphates and/or nitrilotriacetate together with zeolite NaY. The suspensions have a pH value of 7 to 9. The detergents contain 1 to 60% by weight surfactants, 0.5 to 30% by weight phosphate and/or nitrilotriacetate and 1 to 4

REFERENCES:
patent: 4083793 (1978-04-01), Jakobi
patent: 4153569 (1979-05-01), Brom
patent: 4265777 (1981-05-01), Boyer
patent: 4280920 (1981-07-01), Garvey
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patent: 4530780 (1985-07-01), Pas
patent: 4871467 (1989-10-01), Akred
patent: 4929380 (1990-05-01), Schulz
patent: 4965014 (1990-10-01), Jeschke

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