Process for preparing dynamically vulcanized alloys
AssigneeExxonMobil Chemical Patents Inc.
InventorsRonald DeYoung, Maria D. Ellul, Dennis Kumor, Ronald Keith Waters
Life of this patent
Estimating the term…
Abstract
This invention relates to the preparation of a dynamically vulcanized alloy comprising at least one elastomer and at least one thermoplastic resin. More specifically, the process produces dynamically vulcanized alloys with unique morphological features which have good impermeability and low temperature flexibility. In the process, the thermoplastic resin is added into the extruder in two stages with an intermediate addition of a compatibilizer. Also during the final addition of thermoplastic resin, the elastomeric curatives are added to the extruder.
Claims19
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 compatibilizer into the extruder;
- (d) mixing the elastomer, first portion of thermoplastic resin, and compatibilizer to begin interfacial grafting of the elastomer and 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 discrete particles in a matrix of the thermoplastic resin and the elastomer particle achieve at least 80% cure forming a dynamically vulcanized alloy.
Dependencies are inferred from the claim text.