§177.2420 Polyester resins, cross-
Cross-
（a） The cross-
（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-
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 resins or added thereto to impart desired technical or physical properties include the following, provided that the quantity used does not exceed that reasonably required to accomplish the intended physical or technical effect and does not exceed any limitations prescribed in this section:
| List of substances | Limitations (limits of addition expressed as percent by weight of finished resin) |
| 1. Inhibitors: | Total not to exceed 0.08 percent. |
| Benzoquinone | 0.01 percent. |
| tert-Butyl catechol | |
| TBHQ | |
| Di-tert-butyl hydroquinone | |
| Hydroquinone | |
| 2. Accelerators: | Total not to exceed 1.5 percent. |
| Benzyl trimethyl ammonium chloride | 0.05 percent. |
| Calcium naphthenate | |
| Cobalt naphthenate | |
| Copper naphthenate | |
| N, N-Diethylaniline | 0.4 percent. |
| N, N-Dimethylaniline | Do. |
| Ethylene guanidine hydrochloride | 0.05 percent. |
| 3. Catalysts: | Total not to exceed 1.5 percent, except that methyl ethyl ketone peroxide may be used as the sole catalyst at levels not to exceed 2 percent. |
| Azo-bis-isobutyronitrile | |
| Benzoyl peroxide | |
| tert-Butyl perbenzoate | |
| Chlorbenzoyl peroxide | |
| Cumene hydroperoxide | |
| Dibutyltin oxide (CAS Reg. No. 818-08-6) | For use in the polycondensation reaction at levels not to exceed 0.2 percent of the polyester resin. |
| Dicumyl peroxide | |
| Hydroxybutyltin oxide (CAS Reg. No. 2273-43-0) | For use in the polycondensation reaction at levels not to exceed 0.2 percent of the polyester resin. |
| Lauroyl peroxide | |
| p-Menthane hydroperoxide | |
| Methyl ethyl ketone peroxide | |
| Monobutyltin tris(2-ethylhexoate) (CAS Reg. No. 23850-94-4) | For use in the polycondensation reaction at levels not to exceed 0.2 percent of the polyester resin. |
| 4. Solvents for inhibitors, accelerators, and catalysts: | |
| Butyl benzyl phthalate (containing not more than 1.0 percent by weight of dibenzyl phthalate) | |
| Dibutyl phthalate | |
| Diethylene glycol | As a solvent for benzyl trimethyl ammonium chloride or ethylene guanidine hydrochloride only. |
| Dimethyl phthalate | |
| Methyl alcohol | |
| Styrene | |
| Triphenyl phosphate | |
| 5. Reinforcements: | |
| Asbestos | |
| Glass fiber | |
| Polyester fiber produced by the condensation of one or more of the acids listed in paragraph (a)(1) of this section with one or more of the alcohols listed in paragraph (a)(2) of this section | |
| 6. Miscellaneous materials: | |
| Castor oil, hydrogenated | |
| α-Methylstyrene | |
| Polyethylene glycol 6000 | |
| Code of Federal Regulations 343 | |
| Silicon dioxide | |
| Wax, petroleum | Complying with § 178.3710 of this chapter. |
（c） The cross-
（1） Net chloroform-soluble extractives not to exceed 0.1 milligram per square inch of food-contact surface tested when the prescribed food-simulating solvent is water or 8 or 50 percent alcohol.
（2） Total nonvolatile extractives not to exceed 0.1 milligram per square inch of food-contact surface tested when the prescribed food-simulating solvent is heptane.
（d） In accordance with good manufacturing practice, finished articles containing the cross-
[42 FR 14572, Mar. 15, 1977, as amended at 48 FR 37618, Aug. 19, 1983; 54 FR 48858, Nov. 28, 1989]
