Thermoplastic Polymer Blends Comprising Crosslinked Polar Olefin Polymers in a Thermoplastic Polyurethane Matrix

A method of making a polymer blend, the method comprising:

• (a) mixing a thermoplastic polyurethane polymer, a metal hydroxide, and an organic flame retardant to form a first resin composition;
• (b) mixing a polar olefin polymer, the metal hydroxide, a silane coupling agent and a peroxide crosslinking agent at a temperature above the melting temperature of the polar olefin polymer, but below the decomposition temperature of the peroxide coupling agent to form a second resin composition;
• and
• (c) compounding the first resin composition and the second resin composition at a temperature at which the peroxide crosslinking agent decomposes and crosslinks the polar olefin polymer with continuous mixing to form a dispersed or co-continuous phase comprising the crosslinked polar olefin polymer and the metal hydroxide in a continuous phase comprising the thermoplastic polyurethane and the metal hydroxide.