Lignin-based composition board binder comprising a copolymer of a lignosulfonate, melamine and an aldehyde
Patent 4130515 Issued on December 19, 1978. Estimated Expiration Date: 
June 30, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 30, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorAssigneeApplicationNo. 05/811596 filed on 06/30/1977US Classes:527/400, FROM LIGNIN, TANNIN, OR DERIVATIVE REACTANT156/307.3, With coating or impregnating a face to be adhered428/526Next to cellulosicExaminersPrimary: Welsh, M. J.Attorney, Agent or FirmInternational ClassesC08H 5/02 (20060101)C09J 161/00 (20060101) C08G 16/02 (20060101) C09J 161/34 (20060101) C08H 5/00 (20060101) C08L 97/00 (20060101) C08L 97/02 (20060101) C08G 16/00 (20060101) AbstractA lignin-based resin binder for use in the manufacture of composition board is produced by the in situ copolymerization of a major portion of a lignosulfonate salt with melamine and formaldehyde. This resin binder employs lignosulfonate levels up to about 70 percent without any of the deleterious effects normally associated with lignin-based resin systems. The resulting binder is completely compatible with conventional composition board processes and produces a board with superior stability under adverse conditions involving high humidity and temperature over a board produced with a standard typical urea-formaldehyde resin as presently in use.Other References
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