（a） The cross-linked polyester resins are produced by the condensation of oneormore of the acids listed in paragraph （a）（1） of this section with oneormore of the alcoholsorepoxides listed in paragraph （a）（2） of this section, followed by copolymerization with oneormore of the cross-linking agents listed in paragraph （a）（3） of this section:
（1） Acids:
Adipic.
Fatty acids, and dimers thereof, from natural sources.
Fumaric.
Isophthalic.
Maleic.
Methacrylic.
Orthophthalic.
Sebacic.
Terephthalic.
Trimellitic.
（2） Polyols and polyepoxides:
Butylene glycol.
Diethylene glycol.
2,2-Dimethyl-1,3-propanediol.
Dipropylene glycol.
Ethylene glycol.
Glycerol.
4,4 -Isopropylidenediphenol-epi-chloro-hydrin.
Mannitol.
a-Methyl glucoside.
Pentaerythritol.
Polyoxypropylene ethers of 4,4 -isopropylide-nediphenol （containing an average of 2-7.5 moles of propylene oxide）.
Propylene glycol.
Sorbitol.
Trimethylol ethane.
Trimethylol propane.
2,2,4-Trimethyl-1,3-pentanediol.
（3） Cross-linking agents:
Butyl acrylate.
Butyl methacrylate.
Ethyl acrylate.
Ethylhexyl acrylate.
Methyl acrylate.
Methyl methacrylate.
Styrene.
Triglycidyl isocyanurate （CAS Reg. No. 2451-62-9）, for use only in coatings contacting bulk quantities of dry food of the type identified in 176.170（c） of this chapter, table 1, under type VIII.
Vinyl toluene.
（b） Optional adjuvant substances employed to facilitate the production of the resinsoradded thereto to impart desired technicalorphysical properties include the following, provided that the quantity used does not exceed that reasonably required to accomplish the intended physicalortechnical effect and does not exceed any limitations prescribed in this section:
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