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US 12,703,809 B2Granted
Method for producing product, adhesive composition and foaming adhesive sheet
AssigneeDai Nippon Printing Co., Ltd.
InventorsKentaro Hoshi, Izumi Hasegawa, Shinya Shimada, Junko Kodani, Nobuyuki Kanda
Life of this patent
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Abstract
A method for producing a product, the method including: 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; the adhesive composition has predetermined properties; and the adhesive composition is heated under predetermined heating conditions in the adhering step.
Claims5
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.
8 more elements
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 more elements
Dependencies are inferred from the claim text.