Adhesive for electrical storage device packaging material, electrical storage device packaging material, electrical storage device container, and electrical storage device
An adhesive for an electrical storage device packaging material containing a polyol compound (A), a polyisocyanate compound (B), and an epoxy resin (C), in which the polyol compound (A) contains an ester bond-containing polyol, and the following formula is satisfied when a stress at the time when a cured film obtained by performing curing under the condition of 80° C. for 2 weeks is stretched to twice its length at a speed of 6 mm/min under an environment of 20° C. and 65% RH is S1 [N/mm 2 ], and a stress at the time when the cured film is held for 100 seconds in a stretched state is S2 [N/mm 2 ]. Formula: 10.0≤(S1−S2)/S1×100≤40.0.
1 . An adhesive for an electrical storage device packaging material containing a polyol compound (A), a polyisocyanate compound (B), and an epoxy resin (C), wherein
the polyol compound (A) contains an ester bond-containing polyol, wherein the ester bond-containing polyol has an ester bond concentration of 8.5 to 10.5 [mmol/g], and has a weight average molecular weight of 55,000 to 85,000, and
the following formula is satisfied when a stress at the time when a cured film obtained by curing the adhesive for an electrical storage device packaging material under the condition of 80° C. for 2 weeks is stretched in a stretched state to twice its length at a speed of 6 mm/min under an environment of 20° C. and 65% RH is S1 [N/mm 2 ], and a stress at the time when the cured film is held for 100 seconds in the stretched state is S2 [N/mm 2 ]
10.0≤( S 1 −S 2)/ S 1×100≤40.0. Formula:
2 . The adhesive for an electrical storage device packaging material according to claim 1 , wherein
the epoxy resin (C) has an epoxy equivalent weight of 90 to 1,200 [g/eq].
3 . The adhesive for an electrical storage device packaging material according to claim 1 , wherein
the ester bond-containing polyol of the polyol compound (A) is a polyester polyol, and the epoxy resin (C) contains an epoxy resin having an epoxy equivalent weight of 150 to 1,000 [g/eq].
4 . The adhesive for an electrical storage device packaging material according to claim 1 , wherein
the ester bond-containing polyol of the polyol compound (A) is a polyester urethane polyol, and the epoxy resin (C) contains an epoxy resin having an epoxy equivalent weight of 100 to 450 [g/eq].
5 . The adhesive for an electrical storage device packaging material according to claim 1 , wherein
a storage elastic modulus of the cured film at 120° C. is 1.00×10 5 to 9.99×10 7 [Pa].
6 . The adhesive for an electrical storage device packaging material according to claim 3 , wherein
a storage elastic modulus of the cured film at 120° C. is 1.00×10 5 to 9.99×10 7 [Pa].
7 . The adhesive for an electrical storage device packaging material according to claim 4 , wherein
a storage elastic modulus of the cured film at 120° C. is 1.00×10 5 to 9.99×10 7 [Pa].
8 . An electrical storage device packaging material having a configuration in which at least an outer layer side resin film layer, an outer layer side adhesive layer, a metal foil layer, an inner layer side adhesive layer, and a heat seal layer are sequentially laminated, wherein
the outer layer side adhesive layer is a cured product of the adhesive for an electrical storage device packaging material according to claim 1 .
9 . An electrical storage device container formed from the electrical storage device packaging material according to claim 8 , wherein
the outer layer side resin film layer forms a convex surface and the heat seal layer forms a concave surface.
10 . An electrical storage device comprising:
the electrical storage device container according to claim 9 .