Polymeric mdi prepolymer compositions and flexible foams...

Details Polymeric mdi prepolymer compositions and flexible foams... Polymeric mdi prepolymer compositions and flexible foams...

C - Chemistry, Metallurgy

08

G

C08G 18/76 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08G 18/65 (2006.01)

Patent

CA 2232350

The present invention relates to prepolymers, comprising (a) a polymethylene polyphenylene polyisocyanate; and (b) a polyether polyol having an average hydroxyl equivalent weight of at least about 700; wherein the resulting prepolymer has an average viscosity of between about 400 to about 2000 centipoise at 25°C. The prepolymer is useful, for example, for the production of polyurethane foams and, more particularly, to medium density flexible foams having superior flow characteristic and fast demold times.

La présente invention concerne des prépolymères composés a) d'un polyméthylène- polyphénylène-polyisocyanate et b) d'un polyéther-polyol dont le poids équivalent moyen en hydroxyle est d'au moins 700; le prépolymère obtenu a une viscosité moyenne située entre environ 400 et environ 2 000 centipoises à 25 degrés Celsius. On peut par exemple utiliser ce prépolymère pour fabriquer les mousses de polyuréthane et, plus particulièrement, des mousses souples de polyuréthane souples de densité moyenne possédant d'excellentes caractéristiques de débit et dont le temps de démoulage est court.

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