High efficiency impact modifiers and polymer compositions

The present invention relates to compositions of core-shell impact modifiers synthesized in a combination of unique concentric morphology and/or high rubber loading and low particle size and/or requiring only low surfactant levels, in particular those having a high Tg core, a low Tg inner shell and a high Tg outer shell. The incorporation of these impact modifiers into polymer compositions allows a new combination of properties: a combination of high impact strengths while maintaining high gloss, or a combination of high impact strengths while maintaining low haze in the presence of water at elevated temperatures. These impact modifiers also allow for excellent efficiency in use, thereby allowing excellent impact strength to be achieved at low loading. 本发明涉及以具有独特的同心形态和/或高橡胶负载量和低粒度的组合和/或仅需要低表面活性剂水平的方式合成的核-壳抗冲改性剂的组合物，特别是具有高Tg核、低Tg内壳和高Tg外壳的那些。将这些抗冲改性剂掺入聚合物组合物中允许新的性能组合：在保持高光泽度的同时具有高冲击强度的组合，或者在升高的温度下在水的存在下保持低雾度的同时具有高冲击强度的组合。这些抗冲改性剂还允许在使用中的优异效率，从而允许在低负载量下实现优异的冲击强度。