One-pass method for preparing paper size emulsions
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorsMichel D. Létourneau, Walter Maliczyszyn
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Abstract
A one-pass, non-tolerance dependent method for preparing paper size emulsions comprising an aqueous emulsion of a substituted cyclic dicarboxylic anhydride, a colloidal stabilizer, and a surfactant wherein the emulsion after one-pass through a dispersion system has an average particle size of less than 2 microns.
Claims16
A one-pass method through a non-tolerance dependent dispersion system for preparing a paper size emulsion wherein the emulsion after one-pass through a dispersion system has an average particle size of less than 2 microns, said method comprising:
- (I) preparing raw materials which comprise at least one substituted cyclic dicarboxylic anhydride, at least one colloidal stabilizer, and water;
- (II) adding the raw materials prepared in Step (I) to a dispersion system comprising:
- a housing having a bottom chamber and an upper chamber wherein said housing has a means for cooling in contact therewith;
- a motor mounted to said housing for turning a shaft extending into said housing;
- a baffle plate mounted to said housing to separate said upper chamber from said lower chamber, said baffle plate having an aperture for receiving said shaft therethrough and forming an annular passage therebetween;
- at least two kinetic baffles mounted within said lower chamber to form pressure zones;
- an inlet cap mounted to said housing and having a primary inlet and a secondary inlet for delivering said plurality of materials into said lower chamber;
- and,
- at least two blades mounted to said shaft, at least one of said blades disposed in said lower chamber and at least one of said blades disposed in said upper chamber;
- and
- (III) emulsifying the raw materials in the dispersion system at a temperature of from about 40° F. to about 160° F. to form a paper size emulsion.
A one-pass method through a non-tolerance dependent dispersion system for preparing a paper size emulsion wherein 95% of the emulsion particles after one-pass through a dispersion system have a particle size of less than 2 microns, said method comprising:
- (I) preparing raw materials which comprise at least one substituted cyclic dicarboxylic anhydride, at least one colloidal stabilizer, and water;
- (II) adding the raw materials prepared in Step (I) to a dispersion system comprising:
- a housing having a bottom chamber and an upper chamber wherein said housing has a means for cooling in contact therewith;
- a motor mounted to said housing for turning a shaft extending into said housing;
- a baffle plate mounted to said housing to separate said upper chamber from said lower chamber, said baffle plate having an aperture for receiving said shaft therethrough and forming an annular passage therebetween;
- at least two kinetic baffles mounted within said lower chamber to form pressure zones;
- an inlet cap mounted to said housing and having a primary inlet and a secondary inlet for delivering said plurality of materials into said lower chamber;
- and,
- at least two blades mounted to said shaft, at least one of said blades disposed in said lower chamber and at least one of said blades disposed in said upper chamber;
- and
- (III) emulsifying the raw materials in the dispersion system at a temperature of from about 40° F. to about 160° F. to form a paper size emulsion.
Dependencies are inferred from the claim text.