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    • 5. 发明授权
    • Process for increasing the rate of crystallization of polyesters
    • 提高聚酯结晶速率的方法
    • US4401792A
    • 1983-08-30
    • US358834
    • 1982-03-16
    • Robert J. AxelrodFrank N. LibertiJohn Semen
    • Robert J. AxelrodFrank N. LibertiJohn Semen
    • C08K5/098C08L67/02C08F8/00
    • C08K5/098C08L67/02
    • A process is provided for increasing the rate of crystallization of polyester compounds, such as poly (alkylene arylates), more particularly poly(alkylene terephthalates), or blends or mixtures thereof, as for example, poly(ethylene terephthalate), poly(butylene terephthalate) or mixtures of blends thereof, by incorporating therein a small amount of a polyethylene ionomer, or an alkali metal salt of benzoic acid, such as sodium benzoate. The faster crystallization rates improve injection molding performance of the polyesters and blends thereof, such as reduced post-mold shrinkage, faster mold cycle times and lower mold temperature. Also, the resultant products show increases in physical properties such as flex modulus, flex strength, deflection temperature under load (DTUL), tensile strength and solvent resistance. The process is applicable not only to unfilled polyester compounds but also to mineral or glass-filled, or fire-retardant-containing compounds, to impact modified polyesters, as well as blends of polyesters, such as poly(ethylene terephthalate)/poly(butylene terephthalate) (PET/PBT) blends, unfilled and filled with the aforesaid components.
    • 提供了一种提高聚酯化合物如聚(亚烷基芳基化物),更特别是聚(对苯二甲酸亚烷基酯)或其共混物或混合物的结晶速率的方法,例如聚对苯二甲酸乙二醇酯,聚对苯二甲酸丁二醇酯 )或其混合物的混合物,其中加入少量的聚乙烯离聚物或苯甲酸的碱金属盐,例如苯甲酸钠。 更快的结晶速率提高了聚酯及其共混物的注射成型性能,例如缩短后模收缩率,更快的模具循环时间和降低模具温度。 此外,所得产物显示物理性能如挠曲模量,挠曲强度,载荷下的挠曲温度(DTUL),拉伸强度和耐溶剂性的增加。 该方法不仅适用于未填充的聚酯化合物,而且适用于矿物或玻璃填充或含阻燃剂的化合物,以冲击改性聚酯,以及聚酯的共混物,例如聚对苯二甲酸乙二醇酯/聚(丁烯 对苯二甲酸酯)(PET / PBT)混合物,未填充并填充上述组分。