Layered silicate partially modified with amino acid

Patent metadata

Field	Value
Publication number	US-12378129-B2
Application number	US-202218571953-A
Country	US
Kind code	B2
Filing date	Jul 8, 2022
Priority date	Jul 12, 2021
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

The invention relates to a layered silicate having interlayer cations, wherein the interlayer cations comprise a) inorganic monovalent cations comprising at least one of Na + , K + , and Li + , and b) organic cations comprising at least one protonated amino acid.

First claim

The invention claimed is:

1. A layered silicate having interlayer cations, wherein the interlayer cations comprise
a) inorganic monovalent cations comprising at least one of Na + , K + , and Li + , and
b) organic cations comprising at least one protonated amino acid,
wherein the molar ratio of the inorganic monovalent cations a) to organic cations b) is in the range of 0.20:0.80 to 0.80:0.20.

2. The layered silicate according to claim 1 , wherein the layered silicate is a synthetic layered silicate.

3. The layered silicate according to claim 1 , wherein the layered silicate is a naturally occurring layered silicate modified with a protonated amino acid.

4. The layered silicate according to claim 1 , wherein the protonated amino acid comprises at least one of lysine, ornithine, and alanine.

5. The layered silicate according to claim 1 , wherein the interlayer cations between the layers alternately comprise more than 60 mole-% of protonated amino acids and more than 60 mole-% of inorganic cations selected from Na + , K + , and Li + .

6. A process for preparing a layered silicate having interlayer cations, comprising
i) providing a layered silicate,
ii) determining the cation exchange capacity of the layered silicate
iii) contacting the layered silicate with a protonated amino acid in an aqueous environment, wherein the molar amount of protonated amino acid corresponds to less than 100% of the cation exchange capacity of the layered silicate,
the resulting layered silicate having interlayer cations, wherein the interlayer cations comprise
a) inorganic monovalent cations comprising at least one of N + , K + , and Li + and
b) organic cations comprising at least one protonated amino acid,
wherein the molar ratio of the inorganic monovalent cations a) to organic cations b) is in the range of 0.20:0.80 to 0.80:0.20.

7. The process according to claim 6 , wherein the protonated amino acid comprises at least one lysine, ornithine, and alanine.

8. The process according to claim 6 , wherein the layered silicate provided in step i) has the composition Na x [Mg 3-z Li y ]Si 4 O 10 (T) 2 , wherein
x is in the range of 0.40 to 0.90,
y is in the range of 0.00 to 0.90,
z is in the range of 0.20 to 0.90,
T independent of each occurrence represents F or OH, and
x +(3− z )+ y≤ 4.

9. The process according to claim 6 , further comprising a step of drying the layered silicate after treatment with protonated amino acid.

10. A composition comprising at least one binder and the layered silicate according to claim 1 .

11. The composition according to claim 10 , wherein the binder comprises a polymer.

12. The composition according to claim 11 , wherein the binder comprises at least one of an aqueous polymer solution and an aqueous polymer dispersion.

13. The layered silicate according to claim 1 , wherein the molar ratio of the inorganic monovalent cations a) to organic cations b) is in the range of 0.75:0.25 to 0.30:0.70.

14. The layered silicate according to claim 1 , wherein the molar ratio of the inorganic monovalent cations a) to organic cations b) is in the range of 0.70:0.30 to 0.35:0.65.

Assignees

• Byk Chemie Gmbh

Inventors

• Kalo Hussein
• Böhmer Maximilian
• Krappe Udo
• Heitzer Nico

Classifications

• C08K9/04

  Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} · CPC title

• C01P2002/20

  Two-dimensional structures · CPC title

• C09D7/62

  modified by treatment with other compounds · CPC title

• C01B33/44 Primary

  Products obtained from layered base-exchange silicates by ion-exchange with organic compounds such as ammonium, phosphonium or sulfonium compounds or by intercalation of organic compounds, e.g. organoclay material · CPC title

• C01B33/38 Primary

  Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type {(activation of naturally occurring clays B01J20/12; pillared layered base-exchange silicates B01J29/049)} · CPC title