Curable compounds containing reactive groups: triazine/isocyanurates, cyanate esters and blocked isocyanates
View Patent ↗This invention is directed to compounds that can be used as antioxidants for exposed metal surfaces, and also as adhesion promoters for adhesive, coating or encapsulant resins that are applied to the metal substrates. These compounds include triazine or isocyanurate compounds bearing reactive or polymerizable functional groups, polyfunctional cyanate esters, and polyfunctional blocked-isocyanates.
1. A copper coated leadframe onto which is deposited first a solution of
(i) a triazine or isocyanurate compound containing a polymerizable functionality,
(ii) a cyanate ester compound, or
(iii) a blocked isocyanate compound; and
second an adhesive and a semiconductor die in which the adhesive is in contact with the solution of triazine, isocyanurate, cyanate ester, or blocked isocyanate compound and in which the adhesive contains a polymerizable functionality reactive with the triazine, isocyanurate, cyanate ester, or blocked isocyanaye compound.
2. The copper coated leadframe according to claim 1 in which the solution is an aqueous solution with a concentration range from 0,05 to 20% w/w.
3. The copper coated leadframe according to claim 3 in which the solution is an aqueous solution with a concentration range from 0.1 to 10% w/w.
4. The copper coated leadframe according to claim 1 in which the solution is an organic solution with a concentration range from 0.1 to 2% w/w.
5. The copper coated leadframe according to claim 1 in which the triazine has the structure
in which R 1 , R 2 , and R 3 represent an organic moiety containing an epoxy, allyl, amine, vinylether, hydroxyl, acrylate or methacrylate group.
6. The copper coated leadframe according to claim 1 in which the isocyanurate has the structure
in which R 1 , R 2 , and R 3 represent an organic moiety containing an epoxy, allyl, amine, vinylether, hydroxyl, acrylate or methacrylate group.
7. The copper coated leadframe according to claim 1 in which the cyanate ester has the structure
in which R 4 is
R 5 is H or CH 3 .
8. The copper coated leadframe according to claim 1 in which the blocked isocyanate compound is an adduct of an isocyanate selected from the group consisting of tolylene diisocyanate, hexane diisocyanate trimer, hexane dilsocyanate biuret, isophorone dilsocyanate, and isophorone diisocyanate trimer with a blocking group selected from the group consisting of 3,5-dimethyl pyrazole, oxime, methylethyl ketoxime, ε-caprolactam, and diethyl melonate.