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§177.2415 聚(芳醚酮)树脂(Poly(aryletherketone) resins)
2011-10-13 15:10  点击:3005
发布单位:FDA
发布文号:63 FR 20315
发布日期:1998-04-28
生效日期:暂无
有效性状态:
废止日期:暂无
备注:本节所指的聚(芳醚酮)树脂是聚(对氧亚苯基对氧亚苯基对羧基亚苯基)树脂,由对苯二酚和4,4'-二氟二苯酮聚合而得,用凝胶渗透色谱法测定,并与聚苯乙烯标准进行比较,最小重均相对分子质量为12000。所述的基本树脂可含有生产所需的辅料,这些辅料包括174.5(d)所述的物质以及二苯基砜。本节(c)规定了浸提物限量指标。

    §177.2415 Poly(aryletherketone) resins


      Poly(aryletherketone) resins identified in paragraph (a) of this section may be safely used as articles or components of articles intended for repeated use in contact with food subject to the provisions of this section.

  (a) Identity. For the purposes of this section, poly(aryletherketone) resins are poly(p -oxyphenylene p -oxyphenylene p -carboxyphenylene) resins (CAS Reg. No. 29658-26-2) produced by the polymerization of hydroquinone and 4,4′-difluorobenzophenone, and have a minimum weight-average molecular weight of 12,000, as determined by gel permeation chromatography in comparison with polystyrene standards, and a minimum mid-point glass transition temperature of 142 °C, as determined by differential scanning calorimetry.

  (b) Optional adjuvant substances. The basic resins identified in paragraph (a) may contain optional adjuvant substances used in their production. These adjuvants may include substances described in § 174.5(d) of this chapter and the following:

Substance Limitations
Diphenyl sulfone Not to exceed 0.2 percent by weight as a residual solvent in the finished basic resin.


  (c) Extractive limitations. The finished food contact article, when extracted at reflux temperatures for 2 hours with the following four solvents, yields in each extracting solvent net chloroform soluble extractives not to exceed 0.05 milligrams per square inch of food contact surface: Distilled water, 50 percent (by volume) ethanol in distilled water, 3 percent acetic acid in distilled water, and n -heptane. In testing the final food contact article, a separate test sample shall be used for each extracting solvent.

    [63 FR 20315, Apr. 24, 1998]

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下一篇:§177.2420 交联聚酯树脂(Polyester resins, cross-linked)
上一篇:§177.2410 用于模制品的酚醛树脂(Phenolic resins in molded articles)
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