The invention concerns a wrapper paper which is suitable for use on aerosol-generating articles and which comprises pulp fibers and a char-former, wherein the pulp fibers make up at least 70% and at most 95% of the mass of the wrapper paper and the char-former is contained in a concentration of at least 5% and at most 20% with respect to the mass of the wrapper paper and is present in a concentration in the wrapper paper such that the quotient r=R.sub.T/R.sub.o of the tensile strength R.sub.o, measured in accordance with ISO 1924-2:2008 under the conditions of ISO 187:1990, and of the tensile strength R.sub.T, measured in accordance with ISO 1924-2:2008 under the conditions of ISO 187:1990 after the wrapper paper has been exposed to a temperature of 230° C. for one minute, is at least 0.20 and at most 0.90.

Disclosed herein are processes for producing precipitated calcium carbonate. In one embodiment, the process comprises the steps of a) providing an aqueous slurry of calcium hydroxide; b) adding a polysaccharide to the slurry of calcium hydroxide; and c) carbonating the slurry of calcium hydroxide. The polysaccharide comprises poly alpha-1,3-glucan, a poly alpha-1,3-glucan ester compound as disclosed herein, or a poly alpha-1,3-glucan ether compound as disclosed herein. The precipitated calcium carbonate produced by the process can be useful in making paper.

An object of the present invention is to provide, in particular, flame-resistant paper for a radio wave absorber member, the flame-resistant paper being unlikely to break during the production process and having favorable producibility in addition to being suitable for a radio wave absorber member and having high flame resistance. The flame-resistant paper for a radio wave absorber member according to the present invention contains pulp, aluminum hydroxide, guanidine phosphate, a binder, and a conductive substance, in which the content of the pulp is 5 to 20 mass%, the content of the aluminum hydroxide is 40 to 70 mass%, the content of the guanidine phosphate is 10 to 20 mass%, the content of the binder is 5 to 10 mass%, and the content of the conductive substance is 0.1 to 12 mass%.

An object of the present invention is to provide, in particular, flame-resistant paper for a radio wave absorber member, the flame-resistant paper being unlikely to break during the production process and having favorable producibility in addition to being suitable for a radio wave absorber member and having high flame resistance. The flame-resistant paper for a radio wave absorber member according to the present invention contains pulp, aluminum hydroxide, guanidine phosphate, a binder, and a conductive substance, in which the content of the pulp is 5 to 20 mass%, the content of the aluminum hydroxide is 40 to 70 mass%, the content of the guanidine phosphate is 10 to 20 mass%, the content of the binder is 5 to 10 mass%, and the content of the conductive substance is 0.1 to 12 mass%.

A wrapper paper is described that is suitable for use on aerosol-generating articles and which comprises pulp fibers and one or more polyphosphates, wherein the pulp fibers make up at least 55% and at most 95% of the mass of the wrapper paper and the polyphosphates are together contained in a concentration of at least 5% and at most 30% with respect to the mass of the wrapper paper. In this regard, the polyphosphates are compounds with the molecular formula M.sub.n+2P.sub.nO.sub.3n+1 or M.sub.n[H.sub.2PO.sub.nO.sub.3n+1], wherein n is at least 2 and at most 100 and M is a monovalent metal or ammonium (NH.sub.4.sup.+).

A wrapper paper is described that is suitable for use on aerosol-generating articles and which comprises pulp fibers and one or more polyphosphates, wherein the pulp fibers make up at least 55% and at most 95% of the mass of the wrapper paper and the polyphosphates are together contained in a concentration of at least 5% and at most 30% with respect to the mass of the wrapper paper. In this regard, the polyphosphates are compounds with the molecular formula M.sub.n+2P.sub.nO.sub.3n+1 or M.sub.n[H.sub.2PO.sub.nO.sub.3n+1], wherein n is at least 2 and at most 100 and M is a monovalent metal or ammonium (NH.sub.4.sup.+).

A flame retardant paper includes pulp, aluminum hydroxide, guanidine phosphate and guanidine sulfamate, wherein the content of the pulp is 10 to 35% by mass and the content of the aluminum hydroxide is 40 to 70% by mass, and the total content of the guanidine phosphate and the guanidine sulfamate is 0.1 to 10% by mass based on the contents of the flame retardant paper.

The present invention is intended to provide ultrafine cellulose fibers capable of enhancing the transparency of an ultrafine cellulose fiber-dispersed solution having phosphorous acid groups. The present invention relates to a method for producing cellulose fibers, comprising: mixing a compound having a phosphorous acid group and/or a salt thereof and urea and/or a urea derivative into a cellulose raw material to obtain a phosphorous acid esterified cellulose raw material, and performing a fibrillation treatment on the phosphorous acid esterified cellulose raw material to obtain cellulose fibers having a fiber width of 1000 nm or less and having a phosphorous acid group, wherein, in obtaining the phosphorous acid esterified cellulose raw material, the decomposition percentage of the urea and/or the urea derivative is set to be 90% or less.

The present invention provides aqueous compositions for treating fluff pulp comprising (i) one or more acrylic acid polymers containing phosphinate groups and having a weight average molecular weight of from 1,000 to 6,000 and (ii) from 5 to 50 wt. %, based on the total solids weight of the aqueous compositions, of one or more polyethylene glycols, having a formula weight of from 150 to 7,000, or, preferably, from 200 to 600. The present invention also provides individualized, intrafiber crosslinked cellulosic fibers comprising the cellulosic fiber and, in cured form, the aqueous compositions, as well as methods of making the individualized, intrafiber crosslinked cellulosic fibers.

Objects of the present invention are to provide a phosphoric acid-esterified fine cellulose fiber of which slurry shows superior transparency, and to provide a method for producing a phosphorylated fine cellulose fiber showing superior transparency with good efficiency and high yield. According to the present invention, there is provided a phosphoric acid-esterified fine cellulose fiber, of which 0.2 mass % aqueous dispersion shows a solution haze of 15% or lower.