Flexible metal laminate

1. A flexible metal laminate consisting of:

a first thermosetting polyimide resin layer containing 5 wt % to 75 wt % of a fluorine-based resin;

a second thermosetting polyimide resin layer formed on at least one surface of the first thermosetting polyimide resin layer, and containing 1 wt % or less of the fluorine-based resin;

a thermoplastic polyimide resin layer formed on one surface of the second thermosetting polyimide resin layer so as to face the first thermosetting polyimide resin layer, and

at least one metal thin film consisting of one or more metals selected from the group consisting of copper, iron, nickel, titanium, aluminum, silver, gold, and an alloy of two or more thereof, and having a thickness of 0.1 μm to 50 μm,

wherein the first thermosetting polyimide resin layer and the second thermosetting polyimide resin layer include the same thermosetting polyimide resin; and

wherein the at least one metal thin film comprises two metal thin films facing each other, and the first thermosetting polyimide resin layer, the second thermosetting polyimide resin layer, and the thermoplastic polyimide resin layer are disposed between the two metal thin films facing each other.

2. The flexible metal laminate of claim 1 ,

wherein interfacial peel strength between the second thermosetting polyimide resin layer and the thermoplastic polyimide resin layer is 1.0 kgf/cm or more.

3. The flexible metal laminate of claim 1 ,

wherein the first thermosetting polyimide resin layer has a thickness of 1 μm to 100 μm.

4. The flexible metal laminate of claim 1 ,

wherein the second thermosetting polyimide resin layer has a thickness of 0.1 μm to 50 μm.

5. The flexible metal laminate of claim 1 ,

wherein a thickness ratio of the second thermosetting polyimide resin layer to the first thermosetting polyimide resin layer is 0.01 to 1.

6. The flexible metal laminate of claim 1 ,

wherein the thermoplastic polyimide resin layer has a thickness of 1 μm to 100 μm.

7. The flexible metal laminate of claim 1 ,

wherein the fluorine-based resin includes one or more selected from the group consisting of polytetrafluoroethylene (PTFE), a tetrafluoroethylene-perfluoroalkylvinylether copolymer (PFA), a tetrafluoroethylene-hexfluoropropylene copolymer (FEP), an ethylene-tetrafluoroethylene copolymer resin (ETFE), a tetrafluoroethylene-chlorotrifluoroethylene copolymer (TFE/CTFE), and an ethylene-chlorotrifluoroethylene resin (ECTFE).

8. The flexible metal laminate of claim 1 ,

wherein the fluorine-based resin is fluorine-based resin particles having a longest diameter of 0.05 μm to 20 μm.

9. The flexible metal laminate of claim 1 ,

wherein the first thermosetting polyimide resin layer or the second thermosetting polyimide resin layer includes a thermosetting polyimide resin having a weight average molecular weight of 5000 to 500,000.

10. The flexible metal laminate of claim 1 ,

wherein the first thermosetting polyimide resin layer or the second thermosetting polyimide resin layer includes a thermosetting polyimide resin containing a repeating unit of the following Chemical Formula 1:

wherein Y 1 is a tetravalent aromatic organic functional group, and X is a divalent aromatic organic functional group.

11. The flexible metal laminate of claim 10 ,

wherein Y 1 is a tetravalent functional group selected from the group consisting of following Chemical Formula 21 to 27:

wherein Y 1 is a single bond, —O—, —CO—, —S—, —SO 2 —, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —CONH—, —COO—, —(CH 2 )n 1 -, —O(CH 2 )n 2 O—, or —OCO(CH 2 )n 3 OCO—, respectively, in which n 1 , n 2 , and n 3 are an integer of 1 to 10, respectively,

wherein Y 2 and Y 3 are identical to or different from each other, and are a single bond, —O—, —CO—, —S—, —SO 2 —, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —CONH—, —COO—, —(CH 2 )n 1 -, —O(CH 2 )n 2 O—, or —OCO(CH 2 )n 3 OCO—, respectively, in which n 1 , n 2 , and n 3 are an integer of 1 to 10, respectively,

wherein Y 4 , Y 5 , and Y 6 are identical to or different from each other, and are a single bond, —O—, —CO—, —S—, —SO 2 —, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —CONH—, —COO—, —(CH 2 )n 1 -, —O(CH 2 )n 2 O—, or —OCO(CH 2 )n 3 OCO—, respectively, in which n 1 , n 2 , and n 3 are an integer of 1 to 10, respectively,

wherein ‘*’ is a bonding point in Chemical Formula 21 to 27.

12. The flexible metal laminate of claim 10 ,

wherein X is a divalent functional group selected from the group consisting of following Chemical Formula 31 to 34:

wherein R 1 is hydrogen, —CH 3 , —CH 2 CH 3 , —CH 2 CH 2 CH 2 CH 3 , —CF 3 , —CF 2 CF 3 , —CF 2 CF 2 CF 3 , or —CF 2 CF 2 CF 2 CF 3 ,

wherein L 1 is a single bond, —O—, —CO—, —S—, —SO 2 —, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —CONH—, —COO—, —(CH 2 )n 1 -, —O(CH 2 )n 2 O—, or —OCO(CH 2 )n 3 OCO—, respectively, in which n 1 , n 2 , and n 3 are an integer of 1 to 10, respectively; and

R 1 and R 2 are identical to or different from each other, and are hydrogen, —CH 3 , —CH 2 CH 3 , —CH 2 CH 2 CH 2 CH 3 , —CF 3 , —CF 2 CF 3 , —CF 2 CF 2 CF 3 , or —CF 2 CF 2 CF 2 CF 3 , respectively,

wherein L 2 and L 3 are identical to or different from each other, and are a single bond, —O—, —CO—, —S—, —SO 2 —, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —CONH—, —COO—, —(CH 2 )n 1 -, —O(CH 2 )n 2 O—, or —OCO(CH 2 )n 3 OCO—, respectively, in which n 1 , n 2 , and n 3 are an integer of 1 to 10, respectively; and

R 1 , R 2 , and R 3 are identical to or different from each other, and are hydrogen, —CH 3 , —CH 2 CH 3 , —CH 2 CH 2 CH 2 CH 3 , —CF 3 , —CF 2 CF 3 , —CF 2 CF 2 CF 3 , or —CF 2 CF 2 CF 2 CF 3 , respectively,

wherein L 4 , L 5 , and L 6 are identical to or different from each other, and are a single bond, —O—, —CO—, —S—, —SO 2 —, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —CONH—, —COO—, —(CH 2 )n 1 -, —O(CH 2 )n 2 O—, or —OCO(CH 2 )n 3 OCO—, respectively, in which n 1 , n 2 , and n 3 are an integer of 1 to 10, respectively; and

R 1 , R 2 , R 3 , and R 4 are identical to or different from each other, and are hydrogen, —CH 3 , —CH 2 CH 3 , —CH 2 CH 2 CH 2 CH 3 , —CF 3 , —CF 2 CF 3 , —CF 2 CF 2 CF 3 , or —CF 2 CF 2 CF 2 CF 3 , respectively,

wherein ‘*’ is a bonding point in Chemical Formula 31 to 34.