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§177.1635 聚(对甲基苯乙烯)和用橡胶改性的聚(对甲基苯乙烯?

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放大字体缩小字体2011-10-11 03:51:46 来源9a href="http://www.law.cornell.edu/cfr/text/21/177/1635" target="_blank" rel="nofollow">GPO浏览次数9span id="hits">2504
核心提示:本节中所规定的聚(对甲基苯乙烯)和用橡胶改性的聚(对甲基苯乙烯)是基本聚合物。按本节(a)(1)(2)所规定的条件生产。聚(对甲基苯乙烯)聚合物由对甲基苯乙烯聚合而成。用橡胶改性的聚(对甲基苯乙烯)由苯乙?丁二烯共聚物,和或聚丁二烯与聚(对甲基苯乙烯)共同结合而成。可选辅料为本章规定的物质,在食品中公认为安全的物质,在间接添加剂中公认为安全的物质。本节(c)规定了聚(对甲基苯乙烯)和用橡胶改性的聚(对甲基苯乙烯)的质量指标、/div>
发布单位
FDA
FDA
发布文号 55 FR 52989
发布日期 1990-12-26 生效日期 暂无
有效性状?/th> 废止日期 暂无
备注 本节中所规定的聚(对甲基苯乙烯)和用橡胶改性的聚(对甲基苯乙烯)是基本聚合物。按本节(a)(1)(2)所规定的条件生产。聚(对甲基苯乙烯)聚合物由对甲基苯乙烯聚合而成。用橡胶改性的聚(对甲基苯乙烯)由苯乙?丁二烯共聚物,和或聚丁二烯与聚(对甲基苯乙烯)共同结合而成。可选辅料为本章规定的物质,在食品中公认为安全的物质,在间接添加剂中公认为安全的物质。本节(c)规定了聚(对甲基苯乙烯)和用橡胶改性的聚(对甲基苯乙烯)的质量指标、/td>

177.1635 Poly(p-methylstyrene and rubber-modified poly(p-methyl-styrene?


   Poly(p -methylstyrene and rubber-modified poly(p -methylstyrene identified in this section may be safely used as components of articles intended for use in contact with food, subject to the provisions of this section:

  (a Identity. For the purposes of this section, poly(p -methylstyrene and rubber-modified poly(p -methylstyrene are basic polymers, manufactured as described in this paragraph, meeting the specifications prescribed in paragraph (c of this section.

  ? Poly(p -methylstyrene (CAS Reg. No. 24936-41-2 polymer produced by the polymerization of p -methylstyrene.

  ? Rubber-modified poly(p -methylstyrene (CAS Reg. No. 33520-88-6 polymer produced by combining styrene-butadiene copolymer and/or polybutadiene with poly(p -methylstyrene? either during or after polymerization of the poly(p -methylstyrene? such that the finished polymers contain not less than 75 weight percent of total polymer units derived from p -methylstyrene monomer.

  (b Optional adjuvants. The basic polymers identified in paragraph (a of this section may contain optional adjuvant substances required in the production of such basic polymers. Such optional adjuvant substances may include substances permitted for such use by applicable regulations in this chapter, substances generally recognized as safe in food, substances generally recognized as safe in indirect additives, and substances used in accordance with prior sanction or approval.

  (c Specifications. ? Poly(p -methylstyrene basic polymers identified in paragraph (a)(1 of this section shall contain not more than 1 weight percent of total residual p -methystyrene monomer, as determined by a gas chromatographic method titled, Gas Chromatographic Determination of PMS and PET in PPMS Basic Polymers, which is incorporated by reference. Copies are available from the Center for Food Safety and Applied Nutrition (HFS-200? Food and Drug Administration, 5100 Paint Branch Pkwy., College Park, MD 20740, or available for inspection 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.

  ? Rubber-modified poly(p -methylstyrene basic polymers identified in paragraph (a)(2 of this section shall contain not more than 0.5 weight percent of total residual p -methylstyrene monomer, as determined by the method identified in paragraph (c)(1 of this section

  (d Other specifications and limitations. The poly(p -methylstyrene and rubber-modified poly(p -methylstyrene identified in and complying with this section, when used as components of the food-contact surface of any article that is the subject of a regulation in parts 175, 176, 177, 178 and 179.45 of this chapter, shall comply with any specifications and limitations prescribed by such regulation for the article in the finished form in which it is to contact food.

  (e Conditions of use. Poly(p -methylstyrene basic polymers and rubber-modified poly(p -methylstyrene basic polymers identified in paragraphs (a)(1 and (a)(2? respectively, of this section shall be used in contact with food only under conditions of use B through H set forth in table 2 of 176.170(c of this chapter.

  Code of Federal Regulations

  [48 FR 31384, July 8, 1983, as amended at 54 FR 24898, June 12, 1989; 55 FR 52989, Dec. 26, 1990]

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