Isocyanic compositions and use thereof in the preparation of...

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C - Chemistry, Metallurgy

08

G

C08G 18/76 (2006.01) C08G 18/12 (2006.01) C08G 18/38 (2006.01) C08G 18/78 (2006.01) C08K 3/00 (2006.01) C08K 5/521 (2006.01) C08K 5/5333 (2006.01)

Patent

CA 2432054

An isocyanic composition having an isocyanic functionality of between (15)% and (40)% and containing (5) to (75)% by weight of toluene diisocyanate optionally modified with a polyether polyol, (0) to (30)% by weight of diphenylmethane diisocyanate with a (4),(4)' to isomer content of greater than (40)% by weight, (10) to (70)% by weight of 2,4-toluene diisocyanate, (10) to (30)% by weight of MDI polymer of general formula (I): in which .PHI. represents a phenyl group and n is an integer greater than or equal to (1); and (5) to (30)% by weight of a phosphorus-based flame-retardant additive.

L'invention concerne une composition isocyanique poss~dant une fonctionnalit~ isocyanique allant de 15 % ~ 40 % et contenant de 5 ~ 75 % en poids de tolu­ne diisocyanate ~ventuellement modifi~ ~ l'aide d'un polyol de poly~ther, de 0 ~ 30 % en poids de diisocyanate de diph~nylm~thane avec un contenu isom~rique 4,4' sup~rieur ~ 40 % en poids, de 10 ~ 70 % en poids de 2,4-tolu­ne diisocyanate, de 10 ~ 30 % en poids d'un polym­re MDI repr~sent~ par la formule g~n~rale (I) dans laquelle .PHI. repr~sente un groupe ph~nyle et n est un nombre entier sup~rieur ou ~gal ~ 1, et de 5 ~ 30 % en poids d'un additif ~ base de phosphore ignifuge.

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