[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: 21CFR176.120]
[Page 197]
TITLE 21--FOOD AND DRUGS
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN
SERVICES (CONTINUED)
PART 176 INDIRECT FOOD ADDITIVES: PAPER AND PAPERBOARD COMPONENTS--Table
Subpart B Substances for Use Only as Components of Paper and Paperboard
Sec. 176.120 Alkyl ketene dimers.
Alkyl ketene dimers may be safely used as a component of articles
intended for use in producing, manufacturing, packing, processing,
preparing, treating, packaging, transporting, or holding food, subject
to the provisions of this section.
(a) The alkyl ketene dimers are manufactured by the
dehydrohalogenation of the acyl halides derived from the fatty acids of
animal or vegetable fats and oils.
(b) The alkyl ketene dimers are used as an adjuvant in the
manufacture of paper and paperboard under such conditions that the alkyl
ketene dimers and their hydrolysis products dialkyl ketones do not
exceed 0.4 percent by weight of the paper or paperboard.
(c) The alkyl ketene dimers may be used in the form of an aqueous
emulsion which may contain sodium lignosulfonate as a dispersant.
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