Modified mineral-based filler comprising copper salts

Patent metadata

Field	Value
Publication number	US-2018134898-A1
Application number	US-201615564273-A
Country	US
Kind code	A1
Filing date	Apr 22, 2016
Priority date	Apr 27, 2015
Publication date	May 17, 2018
Grant date	—

Abstract

The present invention relates to a modified mineral-based filler comprising at least one alkaline earth metal carbonate-comprising material, and at least one water insoluble copper salt comprising the copper mineral malachite in an amount of at least 10 wt.-%, which covers at least partially the surface of the at least one alkaline earth metal carbonate-comprising material, and a method of producing the same.

First claim

1 . A modified mineral-based filler comprising
at least one alkaline earth metal carbonate-comprising material, and at least one water insoluble copper salt, which covers at least partially the surface of the at least one alkaline earth metal carbonate-comprising material, wherein the at least one water insoluble copper salt comprises the copper mineral malachite in an amount of at least 10 wt.-%, based on the total weight of the at least one water insoluble copper salt.

2 . The modified mineral-based filler according to claim 1 , wherein the modified mineral-based filler is in form of an aqueous suspension.

3 . The modified mineral-based filler according to claim 1 , wherein the modified mineral-based filler is a dried modified mineral-based filler, preferably in powder form, and the moisture content of the modified mineral-based filler is between 0.01 and 5 wt.-%, based on the total weight of the dried modified mineral-based filler.

4 . The modified mineral-based filler according to claim 1 , wherein the at least one alkaline earth metal carbonate-comprising material has a specific surface area (BET) from 1 to 200 m 2 /g, as measured using nitrogen and the BET method according to ISO 9277, and/or the total weight of copper on the total surface area of the at least one alkaline earth metal carbonate-comprising material is from 0.001 to 500 mg/m 2 .

5 . The modified mineral-based filler according to claim 1 , wherein the at least one water insoluble copper salt comprises malachite in an amount of at least 15 wt.-%, preferably at least 20 wt.-%, more preferably at least 25 wt.-%, and most preferably at least 30 wt.-%, based on the total weight of the at least one water insoluble copper salt, and/or the water insoluble copper salt further comprises a copper mineral selected from the group consisting of atacamite, deviline, posnjakite, brochantite, copper oxide, and mixtures thereof, and the total amount of these copper minerals including malachite is at least 15 wt.-%, preferably at least 20 wt.-%, more preferably at least 25 wt.-%, and most preferably at least 30 wt.-%, based on the total weight of the at least one water insoluble copper salt.

6 . The modified mineral-based filler according to claim 1 , further comprising at least one hydrophobising agent, which covers at least partially the surface of the modified mineral-based filler, wherein the total weight of the at least one hydrophobising agent on the total surface area of the modified mineral-based filler is from 0.001 to 10 mg/m 2 .

7 . The modified mineral-based filler according to claim 6 , wherein the specific surface area (BET) of the least one alkaline earth metal carbonate-comprising material is from 1 to 150 m 2 /g, preferably from 2 to 60 m 2 /g, and more preferably from 2 to 15 m 2 /g, as measured using nitrogen and the BET method according to ISO 9277, and/or the total weight of copper on the total surface area of the at least one alkaline earth metal carbonate-comprising material is from 0.001 to 300 mg/m 2 , preferably from 0.1 to 100 mg/m 2 , and more preferably from 1.5 to 30 mg/m 2 , and/or the total weight of the at least one hydrophobising agent on the total surface area of the modified mineral-based filler is from 0.001 to 9 mg/m 2 , preferably from 0.01 to 8 mg/m 2 , and more preferably from 0.1 to 4 mg/m 2 .

8 . The modified mineral-based filler according to claim 6 , wherein the at least one hydrophobising agent is selected from the group consisting of an aliphatic carboxylic acid having a total amount of carbon atoms from C 4 to C 24 and/or reaction products thereof, a mono-substituted succinic anhydride consisting of succinic anhydride mono-substituted with a group selected from a linear, branched, aliphatic and cyclic group having a total amount of carbon atoms from at least C 2 to C 30 in the substituent and/or reaction products thereof, a phosphoric acid ester blend of one or more phosphoric acid mono-ester and/or reaction products thereof and one or more phosphoric acid di-ester and/or reaction products thereof, polyhydrogensiloxane and reaction products thereof, an inert silicone oil, preferably polydimethylsiloxane, and mixtures thereof.

9 . A process for manufacturing a modified mineral-based filler comprising the following steps:
(i) providing at least one alkaline earth metal carbonate-comprising material, (ii) providing at least one water soluble copper salt, (iii) contacting the at least one alkaline earth metal carbonate-comprising material of step (i), the at least one water soluble copper salt of step (ii), and optionally water, in one or several steps to form a mixture, and (iv) heating the mixture obtained from step (iii) to a temperature in the range from 30 to 200° C. to form a modified mineral-based filler.

10 . The process according to claim 9 , wherein the process is a batch or a continuous process, preferably a continuous process.

11 . The process according to claim 9 or 10 , wherein the mixture formed in step (iii) is an aqueous suspension, and the process further comprises a step (v) of separating the modified mineral-based filler from the aqueous suspension after step (iv).

12 . The process according to claim 9 , wherein the process further comprises a step (vi) of drying the modified mineral-based filler after step (iv) or step (v), if present, at a temperature in the range from 60 to 200° C., preferably until the moisture content of the modified mineral-based filler is between 0.01 and 5 wt.-%, based on the total weight of the dried modified mineral-based filler.

13 . The process according to claim 9 , wherein the process further comprises a step of treating the modified mineral-based filler obtained in step (iv) during and/or after step (iv) in one or more steps with at least one hydrophobising agent at a temperature from 30 to 200° C., wherein the at least one hydrophobising agent is added in an amount such that the total weight of the at least one hydrophobising agent on the total surface area of the modified mineral-based filler is from 0.001 to 10 mg/m 2 .

14 . The process according to claim 9 , wherein the at least one water soluble copper salt of step (ii) is provided in form of an aqueous solution or aqueous suspension, preferably the aqueous solution or aqueous suspension comprises carbonate ions, wherein the carbonate ions are derived from a carbonate-comprising compound, which is dissolved in the aqueous solution or aqueous suspension of the at least one water soluble copper salt, or are generated in-situ by treating the aqueous solution or aqueous suspension of the at least one water soluble copper salt with gaseous carbon dioxide.

15 . The process according to claim 9 , wherein the at least one alkaline earth metal carbonate-comprising material of step (i) is provided in form of an aqueous suspension, preferably the aqueous suspension comprises carbonate ions, wherein the carbonate ions are at least partially derived from a carbonate-comprising compound, which differs from the at least one alkaline earth metal carbonate-comprising material of step (i) and is dissolved in the aqueous suspension, or are generated in-situ by treating the aqueous suspension of the at least one alkaline earth metal carbonate-comprising material with gaseous carbon dioxide.

16 . The process according to claim 9 , wherein the at least one alkaline earth metal carbonate-comprising material is a calcium carbonate-comprising material, preferably the at least one alkaline earth metal carbonate-comprising material is selected from the group consisting of ground calcium carbonate, preferably marble,

Assignees

• Omya Int Ag

Inventors

• Rentsch Samuel
• Welker Matthias
• Urwyler Simon
• Knupfer Martina Elisabeth
• Glaubitz Joachim
• Gane Patrick A C

Classifications

• A61K2800/621

  by inorganic compounds · CPC title

• C04B20/1066

  Oxides, Hydroxides · CPC title

• C01P2006/63

  a* (red-green axis) · CPC title

• C09C1/024 Primary

  Coating · CPC title

• A61K2800/412

  Microsized, i.e. having sizes between 0.1 and 100 microns · CPC title