Method for producing product, adhesive composition and foaming adhesive sheet

1 . A method for producing a product, the method comprising:

a placing step of placing an adhesive composition, including a thermosetting resin and a foaming agent, between a first member and a second member; and

an adhering step of adhering the first member and the second member by foaming and curing the adhesive composition by heating,

wherein the foaming agent is a thermally expandable microcapsule;

A<B when following conditions are satisfied,

in a foaming ratio-time curve where time is on a horizontal axis and a foaming ratio of the foaming agent is on a vertical axis, when a differential scanning calorimetry is carried out to the foaming agent, using a differential scanning calorimeter including a camera, under heating conditions in the adhering step, a slope of a tangent line to the curve at a top of a peak, on a longer time side of the peak, is regarded as A, and

in a DSC curve where time is on a horizontal axis and a heat flow is on a vertical axis, when a differential scanning calorimetry is carried out to the adhesive composition under the heating conditions in the adhering step, a slope of a tangent line to the curve at a top of an exothermic peak, on a longer time side of the exothermic peak, is regarded as B; and

the adhesive composition is heated so that T1<T2 when following conditions are satisfied in the adhering step,

in a foaming ratio-time curve where time is on a horizontal axis and a foaming ratio of the foaming agent is on a vertical axis, when a differential scanning calorimetry is carried out to the foaming agent, using a differential scanning calorimeter including a camera, time corresponding to a top of a peak is regarded as T1, and

in a DSC curve where time is on a horizontal axis and a heat flow is on a vertical axis, when a differential scanning calorimetry is carried out to a composition where the foaming agent is excluded from the adhesive composition, time corresponding to a top of an exothermic peak is regarded as T2.

2 . The method for producing a product according to claim 1 , wherein a heating temperature in the adhering step is in a range of ±20° C. of a maximum foaming temperature of the foaming agent.

3 . The method for producing a product according to claim 1 , wherein, in the placing step, a foaming adhesive sheet including an adhesive layer including the adhesive composition is used, and the foaming adhesive sheet is placed between the first member and the second member.

4 . An adhesive composition comprising a thermosetting resin and a foaming agent,

wherein the foaming agent is a thermally expandable microcapsule;

C<D when following conditions are satisfied,

in a foaming ratio-time curve where time is on a horizontal axis and a foaming ratio of the foaming agent is on a vertical axis, when a differential scanning calorimetry is carried out to the foaming agent, using a differential scanning calorimeter including a camera, under heating conditions of rising temperature from room temperature to a maximum foaming temperature of the foaming agent in 5 minutes, and holding at the maximum foaming temperature of the foaming agent, a slope of a tangent line to the curve at a top of a peak, on a longer time side of the peak, is regarded as C, and

in a DSC curve where time is on a horizontal axis and a heat flow is on a vertical axis, when a differential scanning calorimetry is carried out to the adhesive composition under the heating conditions described above, a slope of a tangent line to the curve at a top of an exothermic peak, on a longer time side of the exothermic peak, is regarded as D; and

the adhesive composition is used by heating thereof so that T1<T2 when following conditions are satisfied,

in a foaming ratio-time curve where time is on a horizontal axis and a foaming ratio of the foaming agent is on a vertical axis, when a differential scanning calorimetry is carried out to the foaming agent, using a differential scanning calorimeter including a camera, time corresponding to a top of a peak is regarded as T1, and

in a DSC curve where time is on a horizontal axis and a heat flow is on a vertical axis, when a differential scanning calorimetry is carried out to a composition where the foaming agent is excluded from the adhesive composition, time corresponding to a top of an exothermic peak is regarded as T2.

5 . A foaming adhesive sheet comprising an adhesive layer,

wherein the adhesive layer includes the adhesive composition according to claim 4 .