Compositions and methods for filling dried cellulosic fibers wit

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

1992-10-07

1994-01-04

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

162 9, 1621813, 1621817, 162182, 162183, D21H 1767

Patent

active

052756998

ABSTRACT:
There is disclosed a filled cellulosic fiber composition, as well as a method for filling dried cellulosic fibers with an inorganic 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 composition 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 include 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.

REFERENCES:
patent: 2399982 (1946-05-01), Britt
patent: 2583548 (1952-01-01), Craig
patent: 3029181 (1962-10-01), Thomsen
patent: 4510020 (1985-04-01), Green et al.
patent: 5096539 (1992-03-01), Allan
patent: 5122230 (1992-06-01), Nakajima

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