Coating processes – Particles – flakes – or granules coated or encapsulated
Patent
1986-08-22
1988-01-26
Lusignan, Michael R.
Coating processes
Particles, flakes, or granules coated or encapsulated
25217423, 25217424, B05D 700
Patent
active
047216336
ABSTRACT:
A process is described in which a particulate detergent composition which is speckled in appearance is made by spraying an aqueous coloring medium, such as dye solution, containing polyacrylic acid, onto the surface of a moving bed of detergent composition particles containing an alkaline builder, thereby forming a coherent colored surface section or "skin" of detergent composition particles. The coherent section or skin of particles is next broken up and the colored particles are mixed with uncolored particles from the bed to make the speckled detergent composition. Normally, the bed of detergent composition particles is on a moving conveyer belt, which conveyer belt is preferably a weigh-belt, and the amount of coloring medium being sprayed onto the moving bed is automatically regulated by the weight of detergent composition particles on the belt passing under the spray nozzle(s), and the belt speed. It is an important feature of the described process that the aqueous coloring medium colors only a top portion of the particles in the moving bed and yet, such coloring of such particles is complete, with few, if any, uncolored areas on any of the colored particles. Also important is the quick reaction of the polyacrylic acid with the alkaline component(s) of the detergent composition beads, to form a polyacrylate coating on each of the beads, which holds moisture from the spray solution, so that drying is not required, and also acts to seal the surfaces of the colored particles and hold the colorant in the particles, inhibiting migration of colorant from the colored particles to contacting uncolored particles during transportation and storage of the speckled detergent compositions.
REFERENCES:
patent: 3509059 (1970-04-01), Renold
patent: 3989635 (1976-11-01), Toyoda et al.
patent: 4162228 (1979-07-01), Robles
Colgate-Palmolive Company
Grill M. M.
Lieberman B.
Lusignan Michael R.
Sylvester H. S.
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