A polyester or polyesteramide capable of forming an anisotropic melt containing residues derived from dicarboxylic acids, dihydric phenols, hydroxyaromatic acids and aminophenols characterised in that at least 10 mole % of the acid residues of the polymer are radicals derived from fumaric acid or a substituted fumaric acid. Preferably at least 10 mole % of the residues other than the residues of fumaric acid or substituted fumaric acid are aromatic ring-substituted residues. The polyester or polyesteramides of the invention are particularly suitable for blending with chlorine-containing polymers at concentrations of up to 25% by weight of the polymer blend to improve the processability of the chlorine-containing polymer. A polyester in which the acid residues are entirely aliphatic is particularly suitable for blending with poly(vinyl chloride).
一种能形成各向异性熔体的聚酯或聚酯酰胺,含有二
羧酸、二
水合
酚、羟基芳香族酸和
氨基苯酚的残基,其特征在于聚合物中至少 10 摩尔%的酸残基是
富马酸或取代
富马酸的自由基。除
富马酸或取代
富马酸残基外,最好至少有 10 摩尔%的残基是芳香环取代残基。本发明的聚酯或聚酯酰胺特别适用于与含
氯聚合物共混,共混浓度最高可达聚合物重量的 25%,以改善含
氯聚合物的加工性。酸残基完全为脂肪族的聚酯尤其适合与聚
氯乙烯共混。