| 主权项 |
1. A laminate for a touch panel comprising:
an adhesive layer; and a capacitance touch panel sensor, wherein the adhesive layer includes a poly(meth)acrylate which is formed by polymerizing a (meth)acrylate compound and which has a polycyclic aliphatic hydrocarbon group and a saturated chain hydrocarbon group, the (meth)acrylate compound includes at least one type or two or more types of (meth)acrylate X which is represented by Formula (X) and which has a polycyclic aliphatic hydrocarbon group with 7 to 30 carbon atoms and one type or two or more types of (meth)acrylate Y which is represented by Formula (Y) and which has a saturated chain hydrocarbon group with 8 to 30 carbon atoms, a content of the (meth)acrylate X is 25.0 mass % to 41.0 mass % with respect to a total mass of the (meth)acrylate compound, a content of the (meth)acrylate Y is 58.0 mass % to 70.0 mass % with respect to a total mass of the (meth)acrylate compound, an ester group mass ratio EX which is represented by Equation (1) described below is 5.0 mass % to 9.0 mass %, an ester group mass ratio EY which is represented by Equation (2) described below is 12.0 mass % to 18.0 mass %, an acid value and a hydroxyl number of the poly(meth)acrylate is 0 mgKOH/g, the poly(meth)acrylate does not include a urethane bond, a urea bond, an amide bond, or an alkyl substituted amino group, the adhesive layer does not include polyurethane and polyurea, a temperature dependency of relative permittivity of the adhesive layer which is obtained from a temperature dependency evaluation test described below is 30% or less, and a maximum value of relative permittivity at each temperature every 20° C. from −40° C. to 80° C. is 3.5 or less,EX(%)=∑i=1n(RXi×WXi)Equation(1)EY(%)=∑i=1m(RYi×WYi)Equation(2) in Formula (X), R1 represents a hydrogen atom or an alkyl group, and R2 represents a polycyclic aliphatic hydrocarbon group with 7 to 30 carbon atoms, in Formula (Y), R3 represents a hydrogen atom or an alkyl group, and R4 represents a saturated chain hydrocarbon group with 8 to 30 carbon atoms, in Equation (1), n represents the number of types of the (meth)acrylate X, RXi indicates a ratio of a molecular weight of an ester group (—COO—) in the i-th (meth)acrylate X with respect to a total molecular weight of the i-th type of (meth)acrylate X, WXi indicates a mass ratio (%) of the i-th (meth)acrylate X with respect to a total mass of the (meth)acrylate compound, and, here, a ratio of the molecular weight of the ester group (—COO—) in the i-th (meth)acrylate X is represented by a molecular weight of ester group/total molecular weight of i-th (meth)acrylate X, in Equation (2), m represents a number of types of the (meth)acrylate Y, RYi indicates a ratio of a molecular weight of an ester group (—COO—) in i-th (meth)acrylate Y with respect to a total molecular weight of the i-th type (meth)acrylate Y, WYi indicates a mass ratio (%) of the i-th (meth)acrylate Y with respect to a total mass of the (meth)acrylate compound, and, here, a ratio of the molecular weight of the ester group (—COO—) in the i-th (meth)acrylate Y is represented by molecular weight of ester group/total molecular weight of i-th (meth)acrylate Y, and a temperature dependency evaluation test is a test in which an adhesive layer is interposed between aluminum electrodes, temperature is increased from −40° C. to 80° C. by 20° C. each time, a relative permittivity of the adhesive layer is calculated by impedance measurement at 1 MHz at each temperature, a minimum value and a maximum value are selected from the calculated relative permittivity at each temperature, and a value (%) which is obtained from Equation [(maximum value−minimum value)/minimum value×100] is the temperature dependency. |
