C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/76 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01)
Patent
CA 2516024
The present invention relates an MDI-based isocyanate-terminated prepolymer suitable for preparing a hydrophilic polyurethane polymer. The MDI-based composition comprises a prepolymer obtained by reacting isocyanate mixture comprising 2,4'-methylene diphenylisocyanate (MDI) and 4,4'-methylene diphenylisocyanate in a molar ratio of from 25:75 to 80:20 with a polyether polyol having an oxyethylene content of at least 30 percent by weight.
L'invention concerne un prépolymère à base de MDI et à terminaison isocyanate apte à la préparation d'un polymère polyuréthanne hydrophile. La composition à base de MDI comprend un prépolymère obtenu en faisant réagir un mélange isocyanate contenant du 2,4'-méthylène diphénylisocyanate (MDI) et du 4,4'-méthylène diphénylisocyanate dans un rapport molaire allant de 25:75 à 80:20 avec un polyéther polyol dont la teneur minimale en oxyéthylène est de 30 % en poids.
Lopez Netza B.
Parks Franklin E.
Pellacani Luigi
Thiede Verena M.t.
Dow Global Technologies Inc.
Dow Global Technologies Llc
Smart & Biggar
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