Color containing silica resistant to dye migration and method of

Details Color containing silica resistant to dye migration and method of Color containing silica resistant to dye migration and method of

1999-05-18

2000-11-07

Rose, Shep K.

Drug, bio-affecting and body treating compositions

Dentifrices

424417, 424724, 514770, 51308, 433435, 433439, 106482, 8523, A61K 716, A61K 4700, C04B 1404, C07B 1404

Patent

active

061432806

ABSTRACT:
There is provided a method of adhering dye to a silica. The method comprises providing a silica slurry which includes a plurality of silica particles, depositing alum in the pores of the silica particles, reacting a base with the alum to convert the alum into aluminum hydroxide resulting in treated silica particles. The treated silica particles are then filtered and washed. Thereafter, a dye is mixed with the treated silica particles. The resultant dyed silica product is resistant to dye migration.

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