Compatible thermoplastic compositions based on polyesters and polycarbonates.

摘要

Polyester-based thermoplastic polymer compositions having improved impact strength and resistance to solvent action together with improved working stability comprise: a) an aromatic polycarbonate, b) an aromatic polyester, c) a polycarbonate-polyester block copolymer characterised by increased stability of the distribution and average dimension of the blocks in the molten state; said copolymer being obtained by mixing together in the molten state under controlled conditions a polycarbonate and a polyester, this latter obtained by a process catalysed by compounds of lanthanide group metals. These compositions demonstrate high compatibility between components a) and b) by the effect of the block copolymer, and manifest unusual structural and morphological stability even after repeated working in the molten state.