[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: 21CFR177.1555]
[Page 301]
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. 177.1555 Polyarylate resins.
Polyarylate resins (CAS Reg. No. 51706.10-6) may be safely used as
articles or components of articles intended for use in contact with food
in accordance with the following prescribed conditions:
(a) Identity. Polyarylate resins (1, 3-benzenedicarboxylic acid,
diphenyl ester, polymer with diphenyl 1,4-benzenedicarboxylate and 4-4'-
(1-methylethylidine) bis(phenol)) are formed by melt polycondensation of
bisphenol-A with diphenylisophthalate and diphenylterephthalate.
(b) Specifications. (1) The finished copolymers shall contain from
70 to 80 weight percent of polymer units derived from
diphenylisophthalate and 20 to 30 weight percent of polymer units
derived from diphenylterephthalate.
(2) Polyarylate resins shall have a minimum weight average molecular
weight of 20,000.
(3) Polyarylate resins may be identified by their characteristic
infrared spectra.
(c) Extractive limitations. The finished polyarylate resins in sheet
form at least 0.5 millimeter (0.020 inch) thick, when extracted with
water at 121 [deg]C (250 [deg]F) for 2 hours, shall yield total
nonvolatile extractives not to exceed 2.33 micrograms per square
centimeter (15 micrograms per square inch) of the exposed resin surface.
(d) Limitations. Polyarylate resin articles may be used in contact
with all foods except beverages containing more than 8 volume percent
ethanol under conditions of use A through H, described in table 2 of
Sec. 176.170(c) of this chapter.
[52 FR 35540, Sept. 22, 1987]
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