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Paper, board and cardboard having high dry strength are produced by the addition of cationic, anionic and/or amphoteric starch as dry strength agents to the paper stock and drainage of the paper stock with sheet formation in the presence of cationic polymers as retention aids for starch, and cationi

Paper, board and cardboard having high dry strength are produced by the addition of cationic, anionic and/or amphoteric starch as dry strength agents to the paper stock and drainage of the paper stock with sheet formation in the presence of cationic polymers as retention aids for starch, and cationic polymeric retention aids are used for increasing the retention of dry strength agents comprising cationic, anionic and/or amphoteric starch in the production of paper, board and cardboard.

대표청구항 ▼

Paper, board and cardboard having high dry strength are produced by the addition of cationic, anionic and/or amphoteric starch as dry strength agents to the paper stock and drainage of the paper stock with sheet formation in the presence of cationic polymers as retention aids for starch, and cationi

Paper, board and cardboard having high dry strength are produced by the addition of cationic, anionic and/or amphoteric starch as dry strength agents to the paper stock and drainage of the paper stock with sheet formation in the presence of cationic polymers as retention aids for starch, and cationic polymeric retention aids are used for increasing the retention of dry strength agents comprising cationic, anionic and/or amphoteric starch in the production of paper, board and cardboard. polystyrene acrylics, styrene butadiene, and combinations thereof. 16. The method of claim 11, wherein the cellulose fibers are derived from fibers selected from the group consisting of primary paper fibers, secondary paper fibers, and cotton linters. 17. The method of claim 11, wherein the non-fibrous filler is selected from the group consisting of kaolin clay, calcium carbonate, silica, vermiculite, ball clay, talc, mica, gypsum, and combinations thereof. 18. The method of claim 1, wherein the aqueous overlay is a substantially uniform aqueous mixture having between about 15 to about 35 wt. % solids and the overlay binder is selected from the group consisting of a cooked starch and a foaming agent. 19. The method of claim 18, wherein the aqueous overlay comprises: TBL nodulated wool about 50 to about 85 dry wt. % cellulose fibers 0 to about 10 dry wt. % non-fibrous filler 0 to about 15 dry wt. % expanded perlite 0 to about 20 dry wt. % boric acid 0 to about 1 dry wt. % dry broke 0 to about 35 dry wt. % slipping agent 0 to about 1 dry wt. % additives 0 to about 1 dry wt. %, wherein the additives are selected from the group consisting of dispersants, defoaming agents, fungicides, and combinations thereof with the proviso that defoaming agents are absent in the overlay when a foaming agent is present therein. 20. The method of claim 19, wherein the overlay binder is cooked starch comprising about 5 to about 12 dry wt. % of the aqueous overlay and is selected from the group consisting of pearl cornstarch, wheat starch, potato starch, and combinations thereof. 21. The method of claim 1, wherein the overlay binder comprises about 2 to about 8 wt. % of a granular binder and 0 to about 1 dry wt. % aluminum sulfate. 22. The method of claim 21, wherein the granular binder is selected from the group consisting of pearl cornstarch, wheat starch, potato starch, polystyrene, polyvinyl acetate, polystyrene acrylics, styrene butadiene, and combinations thereof. 23. The method of claim 19, wherein the cellulose fibers are derived from fibers selected from the group consisting of primary paper fibers, secondary paper fibers and cotton linters. 24. The method of claim 19, wherein the non-fibrous filler is selected from the group consisting of kaolin clay, calcium carbonate, silica, vermiculite, ball clay, talc, mica, gypsum, and combinations thereof. 25. The method of claim 1, wherein the nodulated wool is selected from the group consisting of nodulated mineral wool, nodulated metal slag wool, nodulated chopped glass, nodulated rock wool, and combinations thereof. 26. The method of claim 1, wherein in step (c) the aqueous felt in de-watered by pressing and then by operably engaging the aqueous felt with a vacuum. 27. The method of claim 1, wherein the aqueous overlay of step (d) is formed by the steps comprising: forming a mixture comprising an overlay binder, wool fibers, and water; and agitating the mixture for an amount of time sufficient to substantially uniformly distribute and nodulate the wool fibers. 28. The method of claim 1, wherein the overlay binder is a foaming agent. 29. The method of claim 1, wherein the overlay further comprises a slipping agent. 30. The method of claim 28, wherein the foaming agent comprises about 0.1 to about 1 dry wt. % of the aqueous overlay and is selected from the group consisting of bis(2-hydroxyethyl) tallowalkylamine, sodium laureth (1) sulfate, ammonium deceth (3) sulfate, ammonium C6-10alcohol ethoxysulfate, sodium dodecylbenzene sulfonate, and combinations thereof. 31. The method of claim 29, wherein the slipping agent is selected from the group consisting of isostearamidopropyl ethyl dimonium ethosulfate and polyethylene oxide. 32. A method of making a durable acoustical panel comprising: (a) forming an aqueous slurry comprising a fibrous filler, a base binder, and water; (b)