The effect of sulphur dioxide on the mannich reactions of phenols
作者:Robin A. Fairhurst、Harry Heaney、George Papageorgiou、Robert F. Wilkins
DOI:10.1016/s0040-4039(00)82196-6
日期:1988.1
Regioselectivity in the -dialkylaminomethylation of phenols is greatest, for example in reactions of 2,5-dimethylphenol, when a mixture of the phenol and sulphurdioxide is allowed to stand for several hours before the addition of a bis-(dialkylamino)methane (aminal) or an alkoxydialkylaminomethane (aminol ether).
[DE] VERFAHREN ZUR KONTINUIERLICHEN SYNTHESE VON METHYLAMINEN<br/>[EN] METHOD FOR THE CONTINUOUS SYNTHESIS OF METHYLAMINES<br/>[FR] PROCEDE POUR REALISER LA SYNTHESE CONTINUE DE METHYLAMINES
申请人:BASF AG
公开号:WO2005123658A1
公开(公告)日:2005-12-29
Verfahren zur kontinuierlichen Synthese von Methylaminen durch Umsetzung von Methanol und/oder Dimethylether mit Ammoniak in Gegenwart eines Heterogenkatalysators, dadurch gekennzeichnet, dass als Katalysator ein Formkörper enthaltend ein mikroporöses Material und mindestens eine siliziumorganische Verbindung als Bindemittel, herstellbar durch ein Verfahren umfassend die Schritte, (I) Herstellen eines Gemischs, enthaltend das mikroporöse Material, das Bindemittel, ein Anteigmittel und ein Lösungsmittel, (II) Vermischen und Verdichten des Gemischs, (III) Verformen des verdichteten Gemischs unter Erhalt eines Formkörpers, (IV) Trocknen des Formkörpers und (V) Calcinieren des getrockneten Formkörpers eingesetzt wird.
A toughened ambient temperature cure epoxy adhesive resin having excellent adhesion to metals, polyurethane, and fibre-reinforced polyesters contains polyepichlorohydrin in the resin components. The cured composition has good sandibility, flexibility and toughness superior to conventional epoxies.
A cured phenolic resin may be prepared by reacting (1) an esterified phenolic compound containing one or more phenolic hydroxyl groups and/or one or more esterified phenolic hydroxyl groups and further containing one or more esterified methylol groups ortho and/or para to the (esterified) phenolic hydroxyl group and (2) a phenolic resole resin in the presence of a base and water and/or other polar solvent. This technique may be used in the production of phenolic-based adhesives, foundry moulding compositions, surface coatings, foams and proppants.
Polyurethane foams manufactured with mixed gas/liquid blowing agents
申请人:THE DOW CHEMICAL COMPANY
(a Delaware corporation)
公开号:EP0400443A2
公开(公告)日:1990-12-05
Disclosed are mixed halocarbon blowing agents comprising (1) halocarbons boiling below 10°C, (2) halocarbons boiling between 20°C and 35°C, and (3) inert organic liquids having a boiling point of from 35°C to 125°C.
Also disclosed are blends of the above mixed blowing agents with active hydrogen-containing compounds, particularly polyols and the rigid closed cell foams prepared from such blends.
Up to 60 percent reduction in hard halocarbons is realized with the mixed blowing agents.