C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
8/52
C11D 3/42 (2006.01)
Patent
CA 1135906
- 1 - Case 1-12163/1+2/= Process for the production of washing powders of stabilised or enhanced appearance which contain fluorescent whitening agents Abstract of the Disclosure The invention relates to the production of washing powders of stabilised or enhanced appearance which contain a fluorescent whitening agent of the formula Image or of the formula Image wherein R1 is hydrogen or chlorine, and M is hydrogen, an alkali metal or ammonium ion. The stabilising or enhancement of the appearance is effected by first dissolving or dispersing the fluorescent whitening agent in a mixture of water and a polyvinyl alcohol or polyvinyl pyrrolidone which is soluble or is able to swell in water, adding this solution or dispersion to the washing powder slurry and drying the slurry. The solution or dispersion can also be subsequently sprayed onto the dried residual washing powder. The appearance can be further enhanced by employing a poly- - 2 - ethylene glycol, a surfactant containing ethyleneoxy and/or propyleneoxy groups, and/or a cellulose ether, in addition to the polymer in the solution or dispersion. The solution or dispersion comprising fluorescent whitening agent and polymer can also alternatively be dried, preferably by spray drying, to produce a preparation which, after it has been suspended in water, can also be added to the washing powder slurry. The slurry is then dried, preferably by spray drying.
341546
Agarwal Suresh C.
Fringeli Werner
Gunter Franz
Lange Burkhart
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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