Polymer compositions or blends including natural rubber-based acrylonitrile butadiene styrene

摘要

In an embodiment, a natural rubber-based ABS—target polymer blend includes natural rubber-based ABS powder combined with a set of target polymers (e.g., polycarbonate (PC)). A natural rubber-based ABS powder production process includes producing grafted natural rubber; and mixing the grafted natural rubber with a set of grafted polybutadiene rubbers. The set of grafted polybutadiene rubbers includes at least one grafted polybutadiene rubber having a particle size that is significantly different than the grafted natural rubber particle size. In an embodiment, the grafted natural rubber exhibits a large particle size; a first grafted polybutadiene rubber exhibits a small particle size; and a second grafted polybutadiene rubber exhibits a medium particle size between the large and small particle sizes. Natural rubber-based ABS—target polymer blends in accordance with the present disclosure can exhibit generally equivalent or increased impact and/or tensile strength compared to other non-natural or synthetic rubber-based ABS blends.

主权项

1. A process for producing a composition including a set of polymers and a natural rubber-based acrylonitrile butadiene styrene (ABS) powder, the process comprising:
(a) producing the natural rubber-based ABS powder comprising:
(i) mixing a crosslinking agent with a portion of natural rubber to produce vulcanized natural rubber;(ii) mixing the vulcanized natural rubber with a monomer solution comprising styrene and acrylonitrile to produce grafted natural rubber having a grafted natural rubber particle diameter; and(iii) mixing the grafted natural rubber with a set of grafted polybutadiene rubbers to produce a latex masterbatch, the grafted natural rubber having a particle diameter corresponding to a large particle diameter, the set of grafted polybutadiene rubbers comprising a first grafted polybutadiene rubber having a first grafted polybutadiene rubber particle diameter and a second grafted polybutadiene rubber having a second grafted polybutadiene rubber particle diameter,wherein the first grafted polybutadiene rubber has a small particle diameter and the second grafted polybutadiene rubber has a medium particle diameter,wherein the small particle diameter is between 20%-90% smaller than the large particle diameter and the medium particle diameter exceeds the small particle diameter by between 15% and 85% of a difference between the large particle diameter and the small particle diameter, and (b) combining the natural rubber-based ABS powder with the set of polymers.