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    • 85. 发明授权
    • Polyesters of 3-(para-hydroxyphenyl)propionic acid
    • 3-(对羟基苯基)丙酸的聚酯
    • US4354018A
    • 1982-10-12
    • US344548
    • 1982-02-01
    • Hans-G. EliasRobert J. Warner
    • Hans-G. EliasRobert J. Warner
    • C08G63/06C08G65/38
    • C08G63/06
    • A resinous linear polyester, poly(oxy-1,4-phenylene-3-oxotrimethylene), is made by the self-condensation of 3-(parahydroxyphenyl)propionic acid. The process is carried out interfacially or in an inert solvent by mixing 3-(parahydroxyphenyl)propionic acid with at least an equimolar proportion of thionyl chloride and maintaining the mixture at a reaction temperature for a time sufficient to allow substantially complete autocondensation. A base may be added in proportion at least about equivalent to the thionyl chloride. The autocondensate when purified is a white solid linear polyester not melting up to 360.degree. C. and may exhibit an intrinsic viscosity of at least 75 ml/g. It may be molded or pressed into a film.Co-condensed polyesters of 3-(parahydroxyphenyl)propionic acid with up to an equimolar proportion of parahydroxyphenylacetic acid may similarly be prepared.
    • 通过3-(对羟基苯基)丙酸的自缩合制备树脂线性聚酯,聚(氧-1,4-亚苯基-3-氧代三亚甲基)。 该方法在界面或惰性溶剂中通过将3-(对羟基苯基)丙酸与至少等摩尔比例的亚硫酰氯混合并将混合物保持在反应温度足以允许基本上完全自缩合的时间内进行。 碱可以以至少大约相当于亚硫酰氯的比例加入。 当纯化时的自缩聚物是白色固体线性聚酯,其未熔融至360℃,并且可以表现出至少75ml / g的特性粘度。 它可以被模塑或压制成膜。 可以类似地制备具有至多等摩尔比例的对羟基苯基乙酸的3-(对羟基苯基)丙酸的共缩合聚酯。