JPS6338370B

PURPOSE:To obtain titled prepolymer which has a long curing time and forms a hydrated gel having an extremely low foam content, by masking a urethane prepolymer having at least two free -NCO groups with a specified heterocyclic compound. CONSTITUTION:A urethane prepolymer having at least two free -N...

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Bibliographische Detailangaben
Hauptverfasser:	HIJIKATA KENJI, YOSHIMURA NAOKI, HOSOKAWA NORITAKA
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain titled prepolymer which has a long curing time and forms a hydrated gel having an extremely low foam content, by masking a urethane prepolymer having at least two free -NCO groups with a specified heterocyclic compound. CONSTITUTION:A urethane prepolymer having at least two free -NCO groups is obtained by reacting (i) a polyisocyanate such as 2,6-tolylene diisocyanate with (ii) a hydrophilic polyol such as an ethylene oxide addition polymer, MW 1,000- 20,000, in an eq. ratio, OH/NCO, of 0.5-1.0. Then, titled prepolymer is obtained by masking (A) the above urethane prepolymer with (B) a heterocyclic compound having a skeleton represented by the formula, such as imidazole or 2-methylimidazoline, in an eq. ratio, NH/NCO, of 0.2-2. USE:Grouting material, hydrated gel-forming material, paint.