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Filler-fiber composite

a filler fiber and composite technology, applied in the field of filler fiber composites, can solve the problem that no prior related art discloses a filler fiber composi

Inactive Publication Date: 2004-06-10
SPECIALITY MINERALS (MICHIGAN) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Pat. No. 5,731,080 teaches in-situ precipitation wherein the majority of a calcium carbonate trap the microfiber by reliable and non-reliable mechanical bonding without binders or retention aids.
However, none of the prior related art discloses a filler fiber composite where the morphology of the filler is predetermined prior to introducing fibers, a method for its production nor its use in paper or paper products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] Scalenohedral PCC

[0036] Reacted 15 liters of water with 3 kilogram CaO at 50 degrees Celsius producing a 20 percent by weight Ca(OH).sub.2 slake. The Ca(OH).sub.2 slake was then screened at -325 mesh producing a screened slake that was transferred to a first 30-liter double jacketed stainless steel reaction vessel with an agitation of 615 revolutions per minute (rpm). 0.1 percent citric acid, by weight of total theoretical CaCO.sub.3 to be produced, was added to the screened slake in a 30-liter reaction vessel and the temperature of the contents brought to 40 degrees Celsius. Began addition of 20 percent CO.sub.2 gas in air (14.83 standard liter minute CO.sub.2 / 59.30 standard liter minute air) to the 30-liter reaction vessel to produce a 2:1 Ca (OH).sub.2 / CaCO.sub.3 slurry. At this point, CO.sub.2 gassing was stopped and the slurry was transferred to an agitated 20-liter storage vessel.

[0037] 2 liters of the 2:1 Ca(OH).sub.2 / CaCO.sub.3 slurry was transferred to a first 4-lite...

example 2

[0038] Aragonitic PCC

[0039] Reacted 10.5 liters of water with 2.1 kilograms CaO at 50 degrees Celsius producing a 15 percent by weight Ca(OH).sub.2 slake. The Ca(OH).sub.2 slake was then screened at -325 mesh producing a screened slake that was transferred to a 30-liter double jacketed stainless steel reaction vessel with an agitation of 615rpm. Added 0.1 percent by weight of a high surface area (HSSA) aragonitic seed (surface area .about.40 meters squared per gram, approximately 25 percent solids) to the 30-liter reaction vessel and brought the temperature of the contents to 51 degrees Celsius. A "seed" is defined as a fully converted aragonitic crystal that has been endpointed and milled to a high specific surface area (i.e. greater than 30 meters squared per gram and typically a particle size of 0.1 to 0.4 microns). Began addition of 10 percent CO.sub.2 gas in air (5.24 standard liter minute CO.sub.2 / 47.12 standard liter minute air) to the 30-liter stainless steel, double jackete...

example 3

[0041] Rhombohedral PCC

[0042] Reacted 15 liters of water with 3 kilograms CaO at 50 degrees Celsius producing a 20 percent by weight Ca(OH).sub.2 slake. The Ca(OH).sub.2 slake was screened at -325 mesh producing a screened slake that was transferred to an agitated 20-liter storage vessel. Transferred 2-liters of the screened slake from the 20-liter storage vessel to a first 4-liter agitated, stainless steel, double jacketed reaction vessel and began agitation at 1250 rpm. Added 0.03 percent citric acid by weight of theoretical CaCO.sub.3 to the first 4-liter reaction vessel and raised the temperature of the contents to 50 degrees Celsius. Added 20 percent CO.sub.2 gas in air (1.44 standard liter minute CO.sub.2 / 5.77 standard liter minute air) to the first 4-liter reaction vessel until a pH of 7.0 was achieved producing a 100 percent CaCO.sub.3 slurry. To the screened slake in the 20-liter storage vessel, added a solution of 1.3 percent by weight of Na.sub.2CO.sub.3, based on theoret...

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Abstract

The present invention relates to a filler-fiber composite, a process for its production, the use of such in the manufacture of paper or paperboard products and to paper produced therefrom. More particularly the invention relates to a filler-fiber composite in which the morphology and particle size of the mineral filler are established prior to the development of the bond to the fiber. Even more particularly, the present invention relates to a PCC filler-fiber composite, wherein the desired optical and physical properties of the paper produced therefrom are realized.

Description

[0001] The present invention relates to a filler-fiber composite, a process for its production, the use of such in the manufacture of paper or paperboard products and to paper produced therefrom. More particularly the invention relates to a filler-fiber composite in which the morphology and particle size of the mineral filler are established prior to the development of the bond to the fiber. Even more particularly, the present invention relates to a PCC filler-fiber composite, wherein the desired optical and physical properties of the paper produced therefrom are realized.[0002] Loading particulate fillers such as calcium carbonate, talc and clay on fibers for the subsequent manufacture of paper and paper products continues to be a challenge. A number of methods, having some degree of success, have been used to address this issue. To insure that fillers remain with or within the fiber web, retention aids have been used, direct precipitation onto the fibers have been used, a method t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/00D21H11/16D21H17/15D21H17/67D21H17/70D21H23/04
CPCD21H11/16D21H17/15D21H23/04D21H17/70D21H17/675D21H3/00
Inventor HUGHES, GEOFFREY LAMAR
Owner SPECIALITY MINERALS (MICHIGAN) INC
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