Rohm and Haas Company

Karen Casey

Fanwen Zeng

Morris C Wills

Chuen-Shyong Chou

Joseph Robert Adamo

Morris Christopher Wills

Processes for preparing a powdery high rubber impact modifier containing two or more populations of polymer particles having a total rubbery weight fraction of greater than 90 weight percent is provided. Also provided are various methods of preparing aqueous polymer particle dispersions having two or more populations of polymer particles having a total rubbery weight fraction of greater than 90 weight percent. These dispersions are spray-driable into a powder and are useful for increasing the impact strength of various matrix resins.

Processes for preparing impact modifier powders

A powdery high rubber impact modifier composition containing two or more populations of polymer particles having a total rubbery weight fraction of greater than 90 weight percent is provided. Aqueous polymer particle dispersions for preparing these high rubber impact modifiers which can be spray dried to a powder are also provided. Also provided are polymeric compositions having a matrix resin component and the powdery high-rubber impact modifiers.

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Harleysville, PA, United States of America

Karen Casey