Claims
- 1. Amorphous silica having:an RDA value of between 40 and 70; a light transmission of more than 70% at a refractive index of below 1.445; an oil absorption capacity of between 90 and 145 cm3/100 g; a structural water content of between 3.5% and 5.0%, and a BET surface area of between 50 and 250 m2/g.
- 2. Amorphous silica according to claim 1 wherein said refractive index is between 1.430 to 1.444.
- 3. The amorphous silica according to claim 1 wherein said refractive index is between 1.436 and 1.444.
- 4. The amorphous silica according to claim 1 wherein said RDA value is between 50 and 60.
- 5. The amorphous silica according to claim 1 wherein said oil absorption capacity is between 100 and 125 cm3/100 g.
- 6. Amorphous silica having:an RDA value of between 40 and 70; a light transmission of more than 70% at a refractive index of below 1.445; an oil absorption capacity of between 90 and 145 cm3/100 g; a structural water content of between 3.5% and 5.0%, and a BET surface area of between 50 and 250 m2/g; a pH in a 5% solution of between 6 and 7.5; and a loose bulk density of between 180 and 300 g/l.
- 7. The amorphous silica according to claim 6 wherein said refractive index is between 1.430 to 1.444.
- 8. The amorphous silica according to claim 6 wherein said refractive index is between 1.436 and 1.444.
- 9. The amorphous silica according to claim 6 wherein said RDA value is between 50 and 60.
- 10. The amorphous silica according to claim 1 wherein said oil absorption capacity is between 100 and 125 cm3/100 g.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9601084 |
Jan 1996 |
GB |
|
Parent Case Info
This is a continuation of application Ser. No. 08/786,036, filed Jan. 21, 1997 now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
5225177 |
Wason et al. |
Jul 1993 |
A |
5676932 |
Wason et al. |
Oct 1997 |
A |
5964937 |
Stanier |
Oct 1999 |
A |
Foreign Referenced Citations (5)
Number |
Date |
Country |
227334 |
Jul 1987 |
EP |
0 535 943 |
Apr 1993 |
EP |
2 146 317 |
Sep 1984 |
GB |
WO 9202454 |
Feb 1992 |
WO |
WO 9410087 |
May 1994 |
WO |
Continuations (1)
|
Number |
Date |
Country |
Parent |
08/786036 |
Jan 1997 |
US |
Child |
09/395769 |
|
US |