§ 173.70 Chloromethylated aminated styrene-pinylbenzene resin.
Chloromethylated aminated styrene-pinylbenzene copolymer (CAS Reg. No. 60177–39–1) may be safely used in food in accordance with the following prescribed conditions:
(a) The additive is an aqueous dispersion of styrene-pinylbenzene copolymers, first chloromethylated then aminated with trimethylamine, having an average particle size of not more than 2.0 microns.
?。╞) The additive shall contain no more than 3.0 percent nonvolatile, soluble extractives when tested as follows: One hundred grams of the additive is centrifuged at 17,000 r/min for 2 hours. The resulting clear supernatant is removed from the compacted solids and concentrated to approximately 10 grams on a steam bath. The 10-gram sample is again centrifuged at 17,000 r/min for 2 hours to remove any residual insoluble material. The supernatant from the second centrifugation is then removed from any compacted solids and dried to constant residual weight using a steam bath. The percent nonvolatile solubles is obtained by piding the weight of the dried residue by the weight of the solids in the original resin dispersion.
?。╟) The additive is used as a decolorizing and clarification agent for treatment of refinery sugar liquors and juices at levels not to exceed 500 parts of additive solids per million parts of sugar solids.
[50 FR 29209, July 18, 1985]
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