초록 ▼

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

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 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.

대표청구항 ▼

A process 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 which comprises: (a) reacting a solution of water, an oxy acid of phosphorus and a nitrog

A process 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 which comprises: (a) reacting a solution of water, an oxy acid of phosphorus and a nitrogen containing compound selected from the group consisting of urea, melamine, mono, di and trimethylamine, mono, di, and triethylamine, dicyandiamide, hexamethylenetetramine and other equivalent nitrogen containing compounds in a weight ratio of about 0.1 to about 15 oxy acid per part nitrogen compound for a time of about 15 minutes to about 3 hours at a temperature from about 25°C. to about 90°C.; (b) adjusting the pH of said solution from about 6.0 to about 9.0 with a water soluble alkaline compound selected from the group consisting of ammonia, ammonium hydroxide, mono, di and trimethylamine, mono, di and triethylamine and ethanolamine or other equivalent nitrogen containing alkaline compounds; (c) reacting said solution with an aldehyde compound selected from the group consisting of formaldehyde, acetaldehyde, and glyoxal in a weight ratio of about 1.0 to about 56 total initial oxy acid per part aldehyde compound for a time of about 5 minutes to about 1.5 hours at a temperature from about 25°C. to about 90°C.; and (d) adjusting the final pH of said solution from about 7.0 to about 8.5 with a water soluble alkaline compound selected from the group consisting of ammonia, ammonium hydroxide, mono, di and trimethylamine, mono, di and triethylamine and ethanolamine or other equivalent nitrogen containing alkaline compounds. A cellulosic material impregnated with a fire retardant amount of the fire retardant composition made in accordance with the process of claim 1.