Impact modifier compositions and applications thereof

An impact modifier composition consisting essentially of:

• (a) 10 to 90 wt. % of a polyolefin plastomer having a density of >0.885 g/cc, measured according to ASTM D792, and a melt flow rate of 0.1 to 30 dg/min at 230° C. with 2.16 kg load, measured according to ASTM D1238;
• and
• (b) 10 to 90 wt. % of a hydrogenated styrenic block copolymer having a general configuration selected from:
• S-S/EB, S-S/EB′, S-S/EB-EB′, S-S/EB′-EB, S-S/EB-S, S-S/EB′-S, S-EP-EB, S-EP-EB′, S-EB-EB′, S-EB′-EB, EB-S/EB-EB, EB′-S/EB-EB′, EB-S/EB′-EB, and mixtures thereof,
• wherein prior to hydrogenation:
• each block S is a polymer block of a vinyl aromatic monomer,
• each block EB is a polybutadiene block of 1,3-butadiene monomer having a vinyl content of <35 wt. %,
• each block EB′ is a polybutadiene block of 1,3-butadiene monomer having a vinyl content of >35 wt. %,
• each block EP is a polyisoprene block of isoprene monomer, and
• each block S/EB and S/EB′, independently, is a copolymer block of a vinyl aromatic monomer and 1,3-butadiene monomer,
• wherein the hydrogenated styrenic block copolymer has a polystyrene content of 3 to 40 wt. %.