Rubber compositions containing high purity lignin derivatives
AssigneeRepap Technologies Inc.
InventorsJairo H. Lora, Michael J. Trojan, William H. Klingensmith
Life of this patent
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Abstract
A tackifier composition for use in rubber compounds is disclosed. The tackifier comprises a pure lignin with a water solubility of up to 1% by weight and a carbohydrate level of less than 50% by weight. In another embodiment of the invention, the pure lignin functions as both a tackifier and an antioxidant. In yet another preferred embodiment of the invention, the improved tackifier produces synergistic results when blended with a commercial tackifier, and the antioxidant likewise yields synergistic results when mixed with a commercial antioxidant.
Claims41
A tackifier composition for rubber comprising a lignin recovered from biomass wherein said lignin has a water solubility of up to 1% by weight at a pH of 7 or less and a carbohydrate level of less than 50% by weight.
A process for producing a rubber composition comprising mixing raw rubber stock and a lignin wherein said lignin has a water solubility of up to 1% by weight at a pH of 7 or less and a carbohydrate content of less than 50% by weight and wherein said lignin is sufficiently soluble in said rubber composition such that said lignin imparts tackifying properties to said rubber composition.
Dependencies are inferred from the claim text.