Composition of aromatic or cycloaliphatic amine-derived polyepoxide and polyamine
View Patent ↗Disclosed is a curable composition having a low CTE. In one embodiment, a curable composition is disclosed that comprises (i) a binder comprising at least one epoxy compound of the structure: X—((CH 2 ) m —(N)—((CH 2 ) n -(Z)) 2 ) p wherein X is an aromatic ring or a six membered cycloaliphatic ring, m is from about 0 to about 2, n is from about 1 to about 3, Z is an epoxy group of empirical formula: C 2 H 3 O, p is a number from about 2 to about 3, and (ii) a cross-linking agent comprising at least one polyamine. This curable composition is characterized by a CTE of no more than 60 ppm/° C. when cured for a time of from about 20 to about 60 minutes at temperature of from about 100 to 240° C. Also disclosed are methods of making integrated circuits and integrated circuits made there from, especially flip chips.
1. A curable composition, comprising
(i) a binder comprising at least one epoxy compound of the structure:
X—((CH 2 ) m —(N)—((CH 2 ) n -(Z)) 2 ) p
wherein X is an aromatic ring or a six membered cycloaliphatic ring, m is from about 0 to about 2, n is from about 1 to about 3, Z is an epoxy group of empirical formula C2H3O, p is a number from about 2 to about 3, and
(ii) a cross-linking agent comprising at least one of 1,3-bis(3-aminophenoxy)benzene, 1,3-bis(4-aminophenoxy)benzene, or 1,4-bis(4-aminophenoxy)benzene,
wherein the curable composition has a coefficient of thermal expansion (CTE) of no more than 60 ppm/° C. when cured for a time of from about 20 to about 60 minutes at temperature of from about 100 to 240° C.
2. The curable composition of claim 1 comprising no more than 20 % by weight of traditional CTE lowering fillers, based on the total nonvolatile weight of curable composition.
3. The curable composition of claim 2 that is substantially without traditional CTE lowering fillers.
4. The curable composition of claim 1 wherein the binder comprises at least one epoxy compound of the structure:
X—((CH 2 ) m —(N)—((CH 2 ) n -(Z)) 2 ) p
wherein X is an aromatic ring, m is from 0 to about 1, and n is from about 1 to 2.
5. The curable composition of claim 4 wherein the at least one epoxy compound is N, N, N′, N′-tetraglycidyl-meta-xylenediamine.
6. The curable composition of claim 1 further comprising a catalyst (iii).
7. The curable composition of claim 1 further comprising at least one of additives, accelerators, diluents, coupling agents, adhesion agents, fluxing agents, impact modifiers, aliphatic amines, stabilizers, antioxidants, antifoaming agents, flame retardants, and combinations comprising two or more of the foregoing.