the invention relates to blends of polyolefins and a biodegradable polymer , such as polylactic acid and polyhydroxy butyrate , which are compatabilized by a functionalized olefin acrylic copolymer . since pla and polyolefins are not miscible , the use of the compatibilzer improves the compatibility , thereby improving the processability , and particularly the melt strength and melt elasticity . useful compatibilizers include lotader ® and lotryl ® copolymers from arkema , inc . the blend composition may optionally contain one or more acrylic copolymers as impact modifiers or process aids .