Method for releasing adhered article

• US 7,909,959 B2
• Filed: 04/14/2004
• Issued: 03/22/2011
• Est. Priority Date: 04/14/2003
• Status: Active Grant

• Current Assignee: Sekisui Chemical Company Limited (Sekisui)
• Original Assignee: Sekisui Chemical Company Limited (Sekisui)
• Inventors: Yoshioka, Tadahiko, Toyoshima, Katsunori, Fukatani, Juichi, Nishimura, Yohei, Tada, Toshio
• Primary Examiner(s): Osele; Mark A
• Assistant Examiner(s): HARM, NICKOLAS R
• Application Number:
  US10/553,177
• Publication Number:
  US 20060144515A1
• Time in Patent Office: 2,533 Days
• Field of Search: None
• US Class Current: 156/706
• CPC Class Codes: B32B 17/1099 After-treatment of the layered product, e.g. cooling
• CPC Class Codes: B32B 43/006 Delaminating
• CPC Class Codes: C08J 11/04 of polymers
• CPC Class Codes: C09J 2301/502 process for debonding adherents
• CPC Class Codes: C09J 5/00 Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
• CPC Class Codes: H01L 21/6835 using temporarily an auxiliary support
• CPC Class Codes: H01L 21/6836 Wafer tapes, e.g. grinding or dicing support tapes adhesive tapes in general C09J7/20
• CPC Class Codes: H01L 2221/68318 Auxiliary support including means facilitating the separation of a device or wafer from the auxiliary support
• CPC Class Codes: H01L 2221/68327 used during dicing or grinding
• CPC Class Codes: H01L 2224/81052 Detaching bump connectors, e.g. after testing unsoldering in general B23K1/018
• CPC Class Codes: H01L 2224/81801 Soldering or alloying
• CPC Class Codes: H01L 2924/01019 Potassium [K]
• CPC Class Codes: H01L 2924/09701 Low temperature co-fired ceramic [LTCC]
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• CPC Class Codes: Y02P 20/143 the feedstock being recycled material, e.g. plastics
• CPC Class Codes: Y02W 30/62 Plastics recycling; Rubber recycling
• CPC Class Codes: Y10T 156/11 Methods of delaminating, per se; i.e. , separating at bonding face
• CPC Class Codes: Y10T 156/1126 Using direct fluid current against work during delaminating
• CPC Class Codes: Y10T 156/1137 Using air blast directly against work during delaminating
• CPC Class Codes: Y10T 156/1153 Temperature change for delamination [e.g., heating during delaminating, etc.]
• CPC Class Codes: Y10T 156/1928 : Differential fluid pressure delaminating means

Abstract

It is an object of the invention to provide a separation method of an adherend capable of easily and reliably separating an adherend stuck using an adhesive, a method for recovering an electronic part from an electronic part laminate, and a separation method of laminate glass.

The invention provides a separation method of an adherend, which is a method of separating an adherend stuck by using an adhesive, and comprises the steps of: air-tightly sealing the adherend together with a fluid being a gas at a normal temperature and normal pressure in a pressure resistant container, making the inside of the pressure resistant container in a high pressure state, and releasing the pressure of the inside of the pressure resistant container.

Claims

1. A separation method of an adherend, which is a method of separating an adherend stuck by using an adhesive, wherein the adhesive comprises as an adhesive component polyvinyl acetal resins, and comprises the steps of:

air-tightly sealing the adherend together with at least one substance selected from the group consisting of air, carbon dioxide, nitrogen, oxygen, methane, ethane, propane, and butane in a pressure resistant container, making the inside of the pressure resistant container in a high pressure state of 5 MPa or higher, and releasing the pressure of the inside of the pressure resistant container, and wherein water is further sealed in the pressure resistant container in the step of air-tightly sealing the adherend together with said at least one substance in the pressure resistant container, whereby the polyvinyl acetal resins are not dissolved.

2. The separation method of an adherend according to claim 1, wherein the at least one substance contains at least carbon dioxide.

3. The separation method of an adherend according to claim 2, wherein a release agent is further sealed in the step of air-tightly sealing the adherend together with the at least one substance in the pressure resistant container.

4. The separation method of an adherend according to claim 1, wherein a release agent is further sealed in the step of air-tightly sealing the adherend together with the at least one substance in the pressure resistant container.

5. The separation method of an adherend according to claim 1, wherein the at least one substance in the inside of the pressure resistant container is adjusted to be in supercritical state or subcritical state in the step of making the inside of the pressure resistant container in a high pressure state.

6. The separation method of an adherend according to claim 1, wherein the inside of the pressure resistant container is adjusted to be a temperature higher than a temperature 20°

C. lower than a glass transition temperature of a resin composing the adhesive in the step of making the inside of the pressure resistant container in a high pressure state.

7. The separation method of an adherend according to claim 1, wherein the inside of the pressure resistant container is adjusted to be a temperature higher than a temperature 10°

C. lower than a glass transition temperature of a resin composing the adhesive in the step of making the inside of the pressure resistant container in a high pressure state.

8. A method of recovering an electronic part from an electronic part laminate, which is a method of recovering an electronic part from an electronic part laminate stuck by an adhesive, wherein the adhesive comprises as an adhesive component polyvinyl acetal resins, and comprises the steps of:

air-tightly sealing the electronic part laminate together with at least one substance selected from the group consisting of air, carbon dioxide, nitrogen, oxygen, methane, ethane, propane, and butane in a pressure resistant container;

making the inside of the pressure resistant container in a high pressure state of 5 MPa or higher; and

releasing the pressure of the inside of the pressure resistant container, and wherein water is further sealed in the pressure resistant container in the step of air-tightly sealing the adherend together with said at least one substance in the pressure resistant container.

9. The separation method of an adherend according to claim 8, wherein the at least one substance contains at least carbon dioxide.

10. The separation method of an adherend according to claim 8, wherein the inside of the pressure resistant container is adjusted to be a temperature higher than a temperature 10°

C. lower than a glass transition temperature of a resin composing the adhesive in the step of making the inside of the pressure resistant container in a high pressure state.

11. The separation method of an adherend according to claim 8, wherein the at least one substance in the inside of the pressure resistant container is adjusted to be in supercritical state or subcritical state in the step of making the inside of the pressure resistant container in a high pressure state.

12. A method for separating a laminate glass, which is a method for separating a laminate glass obtained by sticking a plurality of glass sheets with an adhesive or an interlayer film for the laminate glass into glass sheets and either the adhesive or an interlayer film for laminate glass, wherein the adhesive or interlayer film comprises as an adhesive component polyvinyl acetal resins, and comprises the steps of:

air-tightly sealing the laminate glass together with at least one substance selected from the group consisting of air, carbon dioxide, nitrogen, oxygen, methane, ethane, propane, and butane in a pressure resistant container of 5 MPa or higher;

making the inside of the pressure resistant container in a high pressure state; and

releasing the pressure of the inside of the pressure resistant container, and wherein water is further sealed in the pressure resistant container in the step of air-tightly sealing the adherend together with said at least one substance in the pressure resistant container.

13. A recovery method of indium-doped tin oxide fine particles from a laminate glass, which comprises the step of:

firing an interlayer film for laminate glass recovered by the separation method of laminate glass according to claim 12.

14. The separation method of an adherend according to claim 12, wherein the at least one substance contains at least carbon dioxide.

15. The separation method of an adherend according to claim 12, wherein the inside of the pressure resistant container is adjusted to be a temperature higher than a temperature 10°

C. lower than a glass transition temperature of a resin composing the adhesive in the step of making the inside of the pressure resistant container in a high pressure state.

16. The separation method of an adherend according to claim 12, wherein the at least one substance in the inside of the pressure resistant container is adjusted to be in supercritical state or subcritical state in the step of making the inside of the pressure resistant container in a high pressure state.