Resin film and uses thereof

1. A resin film, which comprises an epoxy resin and a cyanate resin, wherein when the resin film is characterized by Fourier transform infrared spectroscopy (FTIR), the Fourier transform infrared spectrum of the resin film has a signal intensity A from 2205 cm −1 to 2322 cm −1 and a signal intensity B from 1472 cm −1 to 1523 cm −1 , and 0.70≤ A/B≤1.95.

2. The resin film of claim 1 , wherein the Fourier transform infrared spectroscopy is performed as follows by using a Fourier transform infrared spectroscopy instrument: placing the resin film in the Fourier transform infrared spectroscopy instrument, measuring an absorption spectrum in a range from 650 cm −1 to 4000 cm −1 , and using an attenuated total reflectance method to measure the signal intensities A and B, wherein the resolution of the Fourier transform infrared spectroscopy instrument is 1 cm −1 , the scan number of the spectrum is 12, and the signal intensities are the absorbance at respective wavelengths.

3. The resin film of claim 1 , wherein the Fourier transform infrared spectrum of the resin film has a signal intensity C from 2943 cm −1 to 2990 cm −1 , and 0.05≤ C/B≤0.4.

4. The resin film of claim 1 , wherein the epoxy resin is an epoxy resin with a conjugated unsaturated bond.

5. The resin film of claim 4 , wherein the epoxy resin is an aromatic epoxy resin.

6. The resin film of claim 1 , wherein the epoxy resin is selected from the group consisting of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, phenolic epoxy resin, biphenyl epoxy resin, aralkyl epoxy resin, naphthalene epoxy resin, naphthol epoxy resin, epoxides of condensates of phenol and aromatic aldehyde with phenolic hydroxyl groups, biphenyl aralkyl epoxy resin, fluorene epoxy resin, xanthene epoxy resin, dicyclopentadiene epoxy resin, poly(triglycidyl isocyanurate), and combinations thereof.

7. The resin film of claim 1 , wherein the cyanate resin is selected from the group consisting of bisphenol A dicyanate, bisphenol E cyanate resin, bisphenol F dicyanate, bisphenol S dicyanate, phenolic cyanate resin, biphenyl dicyanate, biphenol dicyanate, hexafluoro bisphenol A dicyanate, 2,2-bis(4-cyanate)phenyl propane, 1,1-bis(4-cyanate phenyl methane), bis(4-cyanate-3,5-dimethyl phenyl)methane, 1,3-bis(4-cyanate phenyl-1-(methyl ethylidene))benzene, bis(4-cyanate phenyl)sulfide, bis(4-cyanate phenyl)ether, phenolic cyanate resins containing a dicyclopentadiene structure, and combinations thereof.

8. The resin film of claim 1 , which further comprises a filler, and the amount of the filler is 70 wt % to 88 wt % based on the solid content of the resin film.

9. The resin film of claim 8 , wherein the filler is selected from the group consisting of silica, aluminum oxide, magnesium oxide, magnesium hydroxide, calcium carbonate, talc, clay, aluminum nitride, boron nitride, aluminum hydroxide, silicon aluminum carbide, silicon carbide, sodium carbonate, titanium dioxide, zinc oxide, zirconium oxide, quartz, diamond, diamond-like carbon, graphite, calcined kaolin, pryan, mica, hydrotalcite, polytetrafluoroethylene (PTFE) powders, glass beads, ceramic whiskers, carbon nanotubes, strontium titanate, and combinations thereof.

10. The resin film of claim 1 , which further comprises carbon black.

11. The resin film of claim 1 , which further comprises a curing accelerator selected from the group consisting of amine-based curing accelerators, guanidine-based curing accelerators, imidazole-based curing accelerators, and combinations thereof.

12. The resin film of claim 1 , wherein the resin film has a thickness of 25 μm to 300 μm.

13. A copper-clad laminate, which comprises a dielectric layer and a copper foil covering a surface of the dielectric layer, wherein the dielectric layer is provided from the resin film of claim 1 .

14. A packaging material, which comprises the resin film of claim 1 .