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§177.1590 聚酯高弹性体(Polyester elastomers)

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放大字体缩小字体2011-10-06 09:47:59 来源9a href="http://www.law.cornell.edu/cfr/text/21/177/1590" target="_blank" rel="nofollow">GPO浏览次数9span id="hits">2748
核心提示:本节所指的聚酯高弹性体是由苯二甲酸酯和/?,4-丁二醇进行酯交换反应而得,高弹性体成品的数均分子量?0000-30000之间。可供选用的辅料为获得希望的工艺或物理性质而用于聚酯高弹性体生产或加入聚酯高弹性体中的辅料包括4,4?二(α。?二甲基苄基)二苯胺。按ASTM方法用降蚀试验仪对有机涂层的耐磨标准测试法测定与食品接触的聚酯高弹性体产品的适当试样,惟用No.50金刚砂磨料替代渥太华沙,其耐磨系数不得低于100L/0.0254mm厚度、/div>
发布单位
FDA
FDA
发布文号 49 FR 10109
发布日期 1984-03-19 生效日期 暂无
有效性状?/th> 废止日期 暂无
备注 本节所指的聚酯高弹性体是由苯二甲酸酯和/?,4-丁二醇进行酯交换反应而得,高弹性体成品的数均分子量?0000-30000之间。可供选用的辅料为获得希望的工艺或物理性质而用于聚酯高弹性体生产或加入聚酯高弹性体中的辅料包括4,4?二(α。?二甲基苄基)二苯胺。按ASTM方法用降蚀试验仪对有机涂层的耐磨标准测试法测定与食品接触的聚酯高弹性体产品的适当试样,惟用No.50金刚砂磨料替代渥太华沙,其耐磨系数不得低于100L/0.0254mm厚度、/td>

177.1590 Polyester elastomers


  The polyester elastomers identified in paragraph (a of this section may be safely used as the food-contact surface of articles intended for use in contact with bulk quantities of dry food of the type identified in 176.170(c of this chapter, table 1, under Type VIII, in accordance with the following prescribed conditions:

  (a For the purpose of this section, polyester elastomers are those produced by the ester exchange reaction when one or more of the following phthalatesdimethyl terephthalate, dimethyl orthophthalate, and dimethyl isophthalateis made to react with alpha-hydroomega-hydroxypoly (oxytetramethylene and/or 1,4- butanediol such that the finished elastomer has a number average molecular weight between 20,000 and 30,000.

  (b Optional adjuvant substances employed in the production of the polyester elastomers or added thereto to impart desired technical or physical properties may include the following substances:

List of substances Limitations
4,4 - Bis (alpha, alpha-dimethyl-benzyl) diphenylamine For use only as an antioxidant.
Tetrabutyl titanate For use only as a catalyst.

  (c An appropriate sample of the finished polyester elastomer in the form in which it contacts food when subjected to ASTM method D968-81, Standard Test Methods for Abrasion Resistance of Organic Coatings by the Falling Abrasive Tester, which is incorporated by reference (Copies may be obtained from the American Society for Testing 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. ? using No. 50 emery abrasive in lieu of Ottawa sand, shall exhibit an abrasion coefficient of not less than 100 liters per mil of thickness.

    [42 FR 14572, Mar. 15, 1977, as amended at 49 FR 10109, Mar. 19, 1984]

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