Sheet adhesive and adhesion process using the same
It has conventionally been difficult to achieve a sheet adhesive which adheres in a low temperature (from 20 to 90° C.), and has both of softness and high adhering strength. The present invention realizes a sheet adhesive capable of adhering in a low temperature (from 20 to 90° C.) which exhibits a high adhesiveness in spite of being a soft sheet of thin film, by forming a simulated multiple layer by using an elastomer as a substrate layer, and by forming a reactive layer by means of spraying or application. A sheet adhesive including a substrate layer and a reactive layer, wherein the substrate layer includes a component (A) and a component (B) below, and the reactive layer is formed with a liquid agent including a component (C) below in an amount of from 0.01% by mass to 45% by mass, component (A): a urethane elastomer, component (B): an epoxy resin, component (C): an amine compound and/or phenol compound.
1. A sheet adhesive comprising a substrate layer and a reactive layer, wherein
the substrate layer comprises a component (A) and a component (B) below, and
the reactive layer is formed with a liquid agent comprising a component (C) below in an amount of from 0.01% by mass to 45% by mass, where said component (C) of said reactive layer is able to react with said component (B),
component (A): a urethane elastomer,
component (B): an epoxy resin,
component (C): an amine compound and/or phenol compound.
2. The sheet adhesive according to claim 1 , wherein the epoxy resin is a solid at 25° C.
3. The sheet adhesive according to claim 1 , wherein the substrate layer is a substrate layer formed with the component (A) and the component (B) in a state compatibilized with each other.
4. The sheet adhesive according to claim 1 , wherein the liquid agent further comprises a coupling agent as a component (E).
5. A thermal curing-type sheet adhesive which comprises the sheet adhesive according to claim 1 .
6. A normal temperature curing-type sheet adhesive which comprises the sheet adhesive according to claim 1 .
7. The sheet adhesive according to claim 1 , where said liquid agent for forming said reactive layer further comprises a solvent (D).
8. The sheet adhesive according to claim 1 , wherein said substrate layer is supported by a first adherend, and said reactive layer is supported by a second adherend.