| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sustained release perfume carrier which is easily manufactured at a low cost, can widely select the type of the perfume component carried and its molecular size, can carry a large amount of the perfume component, is high in purity to reduce averse effects upon the perfume component, and additionally excels in water resistance, heat resistance, long-term property stability and the like. <P>SOLUTION: The sustained release perfume carrier has a silica gel meeting the properties such that (a) the pore volume is 0.05 ml/g to 3.0 ml/g; (b) the specific surface area is 100 m<SP>2</SP>/g to 1,500 m<SP>2</SP>/g; (c) the highest-frequency diameter (D<SB>max</SB>) of pores is less than 35 nm; (d) the total volume of pores having a diameter in the range of D<SB>max</SB>±20% is ≥50 % total volume of the total pores; (e) the silica gel is amorphous; (f) the total content of metal impurities is ≤500 ppm; and (g) when the chemical shift of the Q<SP>4</SP>peak in the solid Si-NMR is taken as δ (ppm), δ meets formula (I): -0.0705×(D<SB>max</SB>)-110.36>δ. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
