Process for the preparation of polyurethane resins and their...

Details Process for the preparation of polyurethane resins and their... Process for the preparation of polyurethane resins and their...

C - Chemistry, Metallurgy

08

G

C08G 18/08 (2006.01) B05D 1/36 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2163544

The present invention relates to a process for the preparation of polyurethane resins, in which, in an ester as solvent, a) at least one compound having 2 hydroxyl and/or amino groups, b) at least one di- and/or polyisocyanate, c) at least one compound containing 2 groups which are reactive toward isocyanate groups, these compounds containing, at least in part, at least one group capable of forming anions which is neutralized before or after incorporation of component (c) into the polyurethane molecule, and d) at least one compound having at least 3 hydroxyl and/or amino groups are used to prepare a polyurethane resin, preferably using components (a), (b) and (c) to prepare an intermediate which has terminal isocyanate groups and - 38 - at least some of whose free isocyanate groups are subsequently reacted with component (d), characterized in that ethoxyethyl propionate is employed as solvent.

L'invention concerne un procédé de production de résines polyuréthanne selon lequel on produit une résine polyuréthanne dans un ester utilisé comme solvant et comprenant: a) au moins un composé ayant deux groupes hydroxy et/ou amino, b) au moins un di- et/ou un polyisocyanate, c) au moins un composé contenant deux groupes réagissant avec des groupes isocyanate, une partie au moins de ce composé présentant au moins un groupe apte à former un anion et qui est neutralisé avant ou après l'incorporation du constituant (c) dans la molécule de polyuréthanne, et d) au moins un composé comportant au moins trois groupes hydroxy et/ou amino. Un produit intermédiaire contenant des groupes isocyanate en fin chaîne est produit de préférence à partir des constituants (a), (b) et (c), puis on fait réagir les groupes isocyanate libres de ce produit intermédiaire, au moins en partie, avec le constituant (d). Ce procédé se caractérise en ce qu'on utilise, comme solvant, du propionate d'éthoxyéthyle.

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