Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Patent
1998-10-02
1999-12-21
Douyon, Lorna M.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
510347, 510400, 510466, 510469, 510507, 510513, C11D 1100
Patent
active
060049219
DESCRIPTION:
BRIEF SUMMARY
The invention relates to process for making a granular suds suppressing component, and to certain granular suds suppressing components.
Granular suds suppressing components are used in many applications, including in laundry detergents where it is often desirable to control or reduce the amount of suds generated in automatic washing machines. The formation of a large volume of suds in automatic washing machines is generally to be avoided because it reduces the efficiency of the washing process, and, in extreme cases can result in liquid overflowing the machine.
Many granular suds suppressing components have been proposed in the prior art to control suds.
GB2009223, published on Jun. 13, 1979, discloses granulated silicone/SiO2 suds suppressor wherein the silicone is premixed with nonionic surfactant (TAE25 in Examples 1-3, 5; and TAE14 in Example 4) and granulated on a carrier material such as phosphate, polyphosphate, silicate, aluminosilicate, carbonate sulphate, polycarboxylate or phosphonate.
EP636684, published on Feb. 1, 1995, discloses a foam control agent comprising 1-30% silicone antifoam; 70-99% zeolite; polysiloxane copolymer and 1-40% polycarboxylate binder.
In present day laundry detergents, especially when high levels of sudsing surfactants are being used to give good performance and cleaning efficiency, it is increasingly important to provide more effective suds suppressing components.
It is the object of the present invention to provide a process for making a highly effective granular suds suppressing component comprising the steps of:
(a) intimately mixing a liquid or molten suds suppressing component with an emulsifier to form a premix, and
(b) granulating the premix with a powder.
SUMMARY OF THE INVENTION
The object of the invention is achieved by using an anionic surfactant as the emulsifier. Furthermore, it is preferred that the granulating powder comprises aluminosilicate.
In a preferred embodiment of the invention the process further comprises the addition of a structuring agent selected from the group consisting of phosphonic and diphosphonic acid, carboxylic and polycarboxylic acid, succinic and disuccinic acid, and salts, and mixtures thereof. Hydroxyethyldiene diphosphonic acid, and polycarboxylic acid, or salts thereof are the most preferred structuring agents.
In a further aspect of the invention a granular suds suppressor is provided which comprises a silicone oil suds suppressing component and an anionic surfactant. Preferably the granular suds suppressor comprises: consisting of phosphonic and diphosphonic acid, carboxylic and polycarboxylic acid, succinic and disuccinic acid, and salts, and mixtures thereof; and to 2:1. The mean particle size of the granular suds suppressing component is at least 450 micrometers.
DETAILED DESCRIPTION OF THE INVENTION
A wide variety of materials may be used as suds suppressing agents such as monocarboxylic fatty acids and their soluble salts, high molecular weight hydrocarbons such as paraffin, fatty acid esters, fatty acid esters of monovalent alcohols, aliphatic C1-C40 ketones, N-alkoxylated amino triazines, propylene oxide, and monstearyl phosphates and phosphate esters. Another preferred category of suds suppressing agents comprises silicone suds suppressors. This category includes the use of polyorganosiloxane oils, such as polydimethyl siloxane, dispersions or emulsions of polyorganosiloxane oils or resins, and combinations of polyorganosiloxane with silica particles wherein the polyorganosiloxane is chemisorbed or fused onto the silica. Preferred polydimethylsiloxanes have trimethylsilyl endblocking units and have a viscosity at 25.degree. C. of from 5.times.10.sup.-5 m.sup.2 /s to 0.1 m.sup.2 /s, corresponding approximately to a degree of polymerisation of from 40 to 1500. Solid silica can be fumed silica, precipitated silica or silica made by gel-formation technique. The silica particles have an average particle size of from 0.1 to 50 micrometers, preferably from 1 to 20 micrometers and a surface area of at least 50 m.sup.2 /g
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Donoghue Scott John
Wilkinson Carole Patricia Denise
Douyon Lorna M.
Khosla Pankaj M.
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim W.
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