Patent ID: 6663948
Filing Date: 2003-12-16
Classification: C08K,Y10T

Abstract:
An additive for synthetic resins which comprises composite particles (MR) which are obtained by depositing a calcium phosphate compound (R) on support particles (M) having a petaloid porous structure, the composite particles satisfying the following formulas (a)-(h);(a) 0.1&lE;Dmr&lE;20 (&mgr;m) (b) 1&lE;Dmr/Dm&lE;5 (c) 0.5&lE;Tmr1&lE;5 (% by weight) (d) 0.01&lE;Tmr1/Tm1<1 (e) 0.3&lE;Tmr2&lE;3 (% by weight) (f) 0.01&lE;Tmr2/Tm2<1 (g) 1&lE;&agr;mr&lE;5, where &agr;+dmr50/Dmr (h) 0&lE;&bgr;mr&lE;2, where &bgr;=(dmr90âˆ’dmr10)/dmr50 wherein,Dmr: Average particle diameter (&mgr;m) of the composite particles (MR) measured by a photograph of a scanning electron microscope (SEM); Dm: Average particle diameter (&mgr;m) of the support particles (M) measured by a photograph of a scanning electron microscope (SEM); Tmr1: Heating loss (% by weight) at 500Â° C. of the composite particles (MR); Tm1: Heating loss (% by weight) at 500Â° C. of the support particles (M); Tmr2: Heating loss (% by weight) at 200Â° C. of the composite particles (MR); Tm2: Heating loss (% by weight) at 200Â° C. of the support particles (M); &agr;mr: Dispersion coefficient of the composite particles (MR); dm50: 50% average particle diameter (&mgr;m) of the support-particles (M) measured by a particle size distribution tester using a microtrack FRA laser; dmr50: 50% average particle diameter (&mgr;m) of the composite particles (MR) measured by a particle size distribution tester using a microtrack FRA laser; &bgr;mr: Sharpness of the composite particles; dm90: 90% particle diameter of the total support particles (M) passed through a sieve measured by a particle size distribution tester using a microtrack FRA laser; dmr90: 90% particle diameter of the total composite particles (MR) passed through a sieve measured by a particle size distribution tester using a microtrack FRA laser; dm10: 10% particle diameter of the total support particles (M) passed through a sieve measured by a particle size distribution tester using a microtrack FRA laser; dmr10: 10% particle diameter of the total composite particles (MR) passed through a sieve measured by a particle size distribution tester using a microtrack FRA laser.