Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Solid – shaped macroscopic article or structure
Patent
1997-09-23
1999-01-12
McGinty, Douglas J.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Solid, shaped macroscopic article or structure
510456, 510351, 510356, 510360, 510361, 510477, 510495, 510502, 264 8, 264140, C11D 1100, B29B 900
Patent
active
058589570
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for the manufacture of detergent compositions or components from a surfactant paste which is rich in nonionic surfactant.
Nonionic surfactants are important components of current laundry detergent compositions. Present trends demand particulate components or compositions which have a high level of nonionic surfactant.
WO9206160, published on 16th Apr. 1992, discloses high performing nonionic surfactant systems based on mixtures of glucose amides and ethoxylated nonionic surfactants. In one example (example 20) a component is described which comprises a nonionic surfactant system which is a mixture of ethoxylated nonionic and N-methyl glucose amide in aqueous solution. The surfactant system is granulated in a high shear mixer in the presence of anionic surfactants and detergent powders. The total nonionic surfactant concentration of the finished granular detergent component is 26% by weight, and the anionic surfactant concentration is 21% by weight.
EP-A-643 130, published on Mar. 15, 1995, describes a granular laundry detergent having good physical characteristics, which delivers nonionic surfactants which have been selected for high performance in to the wash. Surfactant pastes are described which have a defined viscosity profile which enables high shear mixing and granulation processes to be performed in order to make granular detergent components having nonionic surfactant activities in excess of 50% by weight (in Example 9).
The present invention aims to provide a new and versatile process for an even wider range of nonionic surfactant rich pastes. This is achieved by: the surfactant paste comprising at least 50% by weight of nonionic surfactants; surfactant paste;
The process of the invention provides granular detergent components having nonionic surfactant activities in excess of 50% by weight which deliver high performing nonionic surfactants to the wash. The process places still fewer restrictions on the viscosity characteristics of surfactant pastes that are suitable for processing into granular detergent components than the processes of the prior art.
SUMMARY OF THE INVENTION
The invention relates to a process for the manufacture of detergent compositions or components from a surfactant paste which is substantially in the solid phase at temperatures of 25.degree. C. and below, comprising the steps of: the surfactant paste comprising at least 50% by weight of nonionic surfactant; paste; and
In a preferred embodiment of the invention the surfactant paste further comprises anionic surfactant. In this embodiment the surfactant paste preferably comprises anionic surfactant and nonionic surfactant in a ratio of from 1:100 to 1:1, and furthermore, preferably has a water component of less than 15%, more preferably less than 10% by weight of the surfactant paste.
Suitable nonionic surfactants may be selected from the group consisting of ethoxylated nonionic surfactants, glycerol ethers, glucosamides, glycerol amides, glycerol esters, fatty acids, fatty acid esters, fatty amides, alkyl polyglucosides, alkyl polyglycol ethers, polyethylene glycols, ethoxylated alkyl phenols and mixtures thereof.
In particular a surfactant system comprising a mixture of polyhydroxy fatty acid amide and an ethoxylated nonionic surfactant in the ratio of from 3:7 to 7:3 is preferred.
In a particular embodiment of the invention, the molten surfactant paste is formed into drops by a continuous rotary drop former comprising outer and inner coaxial cylinders, both cylinders comprising a series of openings, at least one of the cylinders being rotatable. The molten surfactant drops are conveniently formed on a continuous steel cooling belt and, optionally, cooled by spraying a cooling liquid on to the opposite side of the belt to the side on which the drops are formed.
In a further aspect, the invention relates to granular detergent components or compositions comprising pastilles, the pastilles comprising at least 50% by weight of nonionic surfactant, characteristically have a generally
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Donoghue Scott John
Smith David John
Bolam Brian M.
Douyon Lorna M.
McGinty Douglas J.
Robinson Ian S.
The Procter & Gamble & Company
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