Polyurethane moulding compsn. suitable for RIM

Polyurethane moulding compsn. (I) has polyisocyanate (II) and polyol (III) components. (III) comprises: (i) 0.5-0.85 pts.wt. propylene glycol and 0.5-0.15 pts.wt. dipropylene glycol; and (ii) oligomeric polyol of av. mol.wt. 3000-10,000. The wt. ratio of (i) to (ii) is 2:1-1:1 and (II) provides isoc...

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1. Verfasser:	TUFTS TIMOTHY A
Format:	Patent
Sprache:	eng ; ita
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Zusammenfassung:	Polyurethane moulding compsn. (I) has polyisocyanate (II) and polyol (III) components. (III) comprises: (i) 0.5-0.85 pts.wt. propylene glycol and 0.5-0.15 pts.wt. dipropylene glycol; and (ii) oligomeric polyol of av. mol.wt. 3000-10,000. The wt. ratio of (i) to (ii) is 2:1-1:1 and (II) provides isocyanate equiv. index of 1.1-1.6. Pref. (II) is (liquefied) MDI and/or its polymeric analogue. The oligomeric polyol is a hydroxy terminated polybutadiene or butadiene-acrylonitrile copolymer, polyester polyol pref. polyester diol, or a polyoxyalkylene polyol or polymer/polyoxyalkylene polyol dispersion the polymer of this dispersion being polyacrylonitrile or acrylonitrile-styrene copolymer.