Process for the manufacture of phosphorus-containing condensation products, the products and their use as flameproofing agents
US3932502A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1972 |
| Grant date | Jan 13, 1976 |
| Priority date | — |
| Expiry date | Aug 31, 1992 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/268
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The subject of the invention is a process for the manufacture of water-soluble condensation products of hydroxymethylphosphonium compounds and thiourea or biuret, characterised in that (a) one mol of a tetrakis-(hydroxymethyl)-phosphonium compound is condensed with (b) 0.02 to 0.5 mol, preferably 0.1 to 0.3 mol, of optionally methylolated thiourea or biuret at 40.degree. to 120.degree.C, optionally in the presence of formaldehyde or a formaldehyde-releasing agent and optionally in the presence of an inert organic solvent, the condensation is optionally thereafter continued at temperatures of 100.degree. to 150.degree.C and, if appropriate, free hydroxyl groups are etherified at least partially with at least one alkanol with 1 to 4 carbon atoms and, if appropriate, the salts of the condensation products are converted into the corresponding hydroxides. In addition to the preferred molar ratio range of 1:0.1 to 0.3, the range of 0.2 to 0.5 is also advantageous. The condensation products are used for flameproofing organic fibre material, especially textiles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.