Process for encapsulating particles using polymer latex
AssigneeLever Brothers Company
InventorsGamal I. Amer, Jeffrey N. Foster, Carmine P. Iovine
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Abstract
A process is disclosed for coating particles comprising suspending the particles in a fluidized bed and introducing therein an encapsulating latex. During introduction of the latex, the fluid bed must be maintained at a temperature which is within 10.degree. C. lower to 20.degree. C. higher than the glass transition temperature of the polymer. Typical core materials include halogen and peroxygen bleaches, bleach precursors, enzymes, colorants and fabric softeners. Preferably, the latex comprises water as a carrier and a polymer with carboxyl functionality, the polymer being insoluble in water.
Claims30
A method for forming a coherent, continuous coating around particles used in detergent compositions comprising:
- (i) suspending said particles in a fluidized bed;
- (ii) selecting a polymer to provide said coating having a glass transition temperature within 20.degree. C. lower to 10.degree. C. higher than an operating temperature of said fluidized bed, said polymer being alkali soluble but below pH 7 being water insoluble;
- (iii) introducing a latex into said particle containing bed, said latex comprising said polymer and a liquid carrier consisting of water wherein said polymer is insolubly dispersed, the polymer solids content of the latex ranging from greater than 30% to 60%;
- and
- (iv) maintaining said fluid bed during introduction of said latex at said operating temperature.
Dependencies are inferred from the claim text.