Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Solid – shaped macroscopic article or structure
Patent
1996-10-18
1998-07-14
Hertzog, Ardith
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Solid, shaped macroscopic article or structure
510348, 510361, 510443, 510476, 510469, 510477, 510480, 510504, C11D 1706, C11D 337, C11D 360, C11D 1002
Patent
active
057804192
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to detergent powders which essentially comprise a complexed chelating agent and an anionic polymer. The powders may be readily prepared by spray drying.
Detergent components and compositions have been made using various spray drying techniques for many years. Typically various detergent active materials are dissolved or dispersed in an aqueous solution which is then pumped under high pressure to an atomiser, such as a nozzle or a spinning disc.
Excess water is then removed from the atomised droplets by a drying gas, usually hot air. The dried droplets then form a free-flowing granular product. Most granular products prepared in this way comprise both organic and inorganic materials. One prior art disclosure of a detergent component in which the principle detergent active material is a complexed chelating agent is:
U.S. Pat. No. 4,259,200, issued on Mar. 31st, 1981 discloses complexes of chelating agent with metal ions. The complexes are said to have improved chemical stability in bleaching compositions. Various methods of obtaining a particulate product which comprises the metal/chelating agent complexes are also disclosed, including spray-drying, by including inorganic salts such as tetraborate, triphosphate, sulphate.
In fact, chelating agents are frequently precomplexed with magnesium in order to protect them from degradation in the presence of bleach. However molar ratios of magnesium: chelating agent of greater than 3:1 are difficult to prepare due to precipitation from aqueous solution. Precipitation in a spray drying process rapidly leads to blockage of the nozzle. Furthermore, powders which essentially consist of chelating agent/magnesium complex have a very low rate of solubility.
It has now been found that the addition of various polymers which comprise anionic functional groups avoids the precipitation problem, allows higher molar ratios of chelating agent to magnesium to be prepared by spray drying, and greatly increases the rate of solubility of the resulting powder.
The addition of anionic polymer also enables powders to be prepared which have a very high organic content, preferably greater than 80%. Such powders which are difficult to prepare by other means, provide a convenient method for handling and processing organic polymers.
SUMMARY OF THE INVENTION
The present invention relates to free-flowing detergent powder which is prepared by spray drying, the powder comprising: calcium, strontium, zinc and aluminium, and mixtures thereof, functional groups which are anionic.
Preferably the powder comprises less than 20%, more preferably less than 10% by weight (on anhydrous basis), of inorganic components other than the metal ion (a)(ii). Most preferably the total level of aluminosilicate and carbonate (on anhydrous basis) is less than 10% by weight.
The chelating agent is preferably selected from the group consisting of phosphonic acid, succinic acid, the salts of phosphonic or succinic acid, or mixtures thereof, even more preferred chelating agents are diethylene triamine penta (methylene phosphonic acid), or ethylenediamine-N-N'-disuccinic acid, or their salts, or mixtures thereof. The preferred metal ion is magnesium. The molar ratio of the metal ion to the chelating agent is preferably greater than 3:1.
The polymer may comprise carboxylate functional groups, especially the water-soluble salts of homo-and copolymers of aliphatic carboxylic acids such as acrylic acid, maleic acid, vinylic acid, itaconic acid, mesaconic acid, fumaric acid, aconitic acid, citraconic acid, methylenemalonic acid and mixtures thereof.
A preferred polymer is a copolymer of maleic and acrylic acid having a molecular weight of from 2000 to 100 000.
Optionally the free-flowing detergent powder may also comprise a cationic surfactant. Where present the cationic surfactant may be present at from 1% to 80% by weight, from 2% to 20% by weight of dimethyl ethoxy ammonium chloride being preferred.
DETAILED DESCRIPTION OF THE INVENTION
The essential components of the present invention are
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Doumen Achille Jules Edmond
Goovaerts Luc
Vega Jose Luis
Hertzog Ardith
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim W.
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