POLYISOCYANATE MIXTURE WHICH IS LIQUID AT TEMPERATURE HIGHER THAN 5 ×C

Polyisocyanate mixts. (I) based on 4,4'-MDI, which are liq. at temps. above 5 degrees C, have (A) a NCO content of 14.5-24 wt.% and (B) an allophanate gp. content of 7.7-14.5 wt.% (calculated as C2HN2O3; mol. wt. = 101). Also claimed is a process for the prodn. of (I) by reacting 4,4'-MDI...

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Bibliographische Detailangaben
Hauptverfasser:	YOOZEFU PEDAIN, RUTSUTSU SHIYUMARUSUTEIIKU, HARARUDO MERUTESU
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON CORRECTING FLUIDS DYES FILLING PASTES INKS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	Polyisocyanate mixts. (I) based on 4,4'-MDI, which are liq. at temps. above 5 degrees C, have (A) a NCO content of 14.5-24 wt.% and (B) an allophanate gp. content of 7.7-14.5 wt.% (calculated as C2HN2O3; mol. wt. = 101). Also claimed is a process for the prodn. of (I) by reacting 4,4'-MDI with 4-16C monohydric alcohols at up to 160 degrees C, with a NCO/OH equiv. ratio of (5:1)-(8.5:1), in the presence of a catalyst for allophanate prodn. (II) which is added at the latest after formation of the intermediate urethane.