Interaction of a Vinylic Organosol Used as Can Coating with Solvents and Food Simulants

Abstract

Metal cans are often protected from corrosion by vinylic organosol coatings, made from PVC and epoxyphenolic (EP) resins. Using electron spin resonance, BADGE, a monomer of EP, was shown to plasticize PVC. Optimization of extraction allowed extraction of 4 mg of BADGE/dm2, so vinylic organosols appear to be worst-case coatings. Comparison of behavior between BADGE and a paramagnetic probe revealed that these compounds were trapped to a large extent in the cross-linked EP network and could not migrate at 40 °C. Contact with triglycerides, which plasticize the coating, induced high migration of BADGE. Neither isooctane nor ethanol could mimic fats, in contrast to isooctane/tert-butyl acetate mixtures. In aqueous foodstuffs, BADGE hydrolyzed into a monoepoxide and then into a bisdiol. The total amount of toxicologically relevant epoxides over shelf life was shown to reach a maximum value within 3 weeks at 40 °C, at very low levels, whatever the aqueous food simulant. After sterilization at 120 °C (20 min), the level of BADGE in the migrate is very low, whereas up to 2 mg of hydrolysis products is found in the liquid/dm2. During further storage at 40 °C, the amount of epoxides rapidly decreases.

Intake of bisphenol A from canned beverages and foods on the Belgian market

“…As a consequence, BPA can migrate from the coating layer into the contents of the can (Paseiro Losada et al 1997;Munguı´a-Lo´pez et al 2005;Cao et al 2008). Metal cans can also be coated with organosol resins, which are manufactured by mixing several types of resins, such as polyvinylchloride (PVC), epoxy, phenolic, epoxyphenolic resins and, sometimes, BADGE (Cottier et al 1998).…”

Interfacial mass transport properties which control the migration of packaging constituents into foodstuffs

“…can diffuse into food products. Significant concentrations of packaging substances with potential health concern were mainly identified in foods packed in plasticized PVC cling-films (Harison, 1988;Petersen & Breindahl, 2000;Sharman, Readn, Castle, & Gilbert, 1994) and in canned foods (Biedermann et al, 1996;Cottier et al, 1998;EC-DG SANCO-D3, 2002a;Simoneau, Theobald, Wiltschko, & Anklam, 2001;Simoneau et al, 1999). The European regulation defined positive lists of substances authorized for the formulation of materials intended to be put in contact with food, and specific migration limits (SML) for the substances.…”

Food and beverage can coatings: A review on chemical analysis, migration, and risk assessment

“…With the exception of vinyl organosol coatings, generally, they are not applied directly on the metal surface because of their limited adhesion to metal substrates (LaKind, 2013). Vinylic organosols are manufactured by mixing several types of resins including poly(vinyl chloride) (PVC), epoxy, and phenolic and epoxy-phenolic resins (Cottier et al, 1998). PVC is produced by polymerization of vinyl chloride monomer (PVM).…”