Modification of layered double hydroxides

Patent metadata

Field	Value
Publication number	US-9382123-B2
Application number	US-201214367437-A
Country	US
Kind code	B2
Filing date	Dec 18, 2012
Priority date	Dec 22, 2011
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

Disclosed herein is a process for modifying a layered double hydroxide (LDH), the process comprising a. providing a material comprising a layered double hydroxide of formula: [M z+ 1-x M′ y+ x (OH) 2 ] q+ (X n− ) q/n .bH 2 O wherein M and M′ are metal cations, z is 1 or 2, x is 0.1 to 1, b is 0 to 5, y is 3 or 4, X is an anion, n is 1 to 3 and q is determined by x, y and z; b. optionally washing the material at least once with a mixture of water and a mixing solvent miscible with water; and c. washing the material obtained in a. or b. at least once with at least one first solvent, the first-solvent being miscible with water and having a solvent polarity P′ in the range of 3.8 to 9 to obtain a modified layered double hydroxide.

First claim

The invention claimed is:

1. A process comprising
a. providing a material comprising a layered double hydroxide (LDH) of formula:
[M z+ 1-x M′ y+ x (OH) 2 ] q+ (X n− ) q/n .b H 2 O

wherein M and M′ are metal cations, z is 1 or 2, x is 0.1 to 1, b is 0 to 5, y is 3 or 4, X is an anion, n is 1 to 3 and q is determined by x, y and z,

b. optionally washing the material at least once with a mixture of water and a mixing solvent miscible with water;
c. washing the material obtained in a. or b. at least once with at least a first solvent, the first solvent being miscible with water and having a solvent polarity P′ in the range of 3.8 to 9 to obtain a modified layered double hydroxide;
d. dispersing the modified layered double hydroxide in a second hydrocarbon solvent to form a hydrocarbon-dispersed layered double hydroxide; and
e. dissolving a polymer material in the hydrocarbon-dispersed layered double hydroxide to form a polymer loaded hydrocarbon dispersion.

2. The process as claimed in claim 1 , wherein z is 2 and M is Ca, Mg, Zn, Fe or mixtures thereof.

3. The process as claimed in claim 1 , wherein M′ is Al.

4. The process as claimed in claim 1 wherein the particle size of the LDH particles is in the range of 1 nm to 50 micron.

5. The process as claimed in claim 1 wherein X is an anion selected from halide, inorganic oxyanion, anionic surfactants, anionic chromophores, an anionic UV absorbers or mixtures thereof.

6. The process as claimed in claim 1 wherein the mixing solvent is a C 1 to C 3 alcohol.

7. The process as claimed in claim 1 wherein the at least one first solvent is neutral or alkaline.

8. The process as claimed in claim 1 wherein the first solvent is selected from one or more of acetone, acetonitrile, dimethylformamide, dimethyl sulfoxide, dioxane, ethanol, methanol, n-propanol, 2-propanol, or tetrahydrofuran.

9. The process as claimed in claim 1 , wherein the second, hydrocarbon solvent comprises an aromatic compound.

10. The process as claimed in claim 1 wherein the second, hydrocarbon solvent is selected from one or more of benzene, toluene, xylene, mesitylene, benzyl alcohol, chlorobenzene, o-dichlorobenzene, or trichlorobenzene.

11. The process as claimed in claim 1 wherein the dissolving comprises heating.

12. The process as claimed in claim 1 further comprising precipitating a composite material from the polymer loaded hydrocarbon dispersion.

13. The process as claimed in claim 1 wherein the polymer material comprises at least one polymer selected from a polyolefin, vinyl polymers, saturated esters or mixtures thereof.

14. The process as claimed in claim 13 , wherein the polyolefin comprises polyethylene and/or polypropylene.

15. The process as claimed in claim 1 wherein the LDH is present in a range of 0.01 to 85 wt % based on the weight of polymer.

Assignees

• Scg Chemicals Co Ltd

Inventors

• O'Hare Dermot
• Wang Qiang

Classifications

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C01P2002/88

  by thermal analysis data, e.g. TGA, DTA, DSC · CPC title

• C01P2002/84

  by UV- or VIS- data · CPC title

• C08K2003/2206

  of calcium, strontium or barium · CPC title

• C01P2002/01

  depicted by a TEM-image · CPC title