Storage-stable melamine dispersion
US5125952A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1987 |
| Grant date | Jun 30, 1992 |
| Priority date | — |
| Expiry date | Aug 6, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S71/904
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A storage-stable dispersion providing melamine in the form of a concentrated liquid for effective use as an end product or as an ingredient for conversion into other products. The dispersion contains melamine particles finer than about 50 microns in diameter, admixed with a chemically inert suspending liquid, having a specific gravity between 0.9 and 1.3 grams per milliliter, containing between 0.03 and 0.20 percent of a chemically inert thickening agent, which interacts physically with the suspending liquid to increase viscosity to between 250 and 3000 centipoise, thereby substantially maintaining the melamine particles in a stable dispersion and preventing their settling. The dispersion composition is an effective form of melamine for accurate dispensing as an agricultural, pulp and paper, or fire-retardant ingredient. Effective thickening agents include xanthan gums, carrageenans, polyacrylamide, chemically treated cellulose, and clays. Nonionic surfactants are helpful in wetting the melamine particles with the suspending liquid. The suspending liquid may be water, aqueous solutions, hydrophilic organic polyols, and high molecular weight organic liquid polyols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.