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Precipitated calcium carbonate pigment, especially for use in inkjet printing paper coatings

An inkjet printing, inkjet technology, applied in calcium carbonate/strontium/barium, printing, nanotechnology for materials and surface science, etc., can solve problems such as preparation of paper coating pigments that are not specifically pointed out

Inactive Publication Date: 2012-02-22
OMYA INT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these patents specifically addresses coating pigments to be used in the preparation of paper

Method used

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  • Precipitated calcium carbonate pigment, especially for use in inkjet printing paper coatings
  • Precipitated calcium carbonate pigment, especially for use in inkjet printing paper coatings
  • Precipitated calcium carbonate pigment, especially for use in inkjet printing paper coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0173] Method of the present invention, step A with magnesium sulfate and zinc sulfate:

[0174] 150 kg of quicklime were added to 1300 liters of tap water in a stirred reactor. Before the lime is added, the water temperature is adjusted to 40°C.

[0175] The quicklime was digested for 25 minutes under continuous stirring, and the resulting calcium hydroxide slurry ("milk of lime") at 13.1% w / w solids content was sieved on a 100 micron sieve.

[0176] CaCO3 precipitate is introduced into a baffled 1000 liter aerated agitator with gas dispersion unit, stainless steel carbide tubes for introducing the CO2 / air flow into the impeller and probes for monitoring the pH and conductivity of the suspension In a cylindrical stainless steel reactor.

[0177] 700 liters of the calcium hydroxide suspension obtained in the above digestion step were added to the carbonization reactor and the temperature of the reaction mixture was adjusted to the desired starting temperature of 20 °C.

...

Embodiment 2

[0191] Process of the invention, enrichment of the product of Example 1 (step B):

[0192] 2210 g of precipitated calcium carbonate slurry obtained according to step A of the process as described in Example 1 was cooled to 25° C. and dewatered in step B using a pressurized filter.

[0193] A filter cake with a solids content of approximately 43% w / w was obtained.

[0194] The filtrate was collected and used for redispersion of the filter cake.

[0195] 50 g of the filtrate obtained in the dehydration step as described above was added to a 1 liter dispersing device equipped with an impeller and redispersed without using any dispersing agent.

[0196] In this mixture, the filter cake obtained in the above dehydration step with a residual moisture content of 57% w / w was gradually added to the dispersing device under continuous mixing.

[0197] After each filter cake addition and subsequent homogenization, the Brookfield viscosity of the slurry was measured at 100 rpm. Cake add...

Embodiment 3

[0205] Process of the invention, enrichment of the product of Example 1 (step B):

[0206] 2210 g of precipitated calcium carbonate slurry obtained according to the method described in Example 1 was cooled to 25° C. and dewatered using a pressure filter. The filtrate was collected and used for subsequent filter cake redispersion.

[0207] 30 g of the filtrate obtained in the dehydration step as described above was added to a 1 liter dispersing device equipped with an impeller and redispersed without using any dispersing agent.

[0208] In this mixture, the filter cake obtained in the above dehydration step with a residual moisture content of 36.4% w / w was gradually added to the dispersing device under continuous mixing. After each filter cake addition and subsequent homogenization, the Brookfield viscosity of the slurry was measured at 100 rpm. Cake addition was stopped when the Brookfield viscosity reached a specified maximum of approximately 1000 mPas.

[0209] At this ...

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Abstract

Novel and innovative PCC pigments, having a reduced production cost, able to be used in a paper coating formulations to manufacture coated high-quality matt papers, in particular for inkjet applications. Process for the preparation of same, using a reduced flow rate of a carbon dioxide-containing gas in the PCC carbonation step, which produces stable, porous, agglomerates of PCC featuring unique properties and structure, this step being followed by an upconcentration step to increase the solids content.

Description

technical field [0001] The present invention relates to novel mineral pigments of the precipitated calcium carbonate class (PCC). [0002] More specifically, the present invention relates to novel and ingenious PCC pigments which can be used in paper coating formulations to produce coated high quality matte papers, especially for inkjet applications, which have a print quality comparable to that of commercially available Coated high-quality matte inkjet paper is the same, but coated with pigments that are less expensive to produce. [0003] The invention also relates to the production of said novel mineral pigments of the PCC type in the form of slurries with a solids content suitable for use in coating machines such as Varibar TM , air knife, curtain or doctor blade off-line coater for inkjet paper coating. Background technique [0004] technical problem [0005] There is currently a need for coated high quality matte papers, especially papers suitable for inkjet applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18C09C1/02D21H19/38
CPCC01P2006/12C01P2004/10C01P2004/54C01P2004/64C01F11/185C01F11/182C01P2004/50C01P2004/51B82Y30/00C01P2004/61C01F11/181B41M5/5218C01F11/18C09C1/02D21H19/38
Inventor M·克斯贝格尔M·波尔
Owner OMYA INT AG
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