Non-toxic stabilizing agent for aqueous suspensions of sodium silico-aluminates
US5216100A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1991 |
| Grant date | Jun 1, 1993 |
| Priority date | — |
| Expiry date | Dec 6, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K23/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Copolymers for stabilizing aqueous suspensions of sodium silico-aluminates or zeolites, which are crosslinked, soluble in water, at least at pH 7 or above, and consist essentially of: PA0 a) at least one non-crosslinking acrylic monomer having a carboxylic function, chosen from among acrylic and methacrylic acids, PA0 b) possibly at least one non-crosslinking acrylic monomer chosen from among the esters, amides and/or nitriles of acrylic and/or methacrylic acids, PA0 (c) at least one crosslinking monomer having at least two acrylic and/or allyl and/or vinyl double bonds, PA0 (d) possibly, at least one at least bifunctional crosslinking monomer comprising at most one double bond and at least one other chemical function that is reactive with regard to the other monomers with acid, amide or nitrile functions of the monomers of types (a) and (b), PA0 the total amount of the crosslinking monomers of types (c) and (d) constituting from 1 to 5, preferably from 1 to 4 weight percent based on the total weight of the monomers, when used in a ratio of at most 0.4% by weight of dry substances in relation to the total mass of the suspension, are effective for preparing stable suspensions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.