Patent ID: 6676743
Filing Date: 2004-01-13
Classification: C04B,Y02W

Abstract:
A lightweight clay comprising:organic hollow micro spheres; and binder resin; and an average particle size of the organic hollow micro spheres is set to a value, which falls within a range of 15 to 150 &mgr;m; an amount of the organic hollow micro spheres is set to a value which falls within a range of 0.1 to less than 3 weight % with respect to a total quantity of the lightweight clay, when a density of constituent materials other than the organic hollow micro sphere is less than 0.5 to 0.8 g/cm3, and is set to a value which falls within a range of 0.1 to 6 weight % with respect to a total amount of the lightweight clay, when a density of constituent materials other than the organic hollow micro sphere is 0.8 to 5 g/cm3; and the whiteness degree (WL) of the lightweight clay measured in accordance with JIS L 0803 is set to a valu not less them 70.