Patent ID: 11905418
Assignee: BYK-CHEMIE GMBH
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A process for delamination of a layered silicate in an aqueous medium, the process comprising:
treating a layered silicate with an amount of a delamination agent, the amount of the delamination agent being at least equal to the cation exchange capacity of the layered silicate; and
contacting the treated layered silicate with an aqueous medium,
wherein the delamination agent
i. is a compound having exactly one positively charged atom, the positively charged atom being nitrogen or phosphorous;
ii. contains nf functional groups including any one or more of a hydroxyl group, an ether group, a sulfonic acid ester group, or a carboxylic acid ester group, nf being a number from 3 to 10;
iii. comprises a total number of carbon atoms nc being from 4 to 12;
iv. has a ratio nc/(1+nf) from 1 to 2, and
v. including any one or more of carbon, nitrogen, phosphorous, oxygen, or sulfur, nt being greater than or equal to 9

wherein the layered silicate is represented by general formula (I)

[MLc/valency]inter[MImMIIo]octa[MIII4]tetraX10Y2  (I)

wherein,
M represents metal cations of oxidation state 1 to 3;
MI represents metal cations of oxidation state 2 or 3;
MII represents metal cations of oxidation state 1 or 2;
MIII represents atoms of oxidation state 4;
X represents di-anions;
Y represents mono-anions;
m is less than or equal to 2.0 for metal atoms MI of oxidation state 3;
m is less than or equal to 3.0 for metal atoms MI of oxidation state 2; and
o is less than or equal to 1.0.