Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1979-11-23
1981-12-22
Nielsen, Earl A.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
252182, C08G 828, C08H 502
Patent
active
043069991
ABSTRACT:
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.
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patent: 3223647 (1965-12-01), Ball et al.
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patent: 3864291 (1975-02-01), Enkvist
Adams James W.
Schoenherr Michael W.
American Can Company
Auber Robert P.
Bartlett Ernestine C.
Dorman Ira S.
Nielsen Earl A.
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