Compositions and methods for filling dried cellulosic fibers...

Details Compositions and methods for filling dried cellulosic fibers... Compositions and methods for filling dried cellulosic fibers...

D - Textiles, Paper

21

H

D21H 11/20 (2006.01) D06M 11/00 (2006.01) D21H 17/66 (2006.01) D21H 17/70 (2006.01)

Patent

CA 2145519

These is disclosed a filled cellulosic fiber composition, as well as a method for filling dried cellulosic fibers with an inor- ganic filler by contacting the dried fibers with a first salt solution, followed by contact with a second salt solution. The first and second salt solutions combine to form a precipitate within the cell wall of the cellulosic fibers. The filled cellulosic fiber composi- tion may be made into a variety of paper products, including paper, having a high filler content. The precipitates of the present invention include carbonates, phosphates, silicates and borates of aluminum, barium, calcium, magnesium and zinc. The first salts include carbonates, phosphates, silicates and borates of sodium, ammonium, potassium and lithium, and the second salts in- clude chlorides, nitrates and sulfates of aluminum, barium, calcium, magnesium and zinc. In a preferred embodiment, the first salt is sodium carbonate, the second salt is calcium nitrate or calcium chloride, and the precipitate is calcium carbonate.

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