Lignin modified binding agents
AssigneeRutgerswerke Aktiengesellschaft
InventorsArno Gardziella, Achim Hansen, Stephan Schroter, Josef Suren
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Abstract
A binding agent for molding compositions and molded bodies produced by reacting a low molecular weight lignin from the Organosolv process with phenol in a weight ratio of 1:20 to 3:1 at 100.degree. to 180.degree. C., adjusting the pH to an acidic value and condensing the mixture with 0.2 to 0.9 moles of formaldehyde per mole of phenol at 60.degree. to 120.degree. C. to form the binding agent useful for producing curable molding compositions, high-temperature molding compositions, refractory products, textile fleeces and friction coatings as well as carbon materials.
Claims3
A process for the preparation of a binding agent for molding compositions and molded bodies comprising reacting a low molecular weight lignin from the Organosolv process having a mean molecular weight of 500 to 3,000 with phenol in a weight ratio of 1:20 to 3:1 at 100.degree. to 180.degree. C., adjusting the pH to an acidic value and condensing the mixture with 0.2 to 0.9 moles of formaldehyde per mole of phenol at 60.degree. to 120.degree. C. to form the binding agent.
Dependencies are inferred from the claim text.