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Turbidity-free polyoxyethylene-terminated polyol blend of multi-dispersed polyol polyurethane elastomer isocyanate microcellular elastomer terminated in turbidity-free prepolymer
Turbidity-free polyoxyethylene-terminated polyol blend of multi-dispersed polyol polyurethane elastomer isocyanate microcellular elastomer terminated in turbidity-free prepolymer
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机译:无浊预聚物封端的多分散多元醇聚氨酯弹性体异氰酸酯微孔弹性体的无浊聚氧乙烯封端多元醇混合物
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摘要
Polyurethane elastomers exhibiting improved green strength while maintaining short demold times are prepared from ultra-low unsaturation polyoxypropylene polyols containing up to 20 weight percent internal random oxyethylene moieties. The elastomers adsorb less than 10 weight percent water at 0 DEG C. The internal polyoxyethylene moiety-containing polyoxypropylene polyols may be used to prepare ultra-low unsaturation polyoxyethylene capped polyols which are haze-free and which may be used to prepare haze-free 4,4'-MDI prepolymers. Multidisperse blends of monodisperse internal oxyethylene moiety-containing polyoxypropylene polyols of ultra-low unsaturation provide yet further improvements in elastomer processing.
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