- Process for manufacturing an alpha-dihydroxy derivative and epoxy resins prepared therefrom
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A process for manufacturing an α-dihydroxy derivative from an aryl allyl ether wherein such α-dihydroxy derivative can be used to prepare an α-halohydrin intermediate and an epoxy resin prepared therefrom including epoxidizing an α-halohydrin intermediate produced from a halide substitution of an α-dihydroxy derivative which has been obtained by a dihydroxylation reaction of an aryl allyl ether in the presence of an oxidant or in the presence of an oxidant and a catalyst.
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Page/Page column 41-42
(2008/06/13)
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- Interaction of a Vinylic Organosol Used as Can Coating with Solvents and Food Simulants
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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.
- Cottier,Feigenbaum,Mortreuil,Reynier,Dole,Riquet
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p. 5254 - 5261
(2007/10/03)
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