Patent ID: 8003747

Claim:
A method of making a cross-linked thermoplastic polyurea comprising the steps of: heating a dry mixture to a temperature within the range of 250° F. to 550 ° F. within a mixing barrel to created a heated partially cross-linked mixture, the dry mixture comprising a thermoplastic urethane base material, a di-isocyanate comprising between 1 to 10% of the total weight of the mixture, the di-isocyanate being one of monomeric or polymeric, and a diamine comprising between 1 to 10% of the total weight of the mixture, the diamine selected from the group consisting of 4, 4′ methylene-bis-(3-chloro-2, 6-diethylaniline) and 4, 4′ methylene-bis-(2, 6-diethylaniline); injecting the heated partially cross-linked mixture into at least one injection mold cavity; and curing the injected material at a temperature between 150° F. to 250° F. for a period of time between 2 and 36 hours.