Encapsulated particle

A method of encapsulating a core particle, said method comprising the steps of:

• A. providing a core particle;
• B. providing a monomeric and/or polymeric methylene diphenyl diisocyanate;
• C. providing a polyol component comprising;
• a. a catalytic polyol derived from an aromatic amine-based initiator, and
• b. a polyether polyol that is different from the catalytic polyol;
• E. providing a wax;
• F. mixing and reacting the monomeric and/or polymeric methylene diphenyl diisocyanate and the polyol component to form a polyurethane;
• G. encapsulating the core particle with a polyurethane layer which comprises the polyurethane;
• and
• H. encapsulating the polyurethane layer with a wax layer comprising the wax, the wax present in an amount of from 0.5 to 3.0% by weight based on the total weight of the core particle,
• wherein the weight ratio of the catalytic polyol to the polyether polyol of the polyol component is from about 1:2 to about 10:1;
• and
• wherein the core particle has a dissolution of less than 60% by weight after 7 days of aging the encapsulated particle in water at 38° C.

A system for encapsulating a core particle with a polyurethane layer and a wax layer, said system comprising:

• A. a monomeric and/or polymeric methylene diphenyl diisocyanate;
• and
• B. a polyol component comprising:
• i. a catalytic polyol derived from an aromatic amine-based initiator comprising the formula:
• wherein R1 comprises one of an alkyl group, an amine group, and a hydrogen;
• and
• wherein each of R2-R6 independently comprise one of an amine group and
• a hydrogen, so long as at least one of R1-R6 is an amine group, and
• ii. a polyether polyol that is different from said catalytic polyol;
• wherein the weight ratio of said catalytic polyol to said polyether polyol of said polyol component is from about 1:2 to about 10:1;
• wherein said wax layer comprises a present in amount of from 0.5 to 3.0% by weight based on the total weight of said core particle;
• and
• wherein said core particle has a dissolution of less than 60% by weight after 7 days of aging the encapsulated particle in water at 38° C.