Flame retarding cellulosic materials with sodium or potassium thiocyanate
AssigneeThe United States of America as represented by the Secretary of Commerce
InventorRobert J. McCarter
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Abstract
A flame resistant cellulosic insulation material, method of treating loosll cellulosic material and compositions for imparting flame resistance and flame and smolder resistance to such materials are disclosed utilizing thiocyanate compounds interstitially distributed throughout the cellulosic insulation material as a flame retardant. Sodium and potassium thiocyanate are used in extremely small quantities in insulation materials and impart flame resistance due to the hygroscopic migration of the compounds into the insulation material. The effectiveness of such small quantities of thiocyanate make possible the addition and retention of effective amounts of powdered smolder inhibitors such as boric acid, and sulfur.
Claims39
A flame resistant cellulosic insulation material comprising:
- a cellulosic fibrous mass of sufficiently low density to provide insulating effects;
- a compound selected from the group consisting of sodium thiocyanate, potassium thiocyanate and mixtures thereof.
A method of flame proofing cellulosic insulating materials comprising:
- treating the insulation material with a compound selected from the group consisting of sodium thiocyanate, potassium thiocyanate and mixtures thereof in an amount of at least about 1% by weight based on the weight of the cellulosic insulation material.
A composition for the flame retarding and smolder inhibiting treatment of cellulosic insulation materials comprising:
- a flame retardant compound selected from the group consisting of sodium thiocyanate, potassium thiocyanate and mixtures thereof, and a smolder inhibitor compound selected from the group consisting of sulfur, boric acid, and mixtures thereof.
A method for treating cellulosic insulation material comprising:
- applying a flame retardant compound selected from the group consisting of sodium thiocyanate, potassium thiocyanate and mixtures thereof to cellulosic insulation material, and
- interstitially dispersing said flame retardant compound into said insulation material.
Dependencies are inferred from the claim text.