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§177.1560 聚芳基砜树脂(Polyarylsulfone resins)

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放大字体  缩小字体 2011-10-06 20:29:21  来源:GPO  浏览次数:2737
核心提示:聚芳基砜树脂是含有不超过25%的氧-对-亚苯基-氧-对-亚苯基磺酰-对亚苯基聚合物和不低于75%的氧-对-亚苯基磺酰-对-亚苯基-氧-亚苯基磺酰-对-亚苯基聚合单元的共聚物。可添加辅助物质,这些物质包括本章170至179部分中规定允许使用的物质,在食品中一般公文为安全的物质,按过去已公布的法规中允许使用的物质,以及四氧噻吩砜。本节还规定了浸提物的限量。
发布单位
FDA
FDA
发布文号 50 FR 31046
发布日期 1985-07-24 生效日期 暂无
有效性状态 废止日期 暂无
备注 聚芳基砜树脂是含有不超过25%的氧-对-亚苯基-氧-对-亚苯基磺酰-对亚苯基聚合物和不低于75%的氧-对-亚苯基磺酰-对-亚苯基-氧-亚苯基磺酰-对-亚苯基聚合单元的共聚物。可添加辅助物质,这些物质包括本章170至179部分中规定允许使用的物质,在食品中一般公文为安全的物质,按过去已公布的法规中允许使用的物质,以及四氧噻吩砜。本节还规定了浸提物的限量。

§177.1560 Polyarylsulfone resins


  Polyarylsulfone resins (CAS Reg. No. 79293-56-4) may be safely used as articles or components of articles intended for use in contact with food, at temperatures up to and including normal baking temperatures, in accordance with the following prescribed conditions:

  (a) Identity. Polyarylsulfone resins are copolymers containing not more than 25 percent of oxy-p -phenylene-oxy-p -phenylenesulfonyl-p- phenylene polymer units and not less than 75 percent of oxy-p -phenylenesulfonyl-p -phenylene-oxy-p -phenylenesulfonyl-p -phenylene polymer units. The copolymers have a minimum reduced viscosity of 0.40 deciliter per gram in 1-methyl-2-pyrrolidinone in accordance with ASTM method D2857-70 (Reapproved 1977), “Standard Test Method for Dilute Solution Viscosity of Polymers,” which is incorporated by reference. Copies may be obtained from the American Society for Testing and Materials, 100 Barr Harbor Dr., West Conshohocken, Philadelphia, PA 19428-2959, or may be examined at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.

  (b) Optional adjuvant substances. The basic polyarylsulfone resins identified in paragraph (a) of this section may contain optional adjuvant substances required in the production of such basic copolymers. These optional adjuvant substances may include substances permitted for such use by regulations in parts 170 through 179 of this chapter, substances generally recognized as safe in food, substances used in accordance with a prior sanction of approval, and substances named in this paragraph and further identified as required:

 

Substances Limitations
Sulfolane Not to exceed 0.15 percent as residual solvent in the finished basic resin.


  (c) Extractive limitations. The finished polyarylsulfone resin when extracted for 2 hours with the following solvents at the specified temperatures yields total extractives in each extracting solvent not to exceed 0.008 milligram per square centimeter of food-contact surface: distilled water at 121 °C (250 °F), 50 percent (by volume) ethyl alcohol in distilled water at 71.1 °C (160 °F), 3 percent acetic acid in distilled water at 100 °C (212 °F), and n- heptane at 65.6 °C (150 °F).

    Note: In testing the finished poly-aryl-sulfone resin use a separate test sample for each required extracting solvent.

    [50 FR 31046, July 24, 1985]

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