Urea–resorcinol–formaldehyde adhesives of low resorcinol content

摘要

AbstractLow resorcinol content cold‐setting urea–resorcinol–formaldehyde (URF) resins were prepared. Most of these adhesives had water‐resistant properties, whereas some also presented weather‐ and boil‐proof adhesive characteristics and performance. URF resins of acceptable adhesive performance were also prepared by inducing branching by introducing a certain amount of resorcinol or of polyflavonoid mimosa tannin extract as a branching unit. Resorcinol content as low as 12.7 and 12.15 on total liquid resin were obtained by this method while still maintaining adhesive performance and water‐resistant properties. © 1993 John W