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§177.1960 氯乙?1-己烯共聚?Vinyl chloride-hexene-1 copolymers)

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放大字体缩小字体2011-10-12 07:28:37 来源9a href="http://www.law.cornell.edu/cfr/text/21/177/1960" target="_blank" rel="nofollow">GPO浏览次数9span id="hits">2326
核心提示:氯乙烯/1-己烯共聚物,是由氯乙烯和1-己烯共聚后制成的基本共聚物组成。成品共聚物中来?-己烯的量不超过共聚物重量?%(摩尔分数),并符合本节(b)中所规定的质量指标和浸提物限量。本成品共聚物中可不加限制地含有羟丙基甲基纤维素和三氯乙烯,在共聚物的生产中分别用做悬浮剂和链转移剂。本节还规定了氯乙烯/1-己烯共聚物的质量指标和限制条件、/div>
发布单位
FDA
FDA
发布文号 49 FR 10110
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 氯乙?1-己烯共聚物,是由氯乙烯和1-己烯共聚后制成的基本共聚物组成。成品共聚物中来?-己烯的量不超过共聚物重量?%(摩尔分数),并符合本节(b)中所规定的质量指标和浸提物限量。本成品共聚物中可不加限制地含有羟丙基甲基纤维素和三氯乙烯,在共聚物的生产中分别用做悬浮剂和链转移剂。本节还规定了氯乙烯/1-己烯共聚物的质量指标和限制条件、/td>

  177.1960 Vinyl chloride-hexene-1 copolymers.


  The vinyl chloride-hexene-1 copolymers identified in paragraph (a of this section or as components of articles intended for use in contact with food, under conditions of use D, E, F, or G described in table 2 of 176.170(c of this chapter, subject to the provisions of this section.

  (a Identity. For the purposes of this section vinyl chloride-hexene-1 copolymers consist of basic copolymers produced by the copolymerization of vinyl chloride and hexene-1 such that the finished copolymers contain not more than 3 mole-percent of polymer units derived from hexene-1 and meet the specifications and extractives limitations prescribed in paragraph (b of this section. The copolymers may optionally contain hydroxypropyl methyl-cellulose and trichloroethylene used as a suspending agent and chain transfer agent, respectively, in their production.

  (b Specifications and limitations. The vinyl chloride-hexene-1 basic copolymers meet the following specifications and extractives limitations:

  ? Specifications. (i Total chlorine content is 53 to 56 percent as determined by any suitable analytical procedure of generally accepted applicability.

  (ii Inherent viscosity in cyclohexanone at 30 C is not less than 0.59 deciliters per gram as determined by ASTM method D1243-79, Standard Test Method for Dilute Solution Viscosity of Vinyl Chloride Polymers, 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.

  ? Extractives limitations. The following extractives limitations are determined by the methods prescribed in 177.1970(d?

  (i Total extractives do not exceed 0.01 weight percent when extracted with water at 150 F for 2 hours.

  (ii Total extractives do not exceed 0.30 weight percent when extracted with n -heptane at 150 F for 2 hours.

  (c Other specifications and limitations. The vinyl chloride-hexene-1 copolymers identified in and complying with this section, when used as components of the food-contact surface of any article that is subject to a regulation in parts 174, 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.

  [42 FR 14572, Mar. 15, 1977, as amended at 49 FR 10110, Mar. 19, 1984]

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