Liquid isocyanurate group-containing polyisocyanate mixtures...

Details Liquid isocyanurate group-containing polyisocyanate mixtures... Liquid isocyanurate group-containing polyisocyanate mixtures...

C - Chemistry, Metallurgy

07

D

403/13, 402/160,

C07D 251/34 (2006.01) C08G 18/76 (2006.01) C08G 18/79 (2006.01)

Patent

CA 1227203

LIQUID ISOCYANURATE GROUP-CONTAINING POLYISOCYANATE MIXTURES OF 4,4'- AND 2,4'-DIPHENYLMETHANE DIISOCYANATE, METHOD FOR THEIR PREPARATION AND THEIR USE IN POLYURETHANE OR POLYISOCYANURATE PLASTICS Abstract of the Disclosure Isocyanurate group-containing polyisocyanate mixtures which are liquid at room temperature and which have an isocyanate group content of from 23 to 31 weight percent are obtained through the partial trimerization of a mixture comprised of from about 80 to about 30 percent by weight 4,4'-diphenylmethane diisocyanate and from about 20 to about 70 percent by weight 2,4'-diphenylmethane diisocyanate in the presence of a trimerization catalyst, preferably an adduct of tri(dimethylaminopropyl)-s-hexahydrotriazine, 1,2- propylene oxide, and 2-ethylhexanoic acid, and, in some cases, after chemical deactivation of the catalyst.

447165

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