Patent ID: 6251958
Filing Date: 2001-06-26
Classification: B01D,Y10S

Abstract:
The process of preparing a defoamer composition comprisinga. from about 75 to about 98 parts by weight of a functional carrier liquid,b. from 1 to about 15 parts by weight of a hydrophobic defoaming agent comprising an amide which is a reaction product of a polyamine having at least one alkylene group of 2 to 10 carbon atoms and a fatty acid of from 6 to 18 carbon atoms,c. from 0 to about 10 parts by weight of a base,d. from 0 to about 5 parts by weight of a reactive chlorosilane monomer, ande. from 0 to about 3 parts by weight of an organic component selected from the group consisting of an organic polymer, a fatty acid of 10 to 20 carbon atoms and a glyoeride of fatty acids of from 10 to 20 carbon atoms;comprising the steps of:A. providing a high-shear, in-line mixer having a rotor-stator assembly with at least one concentric set of shearing teeth which rotate at a tip speed of up to about 25 meters per second;B. melting component b. in a portion of component a.;C. adjusting the mixing speed of the rotor-stator assembly to a desired setting;D. feeding the resulting hot melt prepared in step B. into the rotor-stator assembly of said mixer at a controlled mass flow rate and temperature;E. simultaneously feeding the remaining portion of the component a. carrier liquid into the rotor-stator assembly of said mixer at a controlled mass flow rate and temperature;F. after obtaining the desired mixing of said melt from step B. and said carrier liquid, cooling the mixture to a desired temperature; andG. discharging said mixture from said mixer into a receiving vessel.