Adhesive resin composition, method for bonding adherends, and adhesive resin film
The present invention provides an adhesive resin composition that has excellent adhesiveness and durability, a method for bonding adherends, and an adhesive resin film. More specifically, the present invention relates to an adhesive resin composition containing more than 50 parts by mass and 99.5 parts by mass or less in a solid content of an acid-modified polyolefin resin having a melting point of 50 to 100° C., 0.5 parts by mass or more and less than 50 parts by mass in a solid content of an epoxy resin having a novolac structure, and an organic solvent; a method for bonding adherends including forming an adhesive layer on a first adherend by applying the adhesive resin composition and drying, and then bonding a second adherend to the adhesive layer by laminating the second adherend on the adhesive layer; and an adhesive resin film including a first adhesive layer, a substrate layer, and a second adhesive layer in that order, in which any one or both of the first adhesive layer and the second adhesive layer include(s) the adhesive resin composition.
1. An adhesive resin composition consisting of:
more than 50 parts by mass and 99.5 parts by mass or less in a solid content of an acid-modified polyolefin resin (A) having a melting point of 50 to 100° C.;
0.5 parts by mass or more and less than 50 parts by mass in a solid content of an epoxy resin (B) having a novolac structure; and
an organic solvent (C),
wherein said acid-modified polyolefin resin (A) has a methyl group and an ethyl group on a side chain,
said organic solvent (C) includes toluene and methyl ethyl ketone, and
said epoxy resin (B) having the novolac structure is a bisphenol A novolac epoxy resin represented by formula (1):
wherein, R 1 to R 6 each are independently a hydrogen atom or a methyl group, n is an integer of 0 to 10, and R X is a group having an epoxy group, and
R 1 to R 6 satisfy at least any one of (i) to (iii):
(i) both of R 1 and R 2 are a methyl group;
(ii) both of R 3 and R 4 are a methyl group; and
(iii) both of R 5 and R 6 are a methyl group, and
wherein in dynamic viscoelasticity measurement, an adhesive resin film formed including said adhesive resin composition has a storage modulus value at 60° C. of 1.0×10 6 to 1.0×10 8 Pa and a storage modulus value at 150° C. of 1.0×10 4 to 1.0×10 8 Pa.
2. The adhesive resin composition according to claim 1 , consisting of:
70 parts by mass or more and 99.5 parts by mass or less in a solid content of said acid-modified polyolefin resin (A); and
0.5 parts by mass or more and 30 parts by mass or less in a solid content of said epoxy resin (B) having the novolac structure; and said organic solvent (C).
3. The adhesive resin composition according to claim 1 , wherein said bisphenol A novolac epoxy resin has an epoxy equivalent of 100 to 300.