HIGHLY EFFICIENT IMPACT MODIFIER AND POLYMERIC COMPOSITIONS

The invention relates to the composition of core-shell impact modifiers, in particular those with a high Tg core, a low Tg inner shell and a high Tg outer shell, synthesized in such a way to have a unique concentric morphology and/or a combination of high rubber loading and low particle size and/or require only a low surfactant level. The incorporation of these impact modifiers into polymeric compositions allows for a novel combination of high impact while retaining high gloss or a combination of high impact while retaining low haze in the presence of water at elevated temperatures. These impact modifiers also allow excellent efficiency in their use- allowing for excellent impact to be achieved at low loadings.