Patent ID: 8044130

Claim:
Surface-coated flame-retardant particles comprising a flame-retardant grain and a coated layer provided on a surface of the flame-retardant grain, wherein the coated layer comprises an organic compound which has a binding group for combining with the flame-retardant grains at its terminal, or a polysilicone, the flame-retardant grain comprises a complex metal hydrate and has a volume average particle diameter of 1 to 500 nm, and the complex metal hydrate is represented by MgM x -(OH) y , wherein M represents one or more metals selected from the group consisting of Ca, Al, Fe, Zn, Ba, Cu, and Ni, x is a real number of 0.1 to 10, and y is an integer of 2 to 32; and wherein the surface-coated flame-retardant particles have a degree of dispersion from 0.1 to 3.0, the degree of dispersion being defined by the following Formula (1): Degree of dispersion=log( D 90 /D 10 ) where: in a plot of a mass weighted cumulative distribution of the particles against particle weight from the smaller particle diameter side, the particle diameter at which the cumulative distribution reaches the 90% point is designated as D 90 ; and the particle diameter at which the cumulative distribution reaches the 10% point is designated as D 10 .