PEELABLE ADHESIVE POLYMERIC FILM
First Claim
Patent Images
1. A method for manufacturing an electronic device comprising:
- (a) heating a laminate comprising (i) a polyester film substrate having a first surface and a second surface, (ii) an adhesive coating derived from an aqueous composition comprising an aliphatic polyurethane and (iii) a glass or silicon wafer substrate, wherein the adhesive coating is disposed between the polyester film substrate and the glass or silicon wafer substrate, to a temperature of at least 150°
C. for a period of at least two minutes; and
(b) peeling the polyester film substrate from the glass or silicon wafer substrate to leave the adhesive coating on the glass or silicon wafer substrate.
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Abstract
Peelable polymeric film, in particular, peelable polymeric film which comprises a polymeric substrate layer and a coating layer of adhesive, and which is of particular use in the manufacture of electronic devices is described. The adhesive layer is derived from an aqueous composition which comprises an aliphatic polyurethane and is switchable.
3 Citations
33 Claims
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1. A method for manufacturing an electronic device comprising:
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(a) heating a laminate comprising (i) a polyester film substrate having a first surface and a second surface, (ii) an adhesive coating derived from an aqueous composition comprising an aliphatic polyurethane and (iii) a glass or silicon wafer substrate, wherein the adhesive coating is disposed between the polyester film substrate and the glass or silicon wafer substrate, to a temperature of at least 150°
C. for a period of at least two minutes; and(b) peeling the polyester film substrate from the glass or silicon wafer substrate to leave the adhesive coating on the glass or silicon wafer substrate. - View Dependent Claims (2, 3, 4, 5, 6, 11, 12, 15, 16, 17, 18, 21, 24, 26, 27, 28)
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- 7. A laminate comprising (i) a polyester film substrate having a first surface and a second surface, (ii) an adhesive coating derived from an aqueous composition comprising an aliphatic polyurethane, and (iii) a glass or silicon wafer substrate, wherein the adhesive coating is disposed between the polyester film substrate and the glass or silicon wafer substrate, wherein there is a change in the plane of failure of the adhesive coating after heating, to a temperature of at least 150°
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9. (canceled)
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10. (canceled)
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13. A polyester film comprising a polyester film substrate and an adhesive coating, wherein the adhesive coating is derived from an aqueous composition comprising an aliphatic polyurethane and wherein the change in the glass transition temperature at onset (Δ
- Tg (onset)) of the adhesive coating after heating to 150°
C. for two minutes, is no more than about 15°
C. as measured by modulated differential scanning calorimetry (DSC), and preferably wherein the adhesive coating exhibits a CO2 peak relative intensity of less than 0.2, and preferably no more than 0.1, and preferably substantially, zero, wherein CO2 peak relative intensity is defined as the intensity of the CO2 asymmetric stretching absorption in the region of 2200 to 2400 cm−
1 of the infrared spectrum as measured by FTIR-TGA analysis at 18 minutes during a temperature cycle which consists of heating the adhesive coating at 10°
C./min from 40°
C. to an isothermal hold at 200°
C. for 5 minutes, relative to the intensity of the same CO2 asymmetric stretching absorption of atmospheric air in the same temperature cycle, and/or wherein the adhesive coating evolves no more than 31, preferably no more than 30, preferably no more than 29, and preferably no more than 28 μ
g of CO2 per 25 mg of the adhesive coating as measured by FTIR-TGA analysis of the CO2 asymmetric stretching absorption in the infrared spectrum at 18 minutes during a temperature cycle which consists of heating the adhesive coating at 10°
C./min from 40°
C. to an isothermal hold at 180°
C. for 5 minutes.
- Tg (onset)) of the adhesive coating after heating to 150°
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14. A polyester film comprising a polyester film substrate and an adhesive coating, wherein the adhesive coating is derived from an aqueous composition comprising an aliphatic polyurethane and wherein the adhesive coating exhibits a CO2 peak relative intensity of less than 0.2, and preferably no more than 0.1, and preferably substantially zero, wherein CO2 peak relative intensity is, defined as the intensity of the CO2 asymmetric stretching absorption in the region of 2200 to 2400 cm−
- 1 of the infrared spectrum as measured by FTIR-TGA analysis at 18 minutes during a temperature cycle which consists of heating the adhesive coating at 10°
C./min from 40°
C. to an isothermal hold at 200°
C. for 5 minutes, relative to the intensity of the same CO2 asymmetric stretching absorption of atmospheric air in the same temperature cycle, and/or wherein the adhesive coating preferably evolves no more than 31, preferably no more than 30, preferably no more than 29, and preferably no more than 28 μ
g of CO2 per 25 mg of the adhesive coating as measured by FTIR-TGA analysis of the CO2 asymmetric stretching absorption in the infrared spectrum at 18 minutes during a temperature cycle which consists of heating the adhesive coating at 10°
C./min from 40°
C. to an isothermal hold at 180°
C. for 5 minutes.
- 1 of the infrared spectrum as measured by FTIR-TGA analysis at 18 minutes during a temperature cycle which consists of heating the adhesive coating at 10°
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19. (canceled)
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20. (canceled)
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22. (canceled)
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23. (canceled)
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25. (canceled)
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29. (canceled)
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30. (canceled)
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31. (canceled)
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32. (canceled)
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33. (canceled)
Specification