Fire retardant treatment

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 23/76 (2006.01) C09K 21/02 (2006.01) D06M 11/46 (2006.01) D06M 11/82 (2006.01) D21H 21/34 (2006.01)

Patent

CA 2253302

Fire retardant cellulosic material comprises from 0.4 to 2.0 % by weight of tin and from 0.4 to 8.0 % by weight of boron based on the weight of the cellulosic material. The fire retardant material is prepared in a two-stage or a one-stage process. The two-stage process comprises impregnation of the material with an alkaline solution of an alkali metal stannate or stannite, followed by impregnation with an aqueous solution of boric acid and drying. The one-stage process comprises impregnation of the material with a stable aqueous colloidal suspension of hydrous tin oxide stabilised with an alkali metal salt of boric acid having a pH in the range of from 4 to 8, followed by drying.

Un matériau cellulosique ignifuge contient entre 0,4 et 2,0 % en poids d'étain et entre 0,4 et 8,0 % en poids de bore sur la base du poids du matériau cellulosique. On prépare le matériau ignifuge par un processus à une ou deux étapes. Le processus à deux étapes comprend l'imprégnation du matériau par une solution alcaline d'un stannate ou d'un stannite de métal alcalin, suivie de l'imprégnation par une solution aqueuse d'acide borique, puis du séchage. Le processus à une seule étape comprend l'imprégnation du matériau par une suspension colloïdale aqueuse stable d'un oxyde hydrique d'étain stabilisé par un sel de métal alcalin d'acide borique ayant un pH compris entre 4 et 8, suivie de séchage.

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