Method of preparing microcapsules

Abstract

Abstract A MICROENCAPSULATION PROCESS IS DISCLOSED USING A MIXTURE OF SOLUTIONS OF POLYMER MATERIALS USEFUL OVER A WIDE PH RANGE WHICH INCLUDES BRINGING CORE PARTICLES, EITHER OF A WATER-IMMISIBLE LIQUID OR PARTICULATE SOLID, INTO CONTACT WITH AN AQUEOUS SOLUTION OF GELATIN AND POLYVINYL ALCOHOL, OR THEIR WATER SOLUBLE DERIVATIVES, CAUSING THE GELATING COMPOUND TO UNDERGO PHASE SEPARATION FORMING AN ENCAPSULATING SHELL COMPOSED PRIMARILY OF THE GELATING COMPONENT IS FOMED AROUND THE INDIVIDUAL CORE PARTICLES, THEN LOWERING THE TEMPERATURE OF THE MIXTURE TO CAUSE THE GELATIN COMPONENT THAT SURROUNDS THE INDIVIDUAL CORE PARTICLES TO GEL. SUBSTANTIALLY UNIFORM NONAGGLOMERATED MICROCAPSULES SO FORMED ARE USEFUL AS SURFACE COATINGS ON A SUBSTRATE MATERIAL SUCH AS A PRESSURE SENSITIVE RECORDING PAPER.

Inventors

• 👤 T Shiozaki
• 👤 J Kono

Bibliographic Details