Powdery material and modifier for cementitious material
AssigneeMitsubishi Rayon Co., Ltd.
InventorsYukihiro Ikegami, Toshihiro Kasai
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Abstract
An acrylic polymer powdery material, which is a particularly useful powdery material as a modifier for cementitious material, comprising fine particles of a core-shell structure comprising a core polymer being comprised of an acrylic polymer having a glass transition temperature (Tg) of −20-+15° C., a weight average molecular weight of 100000-2000000, an acid value of 25 mg KOH/g or less and a shell polymer being comprised of an acrylic polymer having a Tg of 50-90° 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 and shell polymer is 30/70-80/20 (% by weight).
Claims16
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° 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° 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.
Dependencies are inferred from the claim text.