Flame resistant paperboard

Details Flame resistant paperboard Flame resistant paperboard

D - Textiles, Paper

21

H

117/34, 8/93.39

D21H 17/14 (2006.01) D21H 17/17 (2006.01) D21H 17/66 (2006.01)

Patent

CA 1059269

ABSTRACT An aqueous solution of flame retardant and size material that can be used to treat a web of unsized cellulosic material such as paperboard or the like to impart fire resistant and water repellent properties thereto without markedly decreasing the strength of the treated material is described. The preferred composition comprises water, ammonium sulfate, ammonium phosphate and an alkyl- ketene dimer. Other combinations are described. The pH of the solution should be between 3 and 8. The amount of the composition incorporated into the treated paper is described as are test results showing strength, water resistance and flame resistant characteristics of the resulting product. The manner of impregnation the cellu- losic material with the treating composition is also described.

215830

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