Thermosetting adhesive resins
AssigneeChemical Process Corporation
InventorsTito Viswanathan, Thomas Richardson
Life of this patent
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Abstract
A thermosetting adhesive resin suitable for binding lignocellulosic materials to form products, such as plywood or particle board, is prepared by heating an aqueous sugar or starch solution in the presence of an inorganic acid or its ammonium salt and a metal ion catalyst to obtain a partially polymerized resin which is reacted with an organic acid anhydride just prior to application to the lignocellulosis materials. The adhesive formula contains no formaldehyde and the preferred aqueous solutions are whey or whey byproduct concentrates.
Claims17
A method of preparing a thermosetting resin for binding lignocellulosic materials together to form useful products which consisting essentially of heating an aqueous sugar or starch solution and a crosslinking agent selected from urea, phenol and mixtures of urea and phenol in the presence of an inorganic acid or its ammonium salt and a metal ion catalyst at a temperature between about 50.degree. to about 200.degree. C. for about 30 minutes to about 18 hours to obtain a partially polymerized fusible resin and then adding an organic acid anhydride to the fusible resin prior to application to the lignocellulosic materials.
A method of preparing a fusible resin which upon addition of an organic acid anhydride results in thermosetting adhesive useful in binding lignocellulosic materials, said method consisting essentially of heating an acqueous sugar or starch solution and a crosslinking agent selected from urea, phenol and mixtures of urea and phenol in the presence of an inorganic acid or its ammonium salt and a metal ion catalyst at about 50.degree. C. to about 200.degree. C. for about 30 minutes to about 18 hours to obtain an aqueous solution of a partially polymerized fusible resin.
A thermosetting adhesive resin prepared by reacting an aqueous sugar or starch solution with an inorganic acid or its ammonium salt in the presence of a metal ion catalyst at a temperature of about 50.degree. to about 200.degree. C. for about 30 minutes to about 18 hours to obtain a partially polymerized fusible resin which is then reacted with an organic acid anhydride.
Dependencies are inferred from the claim text.