Primer composition for improving the bonding of a urethane...

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 11/06 (2006.01) C09D 133/06 (2006.01) C09D 183/08 (2006.01) C09D 183/14 (2006.01) C09J 5/02 (2006.01) C09J 201/00 (2006.01)

Patent

CA 2163445

Described herein is a primer composition which comprises a solution or dispersion of: (a) 2 percent to 30 percent by weight of a film-forming resin; (b) 2 percent to 80 percent by weight of a reaction product of an epoxy silane and an amino silane, wherein the amino silane contains at least two amine groups per molecule, which is prepared by (1) contacting an amino silane and epoxy silane in amounts such that the molar ratio of epoxy silane to amino silane in the reaction mixture is less than 1.8:1.0 and then (2) adding additional epoxy silane to the reaction mixture so that the molar ratio of epoxy silane to amino silane is at least 2:1 in a volatile solvent. It has been discovered that the primer of the invention enhances the bonding of a non-porous substrate, such as glass, to a second substrate, particularly when used in conjunction with a "fast cure" adhesive comprised of an isocyanate-functional prepolymer and dimorpholinodiethyl ether. In addition, such primers are more easily prepared than primers which require the use of a silane "cook" comprising a reaction product of a polyisocyanate and one or more silane-containing compounds.

L'invention concerne une composition d'amorce qui comprend une solution ou une dispersion de: (a) 2 % à 30 % en poids d'une résine filmogène; (b) 2 % à 80 % en poids d'un produit de réaction d'unépoxy silane et d'un amino silane. L'amino silane contient au moins deux groupes d'amines par molécule, et on le prépare (1) en mettant en contact un amino silane et un époxy silane dans des quantités telles que le rapport molaire de l'époxy silane et de l'amino silane dans le mélange de réaction soit inférieur à 1,8:1,0 et (2) on ajoute ensuite l'époxy silane supplémentaire au mélange de réaction de sorte que le rapport molaire de l'époxy silane et de l'amino silane soit au moins de 2:1 dans un solvant volatil. On a découvert que l'amorce de l'invention renforce la fixation d'un substrat non poreux, tel que du verre, sur un second substrat, notamment lorsqu'il est utilisé conjointement avec une colle "à durcissement rapide" se composant d'un prépolymère fonctionnel d'isocyanate et d'un dimorpholinodiéthyle éther. De plus, ces amorces peuvent être préparées plus facilement que les amorces qui nécessitent une "cuisson" du silane comprenant un produit de réaction d'un polyisocyanate et d'un ou plusieurs composés contenant du silane.

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