THERMOPLASTIC POLYMER FOR PLASTIC COMPONENTS FOR PUMPS

摘要

The invention relates to a block copolymer comprising hard segments and soft segments, wherein the copolymer comprises 20-42 wt.% of hard segments consisting of repeat units of a semi-crystalline semi-aromatic polyester, and 58-80 wt.% of soft segments consisting of repeat units of an amorphous polyamide, and wherein the weight percentages (wt.%) are relative to the total weight of the copolymer, the soft segments have a number average molecular weight (Mn) of 1750-3000, and the soft segments contain polymerization residues of a dimerised fatty acid and/or a dimerised fatty diamine and optionally other aliphatic dicarboxylic acids or other aliphatic diamines.