Patent ID: 6288174
Filing Date: 2001-09-11
Classification: C04B,C08F,C08J

Abstract:
An acrylic polymer powdery material comprising fine particles of a core-shell structure formed of: (i) a core polymer containing an acrylic polymer having a glass transition temperature (Tg) of -20-+15.degree. C., a weight average molecular weight of 100000-2000000, an acid value of 25 mg KOH/g or less; and (ii) a shell polymer containing an acrylic polymer having a Tg of 50-90.degree. C., a weight average molecular weight of 100000-2000000, an acid value of 30-130 mg KOH/g, wherein the weight ratio of the core polymer of the shell polymer is 30/70-80/20 (% by weight), the powdery material being free-flowing and devoid of any secondary aggregated powder crumbs of 1 mm or greater in diameter.