A method for modifying the properties of a nylon block copolymer comprising: supplying a nylon block copolymer wherein the nylon block copolymer has a flexural modulus, a tensile modulus, and an unnotched Izod impact strength. Incorporated into the nylon block copolymer is a nanoclay filler wherein the nanoclay filler is present at a level of between about 1.0-20.0 wt. %. The addition of the nanoclay filler serves to increase the values of the nylon block copolymer's flexural modulus, tensile modulus, while substantially maintaining the value of the unnotched Izod impact strength and/or increasing the value of said unnotched Izod impact strength, upon addition of the nanoclay filler.