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US 11,213,881 B2Granted
Component system for producing cores and molds
AssigneeASK Chemicals GmbH
InventorsChristian Priebe, Jens Müller, Heinz Deters, Philip Schneider, Frank Lenzen, Markus Dörschel
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Abstract
The object of the invention is a component system for producing a binder for metal casting on the basis of phenolic resins of the benzyl ether type and isocyanates containing non-polar solvents.
Claims27
A component system for hardening mold material mixtures, the system comprising the following components, which are spatially separate from each other:
- a polyol component, comprising a phenolic resin having benzylic ether linkages and a solvent, wherein the phenolic resin having benzylic ether linkages is dissolved in the solvent, with at least 95% by weight of the solvent being a non-polar solvent selected from the group consisting of:
- hydrocarbons, alkyl/alkoxy silanes, alkyl/alkoxy siloxanes and mixtures thereof;
- and
- an isocyanate component comprising one or more isocyanate compounds having at least 2 isocyanate groups per molecule;
- wherein the phenolic resin having benzylic ether linkages has at least one phenol as a monomer component that is substituted with an aliphatic hydrocarbon group and is substituted on the aromatic ring thereof with an aliphatic hydrocarbon group having 11 to 26 hydrocarbon atoms and 0 to 4 double bonds, and the portion of the hydrocarbon group-substituted phenol in the phenolic resin is 0.5 to 20% by weight;
- and
- wherein the phenolic resin having benzylic ether linkages contains less than 2.5% by weight free phenol.
4 more elements
Dependencies are inferred from the claim text.