Encapsulated bleaches and methods for their preparation
AssigneeLever Brothers Company
InventorLouis R. Mazzola
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Abstract
Bleaching compositions containing coated or encapsulated bleaching agents, methods for employing these coated agents, as well as methods for preparing these encapsulates are disclosed. These compositions and methods are utilized to effectively bleach colored fabrics and textiles in both hot and cold water with minimal pinpoint damage to the fabric colors. The encapsulates have excellent storage properties and release of the active component at both hot and cold temperatures.
Claims6
A method for coating granulated agents, said agents being capable of substantially passing through a U.S. sieve size of about 10 mesh and at least about 80% of said agents being substantially retained on a U.S. sieve size of about 45 mesh comprising:
- (a) agitating said agents in a mixer sufficiently to insure thorough contact of a spray coating and continuing said agitation throughout said spray coating;
- and
- (b) spraying about 35% to about 55% of the total encapsulate weight of a melted solventless coating on said agents to form a coated agent, said spraying being accomplished initially at a rate and internal mixer temperature sufficient to agglomerate any fines present in the agent and after said agglomeration at a rate sufficiently low to prevent substantial further agglomeration of said agents and at an internal mixer temperature within the softening range of said coating, said coating consisting essentially of a major proportion of a fatty acid being substantially nonreactive with said agents and having a melting point range of about 85.degree. F. to about 135.degree. F., a plasticizing amount of a microcrystalline wax having a melting point range of about 125.degree. F. to about 210.degree. F.;
- and about 5% to about 20% by weight of the total encapsulate weight of a polyoxyethylenepolyoxypropylene copolymer having at least about 65% by weight of polyoxyethylene and having a molecular weight of about 8000 to about 16,500.
Dependencies are inferred from the claim text.