Abstract: Thermoplastic polymer alloy compositions are provided comprising a blend of polypropylene, ethylene copolymer ionomer resin, ethylene/glycidyl acrylate or methacrylate copolymer, uncrosslinked ethylene propylene rubber, acid or anhydride grafted polypropylene, an agent for crosslinking the rubber and/or catalyzing an epoxide/acid reaction, and optionally a poly-.alpha.-olefin. The compositions are particularly useful for thermoforming of articles having high deep-draw ratios. The presence of the poly-.alpha.-olefin assists to improve embossing and grain retention of embossed sheets, particularly at high deep-draw ratios.