Patent ID: 9546251
Date: 2017-01-17
CPC Classifications: B29C,B29K,C08J,C08L

Claim:
1. A process for producing a dynamically vulcanized alloy, the alloy comprising at least one elastomer and at least one thermoplastic resin, the process comprising the following consecutive steps of: a) feeding the elastomer and a first portion of the thermoplastic resin into the initial feed throat of an extruder; b) mixing the elastomer and the first portion of thermoplastic resin; c) feeding a compatibilizer into the extruder; d) mixing the elastomer, the first portion of thermoplastic resin, and the compatibilizer to begin interfacial grafting of the elastomer with the thermoplastic resin without any significant curing of the elastomer; e) feeding a second portion of the thermoplastic resin into the extruder; and f) subsequent to the interfacial grafting, mixing the contents of the extruder under shear conditions to mix and cure the elastomer until the elastomer is dispersed as particles in a matrix of the thermoplastic resin and the elastomer particles achieve at least 80% cure forming a dynamically vulcanized alloy wherein the average elastomeric particle size for the majority of the elastomeric particles is defined by a diameter in the range of 100 to 1,000 nanometers; wherein the alloy has an elastomer shear modulus, G′, at 1% strain and 100° C. as determined according to ASTM D7605 of about 4,500 to about 7,500 kPa.