Fluororesin substrate laminate
The present disclosure relates to a fluororesin substrate laminate for a high-frequency circuit, the fluororesin substrate laminate including a fluororesin substrate and an adhesive layer provided on the fluororesin substrate, wherein the adhesive layer includes a resin composition containing: (A) a maleimide compound having a saturated or unsaturated divalent hydrocarbon group; and (B) an aromatic maleimide compound.
1. A fluororesin substrate laminate for a high-frequency circuit,
the fluororesin substrate laminate comprising a fluororesin substrate and an adhesive layer provided on the fluororesin substrate,
wherein the fluororesin substrate has
a dielectric loss tangent measured at a frequency of 10 GHz and a measurement temperature of 25° C. of 0.0010 to 0.0020, and
a coefficient of thermal expansion of 30 ppm/° C. or less in a direction of the fluororesin substrate,
wherein the fluororesin substrate has a thickness of 120 μm to 12700 μm, and
wherein the adhesive layer includes a resin composition containing: (A) a maleimide compound having a saturated or unsaturated divalent hydrocarbon group; and (B) an aromatic maleimide compound.
2. The fluororesin substrate laminate according to claim 1 , wherein the fluororesin substrate is a substrate including polytetrafluoroethylene.
3. The fluororesin substrate laminate according to claim 1 , wherein the (B) aromatic maleimide compound has a structure having a maleimide group bonded to an aromatic ring.
4. The fluororesin substrate laminate according to claim 1 , wherein the saturated or unsaturated divalent hydrocarbon group has 8 to 100 carbon atoms.
5. The fluororesin substrate laminate according to claim 1 , wherein the saturated or unsaturated divalent hydrocarbon group is a group represented by the following Formula (II):
wherein in Formula (II), R 2 and R 3 each independently represent an alkylene group having 4 to 50 carbon atoms; R 4 represents an alkyl group having 4 to 50 carbon atoms; and R 5 represents an alkyl group having 2 to 50 carbon atoms.
6. The fluororesin substrate laminate according to claim 1 , wherein the (A) maleimide compound having a saturated or unsaturated divalent hydrocarbon group further has a divalent group having at least two imide bonds.
7. The fluororesin substrate laminate according to claim 6 , wherein the divalent group having at least two imide bonds is a group represented by the following Formula (I):
wherein in Formula (I), R 1 represents a tetravalent organic group.
8. The fluororesin substrate laminate according to claim 1 , wherein the (A) maleimide compound having a saturated or unsaturated divalent hydrocarbon group has a weight average molecular weight of 500 to 10000.
9. The fluororesin substrate laminate according to claim 1 , further comprising a metal foil on the adhesive layer.
10. The fluororesin substrate laminate according to claim 9 , wherein the metal foil has a surface roughness of 0.05 to 2 μm.
11. The fluororesin substrate laminate according to claim 1 , wherein the resin composition further comprises a cyanate ester resin.
12. The fluororesin substrate laminate according to claim 1 , wherein the resin composition further comprises a styrene-ethylene-butylene copolymer modified with maleic anhydride.
13. The fluororesin substrate laminate according to claim 1 , wherein the fluororesin substrate has a dielectric loss tangent measured at a frequency of 10 GHz and a measurement temperature of 25° C. of 0.0010 to 0.0013.
14. The fluororesin substrate laminate according to claim 1 , wherein the fluororesin substrate has a dielectric constant measured at a frequency of 10 GHz and a measurement temperature of 25° C. of 2.2 to 3.5.