Blushed polystyrene pigment

Abstract

Abstract A NOVEL PROCESS IS DISCLOSED FOR CONVERTING A POLYSTYRENE OR POLYSTYRENE-ACRYLONTIRILE LATEX EMULSION INTO A NOVEL PRODUCT COMPRISING A WHITE, OPAQUE PIGMENT FOR USE AS A PAPER FILLER, A PAPER COATING PIGMENT, A PAINT PIGMENT, OR FOR ANY OTHER APPLICATION WHERE OPTICAL EFFECTS ARE DESIRED. THE PROCESS COMPRISES THE HIGH SHEAR MIXING OF A POLYSTYRENE-CONTAINING AQUEOUS EMULSION WITH A SWELLING AGENT WHICH PENETRATES THE POLYMER OR COPOLYMER PARTICLE THEREBY CAUSING IT TO SWELL, AND THEN A FINAL STEP FOR SETTING THE PARTICLE IN ITS SWOLLEN STATE. WHEN USING A PARTICALLY WATER MISCIBLE SWELLING AGENT, THE EMULSION MAY BE WASHED AND FILTERED TO REMOVE THE SWELLING AGENT FROM THE PARTICLE, THEREBY SETTING IT IN THE SWOLLEN STATE, BUT FOR AN ESSENTIALLY NON-WATER MISCIBLE SWELLING AGENT, THE EMULSION NEED ONLY BE FILTERED AND DRIED TO SET THE SWOLLEN PARTICLES, AND, WHERE REMOVAL OF THE SWELLING AGENT IS NOT NECESSARY, THE TREATED EMULSION MAY BE USED WITHOUT THE FILTERING OR DRYING STEPS.

Inventors

• 👤 H Kohne
• 👤 F Kurrle

Bibliographic Details