Heat-curable adhesive composition
The present invention provides a heat-curable adhesive composition comprising ethylene-glycidyl (meth)acrylate copolymer, low density polyethylene, ethylene-a-olefin copolymer, and a heat curing agent for the ethylene-glycidyl (meth)acrylate copolymer.
1. A heat-curable adhesive composition comprising:
an ethylene-glycidyl (meth)acrylate copolymer;
a low density polyethylene;
an ethylene-α-olefin copolymer; and
a heat curing agent for said ethylene-glycidyl (meth)acrylate copolymer, wherein said heat curing agent comprises a rosin having a carboxyl group in the molecule.
2. The heat-curable adhesive composition of claim 1 , wherein the minimum density of said low density polyethylene is at least about 0.910 as measured according to ASTM D1248-84.
3. The heat-curable adhesive composition of claim 1 , wherein the maximum density of said low density polyethylene is up to about 0.925 as measured according to ASTM D1248-84.
4. The heat-curable adhesive composition of claim 1 , wherein, in said ethylene-α-olefin copolymer, the polymerization ratio of ethylene to α-olefin is from about 90:10 to about 10:90.
5. The heat curable adhesive composition of claim 1 , wherein the minimum density of said ethylene-α-olefin copolymer is about 0.850 as measured according to ASTM D1248-84.
6. The heat curable adhesive composition of claim 1 , wherein the maximum density of said ethylene-α-olefin copolymer is up to about 0.909 as measured according to ASTM D1248-84.
7. The heat-curable adhesive composition of claim 1 , wherein said film has a thickness from about 5 to about 80 μm.
8. The heat-curable adhesive composition of claim 1 , wherein, after post-curing, the composition has a dielectric constant of about 2.5 or less, and a dielectric loss tangent of about 0.015 or less when measured at the frequency of about 1 GHz.