Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From lignin – tannin – or derivative reactant
Patent
1990-03-12
1991-04-23
Nielsen, Earl
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From lignin, tannin, or derivative reactant
530501, 530507, C08H 502
Patent
active
050101560
ABSTRACT:
A lignin-modified phenol-formaldehyde resin for use as an adhesive for particulate wood products is disclosed which is prepared by reacting phenol and formaldehyde with an aqueous alkaline solution of an organosolv lignin. The organosolv lignin used in the formation of the resin is obtained from a pulping liquor prepared from particulate wood material from hardwood trees, aqueous polar organic solvent, and an acid catalyst. The resin allows for replacement of phenol or organosolv lignin at a level of up to 40% without detrimentally affecting its performance in terms of bonding strength or durability. The resin of the present invention is also superior to prior art lignin-modified resins in that it is low in sulfate, ash and sulfur residues, and thus will not give off distracting or harmful sulfur odors during resin preparation or hot-pressing of the adhesive and is unaffected and not solubilized by water.
REFERENCES:
patent: 3227667 (1966-01-01), Moffitt et al.
patent: 4587285 (1986-05-01), Ayla et al.
patent: 4594130 (1986-01-01), Chang et al.
patent: 4746401 (1988-05-01), Roberts et al.
Cook Phillip M.
Hess Steven L.
Eastman Kodak Company
Heath, Jr. William P.
Krass Frederick
Montgomery Mark A.
Nielsen Earl
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