Method for preparing hollow silica particles
US6221326A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1998 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Oct 20, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K7/26
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method for preparing hollow particles comprising a dense silica shell, by precipitating active silica from an aqueous alkaline metal silicate on a core constituted in a material other than silica and by eliminating the material without destroying the silica shell. The particles are used as insulating materials; as hollow fillers for polymers, building materials, rubber, paper, paint; as absorbing agents; as toothpaste abrasives or additives; as support for the absorption and/or graining out active matter, the liberation of the active matter being effected by the destruction of the silica core by mechanical rupture or by dissolving the silica shell in a basic medium or by diffusion; as sun screening agents or sun screening agent supports or for the formulation of liquid matter in solid form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.