Resin-containing cellulosic overlays
AssigneePacific Resins & Chemicals, Inc.
InventorsJohn F. Miller, Rodney R. Conner
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Abstract
Disclosed are improved resin-containing cellulosic overlays for overlaying woody substrates and processes for preparing same. The overlays are produced by admixing an aqueous slurry of cellulosic fibers and a resole resin produced by reacting bisphenol A, a para-substituted phenol selected from p-tertiarybutylphenol, p-tertiaryamylphenol and p-phenylphenol and formaldehyde, precipitating the resin by acidifying the resulting slurry, forming a sheet from the resin-containing slurry and drying the sheet. The overlays produced are white in color and are highly resistant to discoloration due to exposure to sunlight, heat and caustic.
Claims19
In a process for producing a resin-containing cellulosic overlay useful for overlaying woody substrates comprising admixing an aqueous slurry of cellulosic fibers and an alkaline, water-solubilized resin, precipitating the resin onto said fibers by acidification of said slurry and forming a dry sheet from the acidified slurry, the improvement wherein said resin is a resole resin produced by reacting bisphenol A, from 0.35 to 1.35 moles per mole of bisphenol A of a para-substituted phenol selected from p-tertiarybutylphenol, p-tertiaryamylphenol and p-phenylphenol and an amount of formaldehyde satisfying the equations F .gtoreq. 0.3(4X + 2Y) and F .ltoreq. 4X + 2Y wherein F is the number of moles of formaldehyde, X is the number of moles of bisphenol A and Y is the number of moles of para-substituted phenol.
Dependencies are inferred from the claim text.