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177.1050 Acrylonitrile/styrene copoly-mer modified with butadiene/styrene elastomer.

Home > Regulations > Indirect food additives: Polymers > 177.1050 Acrylonitrile/styrene copoly-mer modified with butadiene/styrene elastomer.



[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR177.1050]

[Page 244-246]
 
                        TITLE 21--FOOD AND DRUGS
 
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN 
                          SERVICES (CONTINUED)
 
PART 177_INDIRECT FOOD ADDITIVES: POLYMERS--Table of Contents
 
Subpart B_Substances for Use as Basic Components of Single and Repeated 
                        Use Food Contact Surfaces
 
Sec.  177.1050  Acrylonitrile/styrene copoly-mer modified with 
butadiene/styrene elastomer.

    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:

[[Page 245]]



------------------------------------------------------------------------
                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.
    (2) Intrinsic viscosity of the matrix copolymer in butyrolactone is 
not less than 0.5 deciliter/gram at 35 [deg]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 [reg] 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 
[deg]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

[[Page 246]]

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]





Additives that reference this regulation:


Source: U.S. Code of Federal Regulations - CFR Title 21, Part 177, Section 1050


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