This article studies the mechanical properties of PA6 reinforced polymer blends comprised of a soft PMMA matrix. These composites are designed as a model system to investigate the impact of the content of the two phases on the composite mechanical properties. The addition of the PA6 phase to the matrix PMMA increases the strength of the blend, but lowers its toughness as it decreases the elongation at break. When PA6 particles are added the blends become relatively brittle. The composites containing moderate content of PA6 particles show enhanced tensile modulus and strength. This enhancement is associated with the formation of a network within the polymeric matrix comprised of PA6 particles welded together by the minor component.