Acrylonitrile/styrene copolymer modified with butadiene/styrene elastomer identified in this section may be safely used as a component of bottles intended for use with foods identified in table I of Sec. 176.170(c) of this chapter as Type VI-B under conditions for use E, F, or G described in table 2 of Sec. 176.170(c) of this chapter.
(a) Identity. For the purpose of this section, acrylonitrile/styrene copoly- mer modified with butadiene/styrene elastomer consists of a blend of:
(1) 82-88 parts by weight of a matrix copolymer produced by polymerization of 77-82 parts by weight of acrylonitrile and 18-23 parts of styrene; and
(2) 12-18 parts by weight of a grafted rubber consisting of (i) 8-12 parts of butadiene/styrene elastomer containing 77-82 parts by weight of butadiene and 18-23 parts by weight of styrene and (ii) 4-6 parts by weight of a graft copolymer consisting of 70-77 parts by weight of acrylonitrile and 23-30 parts by weight of styrene.
(b) Adjuvants. The modified copoly-mer identified in paragraph (a) of this section may contain adjuvant substances required in its production. Such adjuvants may include substances generally recognized as safe in food, substances used in accordance with prior sanction, substances permitted under applicable regulations in this part, and the following: ------------------------------------------------------------------------
Substances Limitations------------------------------------------------------------------------n-Dodecylmercaptan........................ The finished copolymer shall
contain not more than 500
parts per million (ppm)
dodecylmercaptan as
dodecylmercapto-
propionitrile as determined
by the method titled,
``Determination of [beta]-
Dodecyl-
mercaptopropionitrile in NR-
16 Polymer,'' 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.------------------------------------------------------------------------
(c) Specifications. (1) Nitrogen content of the modified copolymer is in the range of 17.7-19.8 percent.
(1) Nitrogen content of the modified copolymer is in the range of 17.7-19.8 percent.
(2) Intrinsic viscosity of the matrix copolymer in butyrolactone is not less than 0.5 deciliter/gram at 35 C, as determined by the method titled ``Molecular Weight of Matrix Copolymer by Solution Viscosity,'' 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.
(3) Residual acrylonitrile monomer content of the modified copolymer articles is not more than 11 ppm as determined by a gas chromatographic method titled ``Determination of Residual Acrylonitrile and Styrene Monomers-Gas Chromatographic Internal Standard Method,'' 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.
(d) Extractives limitations. The following extractives limitations are determined by an infrared spectro photo metric method titled ``Infrared Spectro photo metric Determination of Polymer Extracted from Borex [supreg] 210 Resin Pellets,'' 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. Copies are applicable to the modified copolymers in the form of particles of a size that will pass through a U.S. Standard Sieve No. 6 and that will be held on a U.S. Standard Sieve No. 10:
(1) The extracted copolymer shall not exceed 2.0 ppm in aqueous extract obtained when a 100-gram sample of copolymer is extracted with 250 milliliters of freshly distilled water at reflux temperature for 2 hours.
(2) The extracted copolymer shall not exceed 0.5 ppm in n-heptane when a 100-gram sample of the basic copol-ymer is extracted with 250 milliliters spectral grade n-heptane at reflux temperature for 2 hours.
(e) Accelerated extraction end test. The modified copolymer shall yield acrylonitrile monomer not in excess of 0.4 ppm when tested as follows:
(1) The modified copolymer shall be in the form of eight strips \1/2\ inch by 4 inches by .03 inch.
(2) The modified copolymer strips shall be immersed in 225 milliliters of 3 percent acetic acid in a Pyrex glass pressure bottle.
(3) The pyrex glass pressure bottle is then sealed and heated to 150 F in either a circulating air oven or a thermostat controlled bath for a period of 8 days.
(4) The Pyrex glass pressure bottle is then removed from the oven or bath and cooled to room temperature. A sample of the extracting solvent is then withdrawn and analyzed for acrylonitrile monomer by a gas chromatographic method titled ``Gas-Solid Chromatographic Procedure for Determining Acrylonitrile Monomer in Acrylonitrile-Containing Polymers and Food Simulating Solvents,'' 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.
(f) Acrylonitrile copolymers identified in this section shall comply with the provisions of Sec. 180.22 of this chapter.
(g) Acrylonitrile copolymers identified in this section are not authorized to be used to fabricate beverage containers. [42 FR 14572, Mar. 15, 1977, as amended at 42 FR 48544, Sept. 23, 1977; 47 FR 11841, Mar. 19, 1982; 47 FR 16775, Apr. 20, 1982; 54 FR 24898, June 12, 1989] Sec. 177.1060 n-Alkylglutarimide/acrylic copolymers.
n-Alkylglutarimide/acrylic copolymers identified in this section may be safely used as articles or components of articles intended for use in contact with food subject to provisions of this section and part 174 of this chapter.
(a) Identity. For the purpose of this section, n-alkylglutarimide/acrylic copolymers are copolymers obtained by reaction of substances permitted by Sec. 177.1010(a) (1), (2), and (3) with the following substance: Monomethylamine (CAS Reg. No. 74-89-5), to form n-methylglutarimide/acrylic copolymers.
(b) Adjuvants. The copolymers identified in paragraph (a) of this section may contain adjuvant substances required in their production. The optional adjuvant substances required in the production of the basic polymer may include substances permitted for such use by applicable regulations, as set forth in part 174 of this chapter.
(c) Specifications. Maximum nitrogen content of the copolymer determined by micro-Kjeldahl analysis, shall not exceed 8 percent.
(d) Limitations. (1) The n-alkyl glutar imide/acrylic copolymers in the finished form in which they shall contact food, when extracted with the solvent or solvents characterizing the type of food and under the conditions of time and temperature described in tables 1 and 2 of Sec. 176.170(c) of this chapter, shall yield extractives not to exceed the limitations of Sec. 177.1010(b) of this chapter, when prepared as strips, as described in Sec. 177.1010(c)(2) of this chapter.
(1) The n-alkyl glutar imide/acrylic copolymers in the finished form in which they shall contact food, when extracted with the solvent or solvents characterizing the type of food and under the conditions of time and temperature described in tables 1 and 2 of Sec. 176.170(c) of this chapter, shall yield extractives not to exceed the limitations of Sec. 177.1010(b) of this chapter, when prepared as strips, as described in Sec. 177.1010(c)(2) of this chapter.
(2) The n-alkylglutarimide/acrylic copolymers shall not be used as polymer modifiers in vinyl chloride homo- or copolymers.
(e) Conditions of use. The n-alkylglutarimide/acrylic copolymers are used as articles or components of articles (other than articles composed of vinyl chloride homo- or copolymers) intended for use in contact with all foods except beverages containing more than 8 percent alcohol under conditions of use D, E, F, and G as described in table 2 of Sec. 176.170(c) of this chapter. [54 FR 20382, May 11, 1989, as amended at 58 FR 17098, Apr. 1, 1993]