Epoxy-based stoving enamels comprising carboxyl-functional alkylidenepolyphenols
AssigneeVianova Resins GmbH
InventorsThomas Burkhart, Wolfgang Hesse, Paul Oberressl
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Abstract
Stoving enamels comprising epoxy resins and carboxyl-functional alkylidenepolyphenols in a quantity such that the carboxyl groups are present at least in equimolar quantities relative to the epoxide groups of the epoxy resins are suitable for coating the inside of metallic food containers and give, on the packaging, baked coating films which are essentially free from migratable constituents carrying epoxide groups.
Claims20
A stoving enamel consisting essentially of one or more epoxy resins containing more than one epoxide group per molecule and one or more carboxyl-functional novolaks which are reaction products of a novolak and one or more acids selected from the group consisting of olefinically unsaturated mono- and dicarboxylic acids, anhydrides of the mono- and dicarboxyclic acids, and haloalkanoic acids,
- in a quantity such that the carboxyl groups are present in at least an equimolar quantity relative to the epoxide groups of the epoxy resins, and the enamel optionally comprising a natural-resin acid.
Dependencies are inferred from the claim text.