Resorcinol-glutaraldehyde resin as an accelerator for curing phenol-formaldehyde resins

A process for the production of plywood by bonding together with an adhesive resin binder that is curable under heat and pressure, at least two plies having a layer of the adhesive resin binder between them, comprising

• (a) spraying at least one surface of at least one ply with an adhesive resin binder therefor that is curable upon the application of heat, which binder comprises an alkaline phenolic resole resin solution and resorcinol-glutaraldehyde resin;
• (b) juxtaposing the ply to which said adhesive binder has been applied with another ply, with said adhesive binder therebetween, and then
• (c) subjecting said juxtaposed plies to heat and pressure to cure said binder and unite said plies to form plywood.

A cellulosic board formed under heat and pressure from separate cellulosic components bound together by an adhesive binder cured under applied heat and pressure, wherein said binder in its uncured form comprises an aqueous resin blend comprising an alkaline phenol-formaldehyde resole and an accelerator wherein said accelerator comprises a resorcinol-glutaraldehyde reaction product.

A process for making a product by bonding cellulosic components under heat and pressure comprising

• (a) applying to separate cellulosic components an effective amount of a binder wherein said binder comprises (1) an alkaline phenolic resin solution having a resin solids content of at least 40% by weight and (2) an amount of resorcinol glutaraldehyde resin;
• and
• (b) subjecting said cellulosic components to heat and pressure to cure said binder and to unite said components.