Addition of endothermic fire retardants to provide near neutral pH pulp fiber webs

摘要

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.

主权项

1. 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; andup to about 90% by weight of the fire retardant component of one or more other fire retardants; andone 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.