Sheet and composite sheet

1. A sheet comprising:

a pre-sintering layer;

a first release liner arranged over a first face of the pre-sintering layer; and

a second release liner arranged over a second face of the pre-sintering layer,

wherein the second face is provided opposite the first face;

wherein thickness of the pre-sintering layer is 30 μm to 200 μm;

wherein a viscosity at 90° C. of the pre-sintering layer is not less than 0.27 MPa·s;

wherein the pre-sintering layer comprises metal particles;

wherein the metal particles comprise at least one species selected from the group consisting of silver particles, copper particles, silver oxide particles, and copper oxide particles;

wherein the metal particles are present in an amount that is 50 wt % to 98 wt % per 100 wt % of the pre-sintering layer;

wherein the metal particles become a sintered body when temperature is increased from 80° C. to 300° C. at a temperature rise rate of 1.5° C./second and is held at 300° C. for 2.5 minutes;

wherein the pre-sintering layer further comprises a binder which is solid at 23° C., wherein the binder comprises acrylic polymer and/or polycarbonate;

wherein the binder is present in an amount that is 0.5 wt % to 20 wt % per 100 wt % of the pre-sintering layer; and

wherein the pre-sintering layer further comprises at least one low-boiling-point binder which has a boiling point between 100° C. and 350° C. selected from the group consisting of monohydric alcohols, polyhydric alcohols, and ethers.

2. The sheet according to claim 1 ,

wherein, when a pre-sintering laminated body having a substrate, a chip, and the pre-sintering layer sandwiched between the substrate and the chip is heated under Condition 1, below, to cause the pre-sintering layer to become the sintered body, a thickness of the sintered body is 40% to 80% where a thickness of the pre-sintering layer is taken to be 100%;

wherein Condition 1 is that a flat press is used to apply a pressure of 10 MPa to the pre-sintering laminated body as temperature is increased 1.5° C./second from 80° C. to 300° C., and to apply the pressure as 300° C. is maintained for 2.5 minutes.

3. The sheet according to claim 1 ,

wherein the pre-sintering layer is used to form a joint between a first object and a second object.

4. The sheet according to claim 1 ,

wherein the binder has a property such that a carbon concentration of the binder is not greater than 15 wt % following an increase in temperature from 23° C. to 400° C. at a temperature rise rate of 10° C./min in air.

5. The sheet according to claim 1 , wherein an average particle diameter of the metal particles is not greater than 1000 nm.

6. The sheet according to claim 1 , wherein an average particle diameter of the metal particles is not greater than 100 nm.

7. The sheet according to claim 1 wherein the binder comprises polycarbonate, and wherein the polycarbonate is aliphatic polycarbonate.

8. The sheet according to claim 1 wherein the binder comprises polycarbonate, and wherein the polycarbonate is polypropylene carbonate.

9. The sheet according to claim 1 wherein the binder comprises polycarbonate, and wherein the polycarbonate has a property such that carbon concentration is not greater than 15 wt % following an increase in temperature from 23° C. to 400° C. at a temperature rise rate of 10° C./min in air.

10. The sheet according to claim 1 wherein the low-boiling-point binder is at least one compound selected from the group consisting of: pentanol, hexanol, heptanol, octanol, 1-decanol, ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, alpha-terpineol, 1,6-hexanediol, isobornyl cyclohexanol (MTPH), and the ethers.

11. The sheet according to claim 1 wherein the low-boiling-point binder is isobornyl cyclohexanol (MTPH).

12. A sheet comprising a pre-sintering layer; and

a dicing sheet arranged over the pre-sintering layer;

wherein thickness of the pre-sintering layer is 30 μm to 200 μm;

wherein a viscosity at 90° C. of the pre-sintering layer is not less than 0.27 MPa·s;

wherein the pre-sintering layer comprises metal particles;

wherein the metal particles comprise at least one species selected from the group consisting of silver particles, copper particles, silver oxide particles, and copper oxide particles;

wherein the metal particles are present in an amount that is 50 wt % to 98 wt % per 100 wt % of the pre-sintering layer;

wherein the metal particles become a sintered body when temperature is increased from 80° C. to 300° C. at a temperature rise rate of 1.5° C./second and is held at 300° C. for 2.5 minutes;

wherein the pre-sintering layer further comprises a binder which is solid at 23° C., wherein the binder comprises acrylic polymer and/or polycarbonate;

wherein the binder is present in an amount that is 0.5 wt % to 20 wt % per 100 wt % of the pre-sintering layer; and

wherein the pre-sintering layer further comprises at least one low-boiling-point binder which has a boiling point between 100° C. and 350° C. selected from the group consisting of monohydric alcohols, polyhydric alcohols, and ethers.

13. A composite sheet comprising:

a release liner; and

the sheet according to claim 12 arranged over the release liner.

14. The sheet according to claim 12 ,

wherein the binder comprises the polycarbonate; and

wherein the polycarbonate is polypropylene carbonate.

15. The sheet according to claim 12 ,

wherein the binder comprises the polycarbonate; and

wherein the polycarbonate has a property such that carbon concentration is not greater than 15 wt % following an increase in temperature from 23° C. to 400° C. at a temperature rise rate of 10° C./min in air.

16. The sheet according to claim 12 , wherein the low-boiling-point binder is at least one compound selected from the group consisting of: pentanol, hexanol, heptanol, octanol, 1-decanol, ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, alpha-terpineol, 1,6-hexanediol, isobornyl cyclohexanol (MTPH), and the ethers.

17. The sheet according to claim 12 , wherein the low-boiling-point binder is isobornyl cyclohexanol (MTPH).

18. The sheet according to claim 12 , wherein the viscosity at 90° C. of the pre-sintering layer is not less than 0.3 MPa·s.

19. The sheet according to claim 12 , wherein the viscosity at 90° C. of the pre-sintering layer is not less than 0.5 MPa·s.

20. The sheet according to claim 1 , wherein the viscosity at 90° C. of the pre-sintering layer is not less than 0.3 MPa·s.

21. The sheet according to claim 1 , wherein the viscosity at 90° C. of the pre-sintering layer is not less than 0.5 MPa·s.