Patent ID: 11905419
Assignee: BYK-CHEMIE GMBH
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A process for delamination of a synthetic or naturally occurring 2:1 clay mineral layered silicate in an aqueous medium, the process comprising:
treating a synthetic or naturally occurring 2:1 clay mineral layered silicate with a delamination agent, the layered silicate having a layer charge Lc greater than or equal to 0.25 and less than or equal to 1.0 and a charge equivalent area As of 47.6 Å2/(2 Lc),
contacting the treated layered silicate with an aqueous medium,
wherein the delamination agent
i. is an ionic compound having exactly one positively charged atom, the positively charged atom being nitrogen or phosphorous;
ii. contains of functional groups covalently bonded to the positively charged atom and including any one or more of a hydroxyl group, an ether group, a sulfonic acid ester group, or a carboxylic acid ester group, of being a number from 1 to 10;
iii. comprises a total number of carbon atoms nc being from 2 to 20;
iv. has a ratio nc/(1+nf) from 1 to 5; and
v. has a charge equivalent area Ad being from at least 0.90-fold to 2.00-fold 3 of the charge equivalent area of the layered silicate As; and wherein
the delamination agent is used to treat the layered silicate in an amount of at least equal to the cation exchange capacity of the layered silicate,
with the proviso that of is greater than or equal to 2, if Lc is less than or equal to 0.6.