[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: 21CFR175.260]
[Page 171-172]
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
SERVICES (CONTINUED)
PART 175 INDIRECT FOOD ADDITIVES: ADHESIVES AND COMPONENTS OF
Subpart C Substances for Use as Components of Coatings
Sec. 175.260 Partial phosphoric acid esters of polyester resins.
Partial phosphoric acid esters of polyester resins identified in
this section and applied on aluminum may be safely used as food-contact
coatings, in accordance with the following prescribed conditions:
(a) For the purpose of this section, partial phosphoric acid esters
of polyester resins are prepared by the reaction of trimellitic
anhydride with 2,2-dimethyl-1,3-propanediol followed by reaction of the
resin thus produced with phosphoric acid anhydride to produce a resin
having an acid number of 81 to 98 and a phosphorus content of 4.05 to
4.65 percent by weight.
(b) The coating is chemically bonded to the metal and cured at
temperatures exceeding 450 [deg]F.
(c) The finished food-contact coating, when extracted with the
solvent or solvents characterizing the type of food and under the
conditions of time and temperature characterizing the conditions of its
intended use, as determined from tables 1 and 2 of Sec. 175.300(d),
yields total extractives in each extracting solvent not to exceed 0.3
milligrams per square inch of food-contact surface, as determined by the
methods described in Sec. 175.300(e), and the coating
[[Page 172]]
yields 2,2-dimethyl-1,3-propanediol in each extracting solvent not to
exceed 0.3 micrograms per square inch of food-contact surface. In
testing the finished food-contact articles, a separate test sample is to
be used for each required extracting solvent.
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