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US 4,306,999 AGranted
High solids, low viscosity lignin solutions
AssigneeAmerican Can Company
InventorsJames W. Adams, Michael W. Schoenherr
Life of this patent
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AssigneeAmerican Can Company
InventorsJames W. Adams, Michael W. Schoenherr
Estimating the term…
Lignin concentrate solutions with at least about 40% total solids, having viscosities not higher than 10,000 cps. at 25.degree. C. and comprising normally water-insoluble and phenol-insoluble Kraft lignin dissolved in solvents comprising phenol and water or phenol-water-sodium hydroxide or ammonia are provided. The concentrates contain lignin to phenol weight ratios of less than 70:30 and more than 40:60 and preferably 50:50, and optionally, 2 to 20%, based on the weight of lignin, of sodium hydroxide or ammonia. The concentrates are storable and suitable for shipment and may be employed as phenol extenders in applications normally using phenols. They are particularly tailored for use in replacement of 25% to 100% of the phenol component in the production of phenol/formaldehyde resins and, when so employed, provide phenol-lignin-formaldehyde (PLF) resins that are useful in the formulation of plywood adhesives.
A lignin concentrate solution having in excess of about 40% total solids and a viscosity not higher than 10,000 cps. at 25.degree. C. consisting essentially of normally water-insoluble and phenol-insoluble alkali lignin derived from black liquor and dissolved in a solvent selected from the group consisting of (a) phenol and water and (b) phenol, water and sodium hydroxide or ammonia;
A lignin concentrate solution having a total solids content of about 65%, a viscosity not higher than 10,000 cps. at 25.degree. C. and consisting essentially of about 32% to about 36% normally water-insoluble and phenol-insoluble alkali lignin derived from black liquor and dissolved in about 32% to about 36% phenol and about 30% to about 36% water.
A method for dissolving normally water-insoluble and phenol-insoluble alkali lignin derived from black liquor in a solvent to produce a lignin concentrate solution comprising in excess of about 40% total solids and having a viscosity not higher than 10,000 cps. at a temperature of 25.degree. C. consisting of the steps of
Dependencies are inferred from the claim text.