[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR177.2500]
[Page 348]
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 C Substances for Use Only as Components of Articles Intended for
Repeated Use
Sec. 177.2500 Polyphenylene sulfone resins.
The polyphenylene sulfone resins (CAS Reg. No. 31833-61-1)
identified in paragraph (a) of this section may be safely used as
articles or components of articles intended for repeated use in contact
with food, subject to the provisions of this section.
(a) Identity. For the purpose of this section, polyphenylene sulfone
resins consist of basic resin produced by reacting polyphenylene sulfide
with peracetic acid such that the finished resins meet the
specifications set forth in paragraph (c) of this section. The
polyphenylene sulfide used to manufacture polyphenylene sulfone is
prepared by the reaction of sodium sulfide and p-dichlorobenzene, and
has a minimum weight average molecular weight of 5,000 Daltons.
(b) Optional adjuvant substances. The basic polyphenylene sulfone
resins identified in paragraph (a) of this section may contain optional
adjuvant substances required in the production of such basic resins.
These optional adjuvant substances may include substances permitted for
such use by regulations in parts 170 through 189 of this chapter,
substances generally recognized as safe in food, or substances used in
accordance with a prior sanction or approval.
(c) Specifications. The glass transition temperature of the polymer
is 3605 [deg]C as determined by the use of
differential scanning calorimetry.
[65 FR 15058, Mar. 21, 2000]
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