Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Patent
1998-07-31
1999-10-05
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
510444, 510446, 510452, 510477, 510504, 510507, 510509, 510511, C11D 1100, C11D 162
Patent
active
059623977
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a process for the preparation of a granular detergent component and also concerns granular detergent components comprising cationic surfactant, in particular hydrolysable cationic surfactants such as choline ester.
It is known to prepare detergent powders by spray-drying cationic surfactants optionally together with other surfactants and builders.
U.S. Pat. No. 4,347,168, issued on Aug. 31st, 1982 discloses spray-drying of alkaline crutcher mixes comprising cationic surfactants. It is stated that suitable cationic surfactants include various choline ester quaternary ammonium halides.
However, choline esters are readily hydrolised, especially in alkaline conditions. Consequently such powders are unsuitable for use by dry mixing directly into commercial granular detergent compositions which are usually alkaline.
The object of the invention is to provide a granular detergent components which comprise hydrolysable cationic surfactant and which are stable in commercial detergent compositions.
SUMMARY OF THE INVENTION
According to the invention this object is achieved by a process for the preparation of a granular detergent component comprising the steps of: component further comprises an acid, the granular detergent component having a reserve acidity of at least 1.0 g HCl/100 g, preferably at least 3.0 g HCl/100 g, and more preferably at least 8.0 g HCl/100 g.
Preferably the powder of step (i) is formed by spray drying and comprises at least 20%, preferably at least 50% by weight of choline ester.
In a first embodiment of the invention the powder is densified by compaction in the presence of other detergent powders. In a second embodiment of the invention the powder is densified by agglomeration in the presence of other detergent powders. Preferred detergent powders are aluminosilicate, carbonate, bicarbonate, silicate, sulphate, citrate, clay or mixtures thereof. Preferred acids are citric, sulphuric, hydrochloric, polycarboxylic acid, or mixtures thereof.
The invention also relates to granular detergent components having a bulk density of at least 500 g/l comprising: and of an acid selected from the group consisting of citric, sulphuric, hydrochloric, polycarboxylic acid, or mixtures thereof), 5% to 70% by weight of detergent powders selected from the group consisting of aluminosilicate, carbonate, bicarbonate, silicate, sulphate, citrate, clay or mixtures thereof), 1.0 g HCl/100 g.
DETAILED DESCRIPTION OF THE INVENTION
Preferred cationic surfactant are choline ester derivatives such as those having the following formula: ##STR1## wherein R is a C.sub.5 to C.sub.30 straight chain or branched chain alkyl or alkenyl, group and X is an anion, which makes the compound at least water-dispersible, preferably selected from the group consisting of halide, methyl sulfate, sulfate, and nitrate, preferably methyl sulfate, chloride, bromide or iodide, as well as those wherein the ester linkage in the above formula is replaced with a reverse ester, amide or reverse amide linkage.
Particularly preferred examples of this type of cationic surfactant include stearoyl choline ester quaternary ammonium halides (R.sup.1 =C.sub.17 alkyl), palmitoyl choline ester quatemary ammonium halides (R.sup.1 =C.sub.15 alkyl), mystiroyl choline ester quatemary ammonium halides (R.sup.1 =C.sub.13 alkyl), lauroyl choline ester ammonium halides (R.sup.1 =C.sub.11 alkyl), as well as coconut and tallow choline ester quatemary ammonium halides (R.sup.1 =C.sub.15 -C.sub.17 alkyl and C.sub.19 -C.sub.13 alkyl, respectively).
Additional preferred cationic components of the choline ester variety are given by the structural formulas below, wherein p may be from 0 to 20. ##STR2##
The preferred choline-derivative cationic substances, discussed above, may be prepared by the direct esterification of a fatty acid of the desired chain length with dimethylaminoethanol, in the presence of an acid catalyst. The reaction product is then quatemized with a methyl halide, forming the desired cationic material.
The choline-derived
REFERENCES:
patent: 4203851 (1980-05-01), Ramachandran
patent: 4228044 (1980-10-01), Cambre
patent: 4321157 (1982-03-01), Harris et al.
patent: 4715979 (1987-12-01), Moore et al.
patent: 5259964 (1993-11-01), Chavez et al.
patent: 5338476 (1994-08-01), Pancheri et al.
Ridyard Mark William
York David William
Bolam Brian M.
Douyon Lorna M.
Goodrich D. Mitchell
Gupta Yogendra
Rasser Jacobus C.
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