This　article　reports　experimental　data　related　to　the　research　article　entitled　“Poly(malic　acid-co-L-lactide)　as　a　Superb　Degradation　Accelerator　for　Poly(L-lactic　acid)　at　Physiological　Conditions”　(H.T.　Oyama,　D.　Tanishima,　S.　Maekawa,　2016)　[1].　Hydrolytic　degradation　of　poly(L-lactic　acid)　(PLLA)　blends　with　poly(aspartic　acid-co-L-lactide)　(PAL)　and　poly(malic　acid-co-L-lactide)　(PML)　oligomers　was　investigated　in　a　phosphate　buffer　solution　at　40 °C.　It　was　found　in　the　differential　scanning　calorimetry　measurements　that　upon　hydrolysis　the　cold　crystallization　temperature　(Tc)　and　the　melting　temperature　(Tm)　significantly　shifted　to　lower　temperature.　Furthermore,　the　hydrolysis　significantly　promoted　water　sorption　in　both　blends.　©　2016　The　Authors