Silicon comprising polymer coated particles

Patent metadata

Field	Value
Publication number	US-2016339446-A1
Application number	US-201515112788-A
Country	US
Kind code	A1
Filing date	Jan 22, 2015
Priority date	Jan 22, 2014
Publication date	Nov 24, 2016
Grant date	—

Abstract

The present invention relates to core-shell-particles, wherein the core comprises at least one metal, or a compound thereof, or a mixture of at least one metal or a compound thereof and at least one semimetal or a compound thereof, and the shell comprises at least one silicon comprising polymer, to a process for the preparation of these core-shell-particles, to the use of these core-shell-particles in an agglomeration-deagglomeration process, in particular in chemical, physical or biological test methods or separation processes, decontamination processes, water purification, recycling of electrical/electronic scrap or gravity separation, and to a process for separating at least one first material from a mixture comprising this at least one first material and at least one second material.

First claim

1 .- 20 . (canceled)

21 . Core-shell-particles, wherein the core comprises
(i) at least one metal or a compound thereof, or (ii) a mixture of at least one metal or a compound thereof and at least one semimetal or a compound thereof, and the shell comprises at least one silicon comprising polymer comprising repeat units of the general formula (I)
—[SiR 1 (OR 2 )—O]—  (I)

wherein R 1 is independently of another selected from hydrogen, linear or branched C 1 -C 18 -alkyl, unsubstituted or alkylsubstituted C 5 -C 12 -aryl, and R 2 is independently of another selected from hydrogen, linear or branched C 1 -C 18 -alkyl, unsubstituted or alkylsubstituted C 5 -C 12 -aryl, or —SiR 1 x (OR 2 ) 3-x , wherein x is 1 or 2 and R 1 and R 2 have independently of another the meanings as mentioned above.

22 . The core-shell-particles according to claim 21 , wherein the silicon comprising polymer further comprises repeat units of general formula (II)
—[SiR 1 2 —O]—  (II)
wherein R 1 is independently of another selected from hydrogen, linear or branched C 1 -C 18 -alkyl, unsubstituted or alkylsubstituted C 5 -C 12 -aryl.

23 . The core-shell-particles according to claim 21 , wherein the sum of the number of repeat units according to general formula (I), of repeat units according to general formula (II), if present, and the number of groups R 2 having the meaning —SiR 1 x (OR 2 ) 3-x , if present, is 10 to about 100,000.

24 . The core-shell-particles according to claim 21 , wherein the silicon comprising polymer comprising repeat unit of general formula (I) has a molecular weight Mw of about 500 to about 500000 g/mol (weight average).

25 . The core-shell-particles according to claim 21 , wherein the silicon comprising polymer is terminated with groups R I as defined in claim 21 and/or groups —OR 2 , wherein R 2 is independently of another selected from hydrogen, linear or branched C 1 -C 18 -alkyl or unsubstituted or alkylsubstituted C 5 -C 12 -aryl.

26 . The core-shell-particles according to claim 21 , wherein R 1 in the general formula (I) is independently of another selected from the group consisting of methyl, octyl, nonyl, decyl and phenyl.

27 . The core-shell-particles according to claim 21 , wherein the at least one metal or a compound thereof is an oxide of a metal, wherein the metal is selected from the group consisting of alkali metals, alkaline earth metals, metals of the third, fourth or fifth main group of the Periodic Table of the Elements, metals of the transition metal groups of the Periodic Table of the Elements, the lanthanides, the actinides and mixtures thereof.

28 . The core-shell-particles according to claim 21 , wherein the at least metal or a compound thereof is selected from the group consisting of iron oxides, magnetic iron oxides and mixtures thereof.

29 . The core-shell-particles according to claim 21 , wherein the core comprises at least one alloy comprising at least one metal, at least one semimetal or a mixture thereof.

30 . The core-shell-particles according to claim 21 , wherein the particle comprises a magnetic core.

31 . The core-shell-particles according to claim 21 , wherein the core has an average diameter of about 50 nm to about 500 μm.

32 . The core-shell-particles according to claim 21 , wherein the shell has an average thickness of about 0.1 to about 1000 nm.

33 . A process for the preparation of the core-shell-particles according to claim 21 , wherein the at least one core is coated with at least one silicon comprising polymer according to general formula (I) as defined in claim 21 .

34 . An agglomeration-deagglomeration process which comprises utilizing the core-shell-particles according to claim 21 .

35 . A process for separating at least one first material from a mixture comprising said at least one first material and at least one second material, wherein the process comprises the following steps:
(A) contacting of the mixture comprising the at least one first material and the at least one second material with at least one surface-modifying substance, optionally in the presence of at least one dispersant, (B) optionally, addition of at least one dispersant to the mixture obtained in step (A), (C) treatment of the dispersion from step (A) or (B) with at least one core-shell-particle according to claim 21 , wherein the at least one metal or a compound thereof, or a mixture of at least one metal or a compound thereof and at least one semimetal or a compound thereof is magnetic, and the at least one first material to which the at least one surface-modifying substance is attached and the at least one core-shell-particle form an agglomerate, and (D) separation of the agglomerate from step (C) from the mixture by application of a magnetic field.

36 . The process according to claim 35 wherein after process step (D), the process further comprises the following process step
(E) cleavage of the agglomerate which has been separated off in step (D) to obtain the at least one first material and the at least one core-shell-particle separately.

37 . The process according to claim 36 , wherein after cleavage according to step (E) the at least one magnetic core-shell particle is separated from the dispersion comprising said at least one magnetic core-shell-particle and said at least one first material by means of a permanent magnet or an electromagnet.

38 . The process according to claim 35 , wherein after step (D) the following step (F) is conducted:
(F) further processing of the particles or of the agglomerate from step (D) via smelting, extracting and/or wet chemical refining. and no step (E) is conducted.

39 . The process according to claim 35 , wherein in process steps (A) and/or (B) a dispersant is present and the dispersion comprises from about 5 to about 40% by weight solid content wherein the solid content is based on the total amount of solids present.

40 . The process according to claim 35 , wherein after completion of process step (D), (E), or (F) at least about 70% of the core-shell-particles are recovered from the process.

Assignees

• Basf Se
• Basf Corp

Inventors

• Blasberg Florian
• Luz Andreas
• Shishkov Igor
• Gilbert David J
• Rohde Wolfgang

Classifications

• B22F1/054

  Nanosized particles · CPC title

• B22F1/148

  Agglomerating · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• C02F1/545

  Silicon compounds · CPC title