| 摘要 |
PARTICLE IN THE SHAPE OF AN ENCAPSULATED DROPLET COMPRISING A CORE MATERIAL AND A SHELL MATERIAL SURROUNDING THE CORE MATERIAL, THE SHELL MATERIAL CONTAINING MALEIMIDE GROUPS, PREFERABLY A COPOLYMER OF MALEIMIDE GROUPS. THE SHELL MATERIAL CONTAINS A COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE DERIVATIVES, OF WHICH MORE THAN 75 MOLE %, PREFERABLY MORE THAN 90 MOLE % IS MALEIMIDE, AND THE AVERAGE PARTICLE SIZE IS SMALLER THAN 300NM. THE PARTICLES ARE OBTAINED BY A PROCESS COMPRISING BY HEATING BETWEEN 80°C AND 195°C, MORE PREFERABLY BETWEEN 120°C AND 190°C AN AMMONIUM SALT OF A MALEIC ANHYDRIDE CONTAINING POLYMER IN THE PRESENCE OF THE CORE MATERIAL. |
