Process for bonding chemical additives on to substrates containing cellulosic materials and products thereof

A tissue product comprising:

• a paper sheet containing cellulose fibers that have been modified to form a first moiety, the first moiety being present at the surface of the cellulose fibers;
• a chemical additive comprising a softener or a humectant, the chemical additive containing a second moiety that has formed a chemical linkage with the first moiety;
• wherein the first moiety comprises an aldehyde, an epoxy or an anhydride group and the second moiety comprises an amine, a thiol, an amide, a sulfonamide, or a sulfinic acid group;
• or
• the first moiety comprises an amine, a thiol, an amide, a sulfonamide or a sulfinic acid group and the second moiety comprises an aldehyde, a carboxylate, an epoxy, or an anhydride group.

A method of making a paper sheet comprising:

• forming a paper web from an aqueous suspension of cellulose fibers;
• modifying at least a portion of the cellulose fibers says to form a first moiety on the surface of the fibers;
• contacting the modified fibers with a chemical additive, the chemical additive comprising a softener or a humectant, the chemical additive containing a second moiety that forms a chemical linkage with the first moiety;
• wherein the first moiety comprises an aldehyde, an epoxy or an anhydride group and the second moiety comprises an amine, a thiol, an amide, a sulfonamide, or a sulfinic acid group;
• or
• the first moiety comprises an amine, a thiol, an amide, a sulfonamide or a sulfinic acid group and the second moiety comprises an aldehyde, a carboxylate, an epoxy, or an anhydride group.