High impact poly(urethane urea) polysulfides

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/10 (2006.01) C08G 18/38 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2467191

The present invention relates to a sulfur-containing polyureaurethane and a method of preparing said polyureaurethane. In an embodiment, the sulfur- containing polyureaurethane when at least partially cured can have a refractive index of at least 1.57,an Abbe number of at least 35 and a density of less than 1.3 grams/cm3. Further, the sulfur-containing polyureaurethane can be prepared by reacting a polyureaurethane prepolymer comprising a polycyanate and at least one hydrogen-containing material, at least one episulfide-containing material; and an amine-containing curing agent.

L'invention concerne un poly-urée-uréthanne contenant du soufre, ainsi qu'un procédé de préparation de ce poly-urée-uréthanne. Dans un mode de réalisation de cette invention, ce poly-urée-uréthanne contenant du soufre, lorsqu'il est du moins partiellement durci, peut posséder un indice de réfraction d'au moins 1,57, un nombre d'Abbe d'au moins 35 et une densité inférieure à 1,3 grammes/cm?3¿. En outre, ce poly-urée-uréthanne contenant du soufre peut être préparé par mise en réaction d'un prépolymère de poly-urée-uréthanne comprenant un polycyanate et au moins un matériau contenant de l'hydrogène, au moins un matériau contenant de l'épisulfure, et un agent durcissant contenant de l'amine.

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