Adhesive
To provide an adhesive excellent in heat resistance and adhesive property. An adhesive comprising a fluorinated polymer having a weight average molecular weight (Mw) of from 6×10 3 to 3×10 4 and having iodine atoms at both terminals, and a radical generator. The fluorinated polymer has structural units derived from at least one monomer selected from the group consisting of tetrafluoroethylene, vinylidene fluoride, hexafluoropropylene and a perfluoro(alkyl vinyl ether).
1. An adhesive comprising: a fluorinated polymer having a weight average molecular weight (Mw) of from 1.4×10 4 to 2×10 4 and having iodine atoms at both terminals; and a radical generator, wherein a ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the fluorinated polymer is from 1.00 to 1.35, and an amount of the radical generator is from 0.5 to 5.0 mass % with respect to 100 mass % of the adhesive.
2. The adhesive according to claim 1 , wherein the fluorinated polymer comprises structural units derived from at least one monomer selected from the group consisting of tetrafluoroethylene, vinylidene fluoride, hexafluoropropylene and a perfluoro(alkyl vinyl ether).
3. The adhesive according to claim 1 , wherein the fluorinated polymer comprises structural units derived from vinylidene fluoride and structural units derived from hexafluoropropylene, and the content ratio (HFP/VdF) of the structural units derived from hexafluoropropylene to the structural units derived from vinylidene fluoride is from 0.4 to 1.0 based on mass.
4. The adhesive according to claim 1 , wherein the fluorinated polymer comprises structural units derived from tetrafluoroethylene and structural units derived from propylene, and the content ratio (P/TFE) of the structural units derived from propylene to the structural units derived from tetrafluoroethylene is from 0.2 to 1.0 based on mass.
5. The adhesive according to claim 1 , further comprising a compound having at least 2 ethylenic unsaturated bonds.
6. The adhesive according to claim 1 , wherein the content of a volatile component in the adhesive is at most 50 mass %.
7. The adhesive according to claim 1 , wherein the adhesive is suitable for bonding metals.
8. A method for bonding a first member and a second member, comprising:
applying the adhesive as defined in claim 1 between the first member and the second member to obtain a laminate; and
subjecting the obtained laminate to heat treatment.
9. A method for producing an adhered body, comprising:
applying the adhesive as defined in claim 1 between a first member and a second member to obtain a laminate; and
subjecting the obtained laminate to heat treatment to obtain the adhered body.
10. The adhesive according to claim 1 , wherein the radical generator is at least one selected from the group consisting of bis(perfluorobenzoyl) peroxide, 1,1-bis(tert-butylperoxy)-3,5,5-trimethylcyclohexane, 2,5-dimethylhexane-2,5-dihydroxy peroxide, di-tert-butyl peroxide, tert-butylcumyl peroxide, dicumyl peroxide, α,α′-bis(tert-butylperoxy)-p-diisopropylbenzene, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexyne-3, benzoyl peroxide, tert-butylperoxybenzene, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, tert-butylperoxy maleic acid, tert-butylperoxyisopropylcarbonate, peracetic acid and m-chloroperbenzoic acid.
11. The adhesive according to claim 10 , wherein the adhesive further comprises a crosslinking coagent which is at least one selected from the group consisting of triallyl cyanurate, triallyl isocyanurate, triacryl formal, triallyl trimellitate, N,N′-m-phenylene bismaleimide, dipropargyl terephthalate, and tetraallyl terephthalamide.
12. The adhesive according to claim 1 , wherein the content of fluorine atoms in the fluorinated polymer is from 20 to 75 mass %.
13. The adhesive according to claim 1 , wherein the content of fluorine atoms in the fluorinated polymer is from 30 to 75 mass %.
14. The adhesive according to claim 1 , wherein the content of a volatile component in the adhesive is at most 30 mass %.
15. The adhesive according to claim 1 , wherein the content of a volatile component in the adhesive is at most 10 mass %.
16. The adhesive according to claim 1 , wherein the fluorinated polymer is a straight-chain polymer having one iodine atom at each of both terminals.
17. The adhesive according to claim 16 , wherein the adhesive further comprises a crosslinking coagent which is at least one selected from the group consisting of triallyl cyanurate, triallyl isocyanurate, triacryl formal, triallyl trimellitate, N,N′-m-phenylene bismaleimide, dipropargyl terephthalate, and tetraallyl terephthalamide.
18. The adhesive according to claim 1 , wherein the adhesive further comprises a crosslinking coagent which is at least one selected from the group consisting of triallyl cyanurate, triallyl isocyanurate, triacryl formal, triallyl trimellitate, N,N′-m-phenylene bismaleimide, dipropargyl terephthalate, and tetraallyl terephthalamide.