Curable epoxy resin compositions having improved adhesion to metal substrates and processes for making and using the same

摘要

Thermosettable compositions are described having improved adhesion to metal substrates when cured comprising (a) at least one curable epoxy resin; (b) at least one hardener, each hardener having less than 1 primary amine group per molecule and not more than 1 secondary amine group per molecule, the hardener(s) comprising at least one polyhydroxy hydrocarbon, hydrocarbon capable of generating multiple hydroxy groups per molecule during curing of the thermosettable material, or poly(acid anhydride)hydrocarbon other than a blend of (1) a copolymer of an ethylenically unsaturated anhydride and a vinyl compound and (2) a copolymer of an ethylenically unsaturated anhydride and an elastomer, and (c) at least one triblock copolymer comprising at least one elastomeric block and at least one acrylic block. Processes for making a coated article, a fiber-reinforced composite article, prepregs and laminates using the thermosettable compositions are also described, which are useful for making coated articles, fiber-reinforced composites, prepregs, laminates and printed wiring boards.

主权项

1. A thermosettable composition having improved adhesion to metal substrates when cured comprising:
(a) at least one curable flame retardant epoxy resin comprising a diglycidyl ether of tetrabromobisphenol A and/or a phosphorus-containing epoxy resin; (b) at least one hardener, each hardener having less than 1 primary amine group per molecule and not more than 1 secondary amine group per molecule, the hardener comprising
i) at least one polyhydroxy hydrocarbon and/or a hydrocarbon compound capable of generating multiple hydroxy groups per molecule during curing of the thermosettable material, andii) a poly(acid anhydride) hydrocarbon selected from the group consisting of a copolymer of an ethylenically unsaturated anhydride and an elastomer, a maleic anhydride adduct of methylcyclopentadiene, and combinations thereof; and (c) at least one triblock copolymer comprising at least one elastomeric block and at least one acrylic block; wherein the composition provides a prepreg formulation having a prepreg minimum melt viscosity of at least 20 Pa·s at a prepreg gel time of 60 seconds; and wherein the composition provides a formulation having a copper peel strength of at least 10 N/cm when cured; and wherein, during curing of the thermosetting material, the weight ratio of the total amount of the poly(acid anhydride) hydrocarbon to the polyhydroxy hydrocarbon and/or the compound capable of generating multiple hydroxyl groups per molecule is not greater than 1:3.