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§177.1555 聚芳烃酯树脂(Polyarylate resins)

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放大字体缩小字体2011-10-06 08:09:56 来源9a href="http://www.law.cornell.edu/cfr/text/21/177/1555" target="_blank" rel="nofollow">GPO浏览次数9span id="hits">3254
核心提示:聚芳烃酯树脂由双酚A和间苯二甲酸二苯酯熔融缩合而成。成品聚合物中衍生自间苯二甲酸二苯酯的量占聚合物重量?0%~80%,衍生自对苯二甲酸二苯酯的量占聚合物重量?0%~30%。聚芳烃酯树脂的最低平均分子质量为20000,聚芳烃酯树脂可根据其特征性红外光谱得以鉴定。厚度至少为0.5mm的片状成品聚芳烃酯树脂,用水?21℃下浸提2h,所得不挥发浸提物的量应不超过被浸提树脂表面?.33μg/cm2。本节还规定了聚芳烃酯树脂的使用限制条件、/div>
发布单位
FDA
FDA
发布文号 52 FR 35540
发布日期 1987-09-22 生效日期 暂无
有效性状?/th> 废止日期 暂无
备注 聚芳烃酯树脂由双酚A和间苯二甲酸二苯酯熔融缩合而成。成品聚合物中衍生自间苯二甲酸二苯酯的量占聚合物重量?0%~80%,衍生自对苯二甲酸二苯酯的量占聚合物重量?0%~30%。聚芳烃酯树脂的最低平均分子质量为20000,聚芳烃酯树脂可根据其特征性红外光谱得以鉴定。厚度至少为0.5mm的片状成品聚芳烃酯树脂,用水?21℃下浸提2h,所得不挥发浸提物的量应不超过被浸提树脂表面?.33μg/cm2。本节还规定了聚芳烃酯树脂的使用限制条件、/td>

177.1555 Polyarylate resins

  Polyarylate resins (CAS Reg. No. 51706-10-6 may be safely used as articles or components of articles intended for use in contact with food in accordance with the following prescribed conditions:

  (a Identity. Polyarylate resins ?, 3-benzenedicarboxylic acid, diphenyl ester, polymer with diphenyl 1,4-benzenedicarboxylate and 4-4-?-methylethylidine bis(phenol)) are formed by melt polycondensation of bisphenol-A with diphenylisophthalate and diphenylterephthalate.

  (b Specifications. ? The finished copolymers shall contain from 70 to 80 weight percent of polymer units derived from diphenylisophthalate and 20 to 30 weight percent of polymer units derived from diphenylterephthalate.

  ? Polyarylate resins shall have a minimum weight average molecular weight of 20,000.

  ? Polyarylate resins may be identified by their characteristic infrared spectra.

  (c Extractive limitations. The finished polyarylate resins in sheet form at least 0.5 millimeter ?.020 inch thick, when extracted with water at 121 C ?50 F for 2 hours, shall yield total nonvolatile extractives not to exceed 2.33 micrograms per square centimeter ?5 micrograms per square inch of the exposed resin surface.

  (d Limitations. Polyarylate resin articles may be used in contact with all foods except beverages containing more than 8 volume percent ethanol under conditions of use A through H, described in table 2 of 176.170(c of this chapter.

  [52 FR 35540, Sept. 22, 1987]

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