Patent ID: 9555419
Date: 2017-01-31
CPC Classifications: B03B,B03D,B65D,C08J,C08K,C09D,Y10T

Claim:
1. A process for separating two materials having a density of greater than 1000 kg/m 3 at standard temperature and pressure using a sink-float method, the process comprising: (a) depositing at least one ink or coating composition comprising at least one chemical blowing agent on one of the two materials, in an amount sufficient to make the one material float in an aqueous separation liquid when the chemical blowing agent is activated; (b) contacting the two materials with the aqueous separation liquid at conditions effective to activate the chemical blowing agent to cause foaming to occur; (c) allowing the one material with the ink or coating composition to float to the surface of the aqueous separation liquid and the other material to sink; and (d) collecting the one material with the ink or coating composition from the surface of the aqueous separation liquid, or the other material from the bottom of the aqueous separation liquid, or both.