| Patent Number |
Title Of Patent |
Date Issued |
| 5599968 |
Continuous process for the preparation of organic isocyanates |
February 4, 1997 |
| Organic isocyanates are continuously prepared by reacting primary organic amines with phosgene in the presence of an inert, organic solvent, with the reaction mixture being circulated by means of a bubble column at a temperature of from 60.degree. to 100.degree. C. and with the ratio of |
| 5468783 |
Modified aromatic polyisocyanates and their use for the production of rigid foamed materials |
November 21, 1995 |
| Polyaromatic polyisocyanates are modified by reaction with 0.1 to 10 weight %, preferably 2 to 7 weight % (based on polyisocyanate) of a polyether alcohol of molecular weight 206 to 948, obtainable by the reaction of alkylene oxides with C.sub.6 -C.sub.30, preferably C.sub.8 -C.sub.20, |
| 5449818 |
Process for the preparation of aromatic diisocyanates |
September 12, 1995 |
| A continuous process for the preparation of aromatic diisocyanates by phosgenation of the corresponding diamines, in which the reaction is carried out in the gas phase. The mean contact time for the gaseous reactants is from 0.5 to 5 seconds with a mean deviation of no more than 6%. |
| 5424386 |
Modified aromatic polyisocyanates and their use for the production of rigid foamed materials |
June 13, 1995 |
| Polyaromatic polyisocyanates are modified by reaction with 0.1 to 10 weight %, preferably 2 to 7 weight % (based on polyisocyanate) of a polyether alcohol of molecular weight 206 to 948, obtainable by the reaction of alkylene oxides with C.sub.6 -C.sub.30, preferably C.sub.8 -C.sub.20, |
| 5314588 |
Process for recovering polysocyanates from the distillation residues obtained in the production |
May 24, 1994 |
| A process for recovering a distillate of tolylene diisocyanate and an isocyanate-group-containing sump product containing less than 200 ppm (by weight) tolylene diisocyanate from A) distillation residues obtained in the production of tolylene diisocyanate by mixing of the distillation |
| 5310769 |
Process for the production of polyamine mixtures of the polyamino-polyaryl-polymethylene series |
May 10, 1994 |
| A process for production of polyamines of the diphenylmethane series through a condensation reaction of aniline with formaldehyde in the presence of an acid catalyst, neutralization of the acid catalyst after reaction completion, and distillation of the resultant polyamine mixture is |
| 5175349 |
Stabilization of organic polyisocyanates |
December 29, 1992 |
| The present invention relates to the use of nucleus-substituted 4-hydroxyphenyl propionic acid compounds for stabilizing organic polyisocyanates. |
| 4564513 |
Process for the production of carbon monoxide |
January 14, 1986 |
| Carbon monoxide is produced in an improved process in a carbon-filled, water-cooled generator in the configuration of a truncated cone in the longitudinal section, by the gasification of said carbon with a mixed gas of oxygen and carbon dioxide, wherein the improvement comprises injectin |
