Effect of ethyl and n-octyl branches on the properties of poly(ethylene adipate) (PEA) and poly(butylene succinate) (PBS) were investigated. Glass transition and melting temperature, crystallinity, melt viscosity, and spherulite growth rate were decreased with an increase in the degree of the chain branches. Introduction of ethyl branches as well as n-octyl branches into PEA did not improve the tensile strength and modulus, while it reduced elongation and tear strength significantly. The presence of glycerol units less than 0.05 mol/mol of diacid units in PEA as well as in PSB also brought about damaging effects on the properties. Additional amount of glycerol units in the polyesters resulted in the formation of gel. However, addition of n-octyl branches improved elongation and tear strength of PBS considerably without a notable decrease of tensile strength and modulus.