Trimodal molecular weight polyether polyol prepolymers

Details Trimodal molecular weight polyether polyol prepolymers Trimodal molecular weight polyether polyol prepolymers

C - Chemistry, Metallurgy

08

G

C08G 18/48 (2006.01) C08G 18/12 (2006.01) C08G 18/32 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2235592

A trimodal molecular weight toluene diisocyanate endcapped polyether polyol prepolymer is disclosed having free toluene diisocyanate below 0.5 weight percent where the three molecular weight polyols used are 300-800, 800 to 1500 and 1500-10000. Processes to make and use these prepolymers as polyurethane castable elastomers having exceptionally long flex fatigue lives using environmentally friendly materials essentially free of TDI are also disclosed.

L'invention porte sur un prépolymère de polyol de polyéther à extrémité coiffée de toluène di-isocyanate de poids moléculaire trimodal comportant du toluène di-isocyanate libre selon un pourcentage pondéral inférieur à 0,5, les polyols utilisés ayant trois poids moléculaires différents compris entre 300 et 800, 800 et 1500 et 1500 et 10 000. Cette invention a également trait à des procédés de production et d'utilisation de ces prépolymères en tant qu'élastomères de polyuréthanne coulables, d'une fatigue de souplesse exceptionnellement longue, faisant appel à des substances sans danger pour l'environnement, sensiblement exemptes de toluène di-isocyanate (TDI).

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