Precipitated siliceous products used in paper
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IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0949720
(1978-10-10)
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발명자
/ 주소 |
- Wason Satish K. (Havre de Grace MD) Mays Robert K. (Havre de Grace MD)
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출원인 / 주소 |
- J. M. Huber Corporation (Locust NJ 02)
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인용정보 |
피인용 횟수 :
9 인용 특허 :
0 |
초록
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A method for producing a precipitated silicon dioxide having a new combination of physical and chemical properties is disclosed. The pigments are produced by acidulating a solution of an alkali metal silicate with an acid under controlled precipitation conditions. The aqueous reaction medium compris
A method for producing a precipitated silicon dioxide having a new combination of physical and chemical properties is disclosed. The pigments are produced by acidulating a solution of an alkali metal silicate with an acid under controlled precipitation conditions. The aqueous reaction medium comprising the precipitated silica is then post-conditioned by introducing a second silicate solution into the reaction vessel and thereafter adding additional acid to react with the said second silicate solution. By varying the amount of the silicate employed in the post-conditioning step, a product is obtained which has a unique combination of physical and chemical properties including reduced wet cake moisture content, high surface areas and oil absorptions, improved surface activity, friability, wetting characteristics, and the like. The product has particular utility for use as a rubber reinforcing agent because of its increased surface activity and oil absorption, etc. The product, however, may be used in paints, paper, detergents, dentifrice compositions, molecular sieves, and polymeric compositions. An unexpected discovery of the invention involves the production of a rubber reinforcing silica which has a decreased wet cake moisture content. In one particularly advantageous embodiment, an adduct material, such as aluminum, is added to control the refractive index and surface area of the product.
대표청구항
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A paper product having improved brightness, opacity, print quality, and strike-through reduction; said paper product including, as a filler, a finely divided, amorphous, precipitated silicon dioxide having: (a) a wet cake moisture content of from about 79.8 to 83.5%; (b) a structure index of from ab
A paper product having improved brightness, opacity, print quality, and strike-through reduction; said paper product including, as a filler, a finely divided, amorphous, precipitated silicon dioxide having: (a) a wet cake moisture content of from about 79.8 to 83.5%; (b) a structure index of from about 395 to 505; (c) an oil absorption of from about 190 to 202 cc/100 grams; (d) a void volume of from about 3.55 to 4.14 cc Hg/g SiO2; (e) a BET surface area of from about 120 to 153 m2/g; and (f) a percent friability of from about 20 to 98%; said silicon dioxide being produced by the following steps: (1) introducing a known value of an aqueous alkali metal silicate solution into a reaction vessel; said alkali metal silicate having the formula M2O(SiO2)X, wherein M is an alkali metal selected from the group consisting of sodium and potassium, and X is from 2 to 4 inclusive; (2) continuously agitating said aqueous solution of said alkali metal silicate in said reaction vessel; (3) contacting said alkali metal silicate solution with an acid to form an aqueous suspension of finely divided precipitated silicon dioxide particulates; (4) continuing the addition of said acid until the precipitation of said silicon dioxide is at least 99% complete; (5) introducing a second solution of an aqueous alkali metal silicate into said reaction vessel containing said finely divided precipitated silicon dioxide; (6) contacting the reaction mass formed by step (5) with an acid, said acid being added in an amount theoretically required to react with the silicate of said second aqueous solution of said alkali metal silicate; (7) filtering the reaction mass thus formed; and (8) washing, drying, and recovering the resulting silicon dioxide.
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Mathur,Vijay K.; Mathur,Varun K., Method and apparatus for production of precipitated calcium carbonate and silicate compounds in common process equipment.
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Richard F. Palmer ; Mike S. D. Juang ; James S. Johnson ; Barbara R. Atha ; David T. Lee ; Larry L. Malcom, Method for manufacturing paper products comprising polymerized mineral networks.
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Mathur, Vijay K., Multi-phase calcium silicate hydrates, methods for their preparation, and improved paper and pigment products produced therewith.
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Storeck Arnold (Frankfurt DEX), Paper containing a filler.
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Kaneko, Yuriko; Iwamoto, Takuya; Sangawa, Ushio; Hashimoto, Masahiko; Mino, Norihisa, Porous silica material and optical microphone.
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