Disclosed herein is a silicone-acrylate impact modifier composition, where
the impact modifier composition comprises structural units derived from:
at least one silicone rubber monomer, a branched acrylate rubber monomer
having the formula: ##STR00001## wherein R.sup.1 is selected from
hydrogen and C.sub.1-C.sub.8 linear and branched hydrocarbyl groups,
R.sup.2 comprises a branched C.sub.3-C.sub.16 hydrocarbyl group; and "z"
is greater than or equal to 3; a first graft link monomer; a
polymerizable alkenyl-comprising organic material; and a second graft
link monomer The silicone-acrylate impact modifier compositions disclosed
herein are useful for making molding compositions, which are useful for
producing various articles, especially for outdoor applications.