B - Operations – Transporting – 27 – K
Patent
B - Operations, Transporting
27
K
8/93.39, 6/13.5
B27K 3/32 (2006.01) B27K 3/52 (2006.01) C09K 21/04 (2006.01)
Patent
CA 2008928
Abstract of the Disclosure A process is provided for forming a fire retardant composition useful for treating cellulosic materials to impart both fire retardant properties and improved thermal stability under high temperature and humidity conditions. The process comprises reacting a solution of orthophosphoric acid, urea and water having a weight ratio from about 0.1 to about 15 orthophosphoric acid per part urea for a time of about 15 minutes to about 3 hours at a temperature from about 25°C to about 90°C; adding ammonium hydroxide in an amount sufficient to adjust the pH of the solution from about 6.0 to about 9.0; reacting the solution with formaldehyde having a weight ratio from about 1.0 to about 56 total initial orthophosphoric acid per part formaldehyde for a time of about 5 minutes to about 1.5 hours at a temperature from about 25°C to about 90°C, and adjusting the final pH of the solution from about 7.0 to about 8.5 with ammonium hydroxide. In another aspect thereof, the present invention provides a method of treating cellulosic materials comprising impregnating the cellulosic material with a fire retardant amount of the fire retardant composition formed in accordance with the above process.
Leach Robert M.
Richards Michael J.
Leach Robert M.
Macrae & Co.
Osmose Wood Preserving Inc.
Richards Michael J.
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