Finely comminuted water-soluble materials and aqueous suspensions thereof
US4367104A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1980 |
| Grant date | Jan 4, 1983 |
| Priority date | — |
| Expiry date | Aug 26, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC06B47/14
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Water-soluble crystalline material which has been comminuted in a saturated aqueous solution of the material in the presence of a water-soluble crystal-growth inhibitor having a hydrophobic portion and a hydrophilic portion in its molecular structure is mixed with a deflocculant which inhibits the interaction of the hydrophobic molecular portions whenever the comminuted solid is suspended in water. The viscosity of aqueous suspensions of comminuted solid is thereby stabilized. The invention is especially beneficial in the preparation of aqueous suspensions of finely comminuted ammonium nitrate for use in slurry blasting explosives. With crystal-growth inhibitors such as water-soluble polysaccharide derivatives, long chain aliphatic amines, polyacrylic acids, sulphonated nuclear aromatic compounds, sulphonated dyes or sulphonated polymers the preferred deflocculant, which should be different from the crystal-growth inhibitor, may include water-soluble polysaccharide derivatives, polyacrylic acid, polyvinyl pyrrolidone, sodium lignosulphonate and/or a salt of a condensate of naphthalene sulphonic acid with formaldehyde.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.