Addition of endothermic fire retardants to provide near neutral pH pulp fiber webs
AssigneeInternational Paper Company
InventorsJames E. Sealey, Brent A. Fields
Life of this patent
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Abstract
A process in which an at least partially delignified pulp fiber web having a Kappa number of less than about 130 is treated with an aqueous endothermic fire retardant solution having a pH of about 10 or less. The treated pulp fiber web has a near neutral pH of from about 5 to about 9, and is treated with at least about 20 lbs of endothermic fire retardants per ton of the pulp fiber web, with at least about 5% of the total amount of endothermic fire retardants being added at a point prior to when the pulp fiber web is formed. Also a fire resistant pulp fiber web having a near neutral pH.
Claims15
An article comprising a fire resistant pulp fiber web having a pH of from about 5 to about 9, and comprising:
- an at least partially delignified pulp fiber web having a Kappa number of less than about 130;
- and
- a fire retardant component present in and/or on the pulp fiber web in an amount of at least about 20 lbs fire retardant component per ton of the pulp fiber web, the fire retardant component comprising:
- at least about 10% by weight of the fire retardant component of one or more endothermic fire retardants;
- and
- up to about 90% by weight of the fire retardant component of one or more other fire retardants;
- and
- one or more fire retardant distributing surfactants in an amount sufficient to distribute the fire retardant component in and/or on the pulp fiber web;
- wherein the fire retardant component is in an amount and is distributed in and/or on the pulp fiber web in a manner so that the fire resistant pulp fiber web passes one or more of the following tests:
- the UL 94 HBF test, the Horizontal Burn Through test, or the ASTM D 5132-04 test.
Dependencies are inferred from the claim text.