Stock material or miscellaneous articles – Composite – Of aldehyde or ketone condensation product
Patent
1989-07-11
1991-04-23
Lusignan, Michael
Stock material or miscellaneous articles
Composite
Of aldehyde or ketone condensation product
106 1814, 106 1821, 252607, 427439, 427440, 428528, 428530, 428921, B32B 2742
Patent
active
050099647
ABSTRACT:
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.degree. C. to about 90.degree. 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.degree. C. to about 90.degree. 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.
REFERENCES:
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patent: 2488034 (1949-11-01), Pingree et al.
patent: 3939107 (1976-02-01), Brown
patent: 4301217 (1981-11-01), Rohringer et al.
patent: 4373010 (1983-02-01), Oberley
patent: 4806620 (1989-02-01), Klett et al.
patent: 4839099 (1989-06-01), Umehara et al.
Leach Robert M.
Richards Michael J.
Bean Jr. Edwin T.
Korman Alan S.
Linihan Martin G.
Lusignan Michael
Osmose Wood Preserving, Inc.
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