[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR176.120]

[Page 194-195]
 
                        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 of Contents
 
 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,

[[Page 195]]

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.