Encapsulated particle

摘要

An encapsulated particle includes a core particle and a polyurethane disposed about the core particle. The polyurethane includes the reaction product of an aromatic isocyanate component and a polyol component. The polyol component includes a polyol derived from an aromatic amine-based initiator and an aliphatic polyether polyol. The polyol derived from the aromatic amine-based initiator has a nominal functionality of 4. The aliphatic polyether polyol has a nominal functionality of from 2 to 4. The weight ratio of the polyol derived from the aromatic amine-based initiator and the aliphatic polyether polyol is from about 1:2 to 2:1. A method of forming the encapsulated particle is also provided.

主权项

1. An encapsulated particle comprising:
a core particle; and a polyurethane disposed about said core particle and comprising the reaction product of an aromatic isocyanate component having a nominal functionality of at least 2 and a polyol component; wherein said aromatic isocyanate component is utilized in an amount of from about 20 to 60 wt. % based on the total weight of said aromatic isocyanate component and said polyol component, and wherein said polyol component is utilized in an amount of from about 40 to 80 wt. % based on the total weight of said aromatic isocyanate component and said polyol component, and wherein said polyol component comprises;
a polyol derived from an aromatic amine-based initiator and having a nominal functionality of 4, andan aliphatic polyether polyol having a nominal functionality of from 2 to 4,wherein the weight ratio of said polyol derived from said aromatic amine-based initiator and said aliphatic polyether polyol is from about 1:2 to 2:1.