Polymer blends will continue to play a signifi cant role in the commercial development and application of plastic materials because of their desirable overall cost/performance balance and their ability to fi ll the performance gaps between existing single resins. In many cases, polymer blends have provided unique combination of properties and processability advantages not available in single resins. While further growth in commercial polymer blends will undoubtedly be strongly driven by specifi c market needs and applications, there are also several technological factors which can drive and sustain this growth. The following are some of the key technology factors that are likely to infl uence the future growth in commercial polymer blends: