Invention Grant
- Patent Title: Utilization of kraft lignin in phenol/formaldehyde bonding resins for OSB
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Application No.: US12947703Application Date: 2010-11-16
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Publication No.: US08445563B2Publication Date: 2013-05-21
- Inventor: Jack G. Winterowd , Cheng Zhang , Amar N. Neogi
- Applicant: Jack G. Winterowd , Cheng Zhang , Amar N. Neogi
- Applicant Address: US WA Federal Way
- Assignee: Weyerhaeuser NR Company
- Current Assignee: Weyerhaeuser NR Company
- Current Assignee Address: US WA Federal Way
- Agency: Weyerhaeuser Law Dept
- Main IPC: C08L97/02
- IPC: C08L97/02 ; C08K5/13

Abstract:
A resin for OSB comprising an aqueous resole reaction product of phenol, formaldehyde, alkaline metal hydroxide or carbonate, urea and a degraded lignin polymer having 35-65% solids, a pH of 8-13 and a viscosity 50-1000 centipoises. The phenol and formaldehyde are present in a molar ratio of 1.5 to 3.4 moles formaldehyde to 1 mole phenol and are 40 to 85% of the total solids added to the mixture. In one embodiment they are 50 to 75% of the total solids added to the mixture. The alkaline metal hydroxide or carbonate are 5 to 20% of the total solids added to the mixture. Urea is 5 to 35% of the total solids added to the mixture. The degraded lignin is 5 to 20% of the total solids added to the mixture.A method for making the resin and a product using the resin.
Public/Granted literature
- US20110245381A1 UTILIZATION OF KRAFT LIGNIN IN PHENOL/FORMALDEHYDE BONDING RESINS FOR OSB Public/Granted day:2011-10-06
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