[DE] VERFAHREN ZUR HERSTELLUNG VON (CYCLO)ALIPHATISCHEN ISOCYANATEN<br/>[EN] METHOD FOR PRODUCING (CYCLO)ALIPHATIC ISOCYANATES<br/>[FR] PROCEDE DE PRODUCTION D'ISOCYANATES (CYCLO)ALIPHATIQUES
申请人:BASF AG
公开号:WO2004056760A1
公开(公告)日:2004-07-08
Verfahren zur Herstellung von (cyclo)aliphatischen Isocyanaten durch Umsetzung von primären (cyclo)aliphatischen Aminen mit Phosgen in der flüssigen Phase in einem organischen Lösungsmittel und Vorrichtungen zur Durchführung dieses Verfahrens.
2-Amino-4-methylthiazol-3-oxide 5 is reacted with isocyanates and with acid chlorides. Aliphatic isocyanates attack the 5-position aromatic isocyanates, however, attack the N-oxide-oxygen of the heterocyclic ring. Acid chlorides react with 5 giving reactive N-acylammonium salts which can be isomerisized by bases. As with isocyanates differences of the individual acid chlorides can be observed: with
The invention relates to novel silane-modified formamide-polymers and/or pre-polymers for bonding and/or sealing diverse substrate materials, such as, for example metal, wood, glass and/or plastic. The invention also relates to a reactive single-component adhesive system comprising the claimed silane-modified formamide polymers.
The present invention relates to a multiple-stage process for the continuous preparation of organic, distillable polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic poly-amines with ureas to form low-molecular monomeric polyureas, and the thermal decomposition thereof.
The invention provides a multistage process for continuously preparing organic polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic polyamines with carbonic acid derivatives and alcohols into monomeric polyurethanes of low molecular mass, and the dissociation of said polyurethanes. The invention further provides an associated preparation process in which at certain reaction stages the polyisocyanates prepared and unutilizable residues are removed and reusable by-products and intermediates are recycled to preliminary stages.