TOUCH PANEL

• US 20120135241A1
• Filed: 02/03/2012
• Published: 05/31/2012
• Est. Priority Date: 08/05/2009
• Status: Abandoned Application

• Current Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Yasuda, Teruhiko, Shimoma, Hitoshi, Enna, Genichirou
• Application Number:
  US13/365,599
• Publication Number:
  US 20120135241A1
• Time in Patent Office: Days
• US Class Current: 428/412
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C08G 77/445 containing polyester sequences
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31598 Next to silicon-containing [silicone, cement, etc.] layer
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

To provide a touch panel having a surface protective film laminated on a touch pad via an adherence substance layer having a low adhesive strength and excellent removability, having a good holding power, and having an adhesive strength with a small increase with time.

A touch panel comprising a display module 1, a touch pad 2 laminated on a display screen of the display module 1 and a surface protective film 3 laminated on the viewer side of the touch pad 2, wherein between the surface protective film 3 and the touch pad 2, a first adherence substance layer 11 obtained by curing a first curable composition containing a silyl group-containing polymer (S) is interposed. The silyl group-containing polymer (S) is a polymer having a polyether chain, a polyester chain and/or a polycarbonate chain in its main chain and having a hydrolyzable silyl group at its molecular terminal.

Claims

1. A touch panel comprising a display module, a touch pad laminated on a display screen of the display module and a surface protective film laminated on the viewer side of the touch pad, wherein between the surface protective film and the touch pad, a first adherence substance layer obtained by curing a first curable composition containing the flowing silyl group-containing polymer (S) is interposed:

silyl group-containing polymer (S);

a silyl group-containing polymer having a polyether chain, a polyester chain and/or a polycarbonate chain in its main chain and having a hydrolyzable silyl group at its molecular terminal.

2. The touch panel according to claim 1, wherein the silyl group-containing polymer (S) in the first curable composition contains the following silyl group-containing polymer (S1):

silyl group-containing polymer (S1);

a silyl group-containing polymer obtained by introducing a hydrolyzable silyl group to a terminal of at least one polyol compound selected from the group consisting of a polyether polyol, a polyester polyol, a polycarbonate polyol and a polyether polyester polyol.

3. The touch panel according to claim 1, wherein between the display module and the touch pad, a second adherence substance layer obtained by curing a second curable composition containing the above silyl group-containing polymer (S) is interposed.

4. The touch panel according to claim 3, wherein the silyl group-containing polymer (S) in the second curable composition contains the above silyl group-containing polymer (S1), or the following silyl group-containing polymer (S2) or (S3):

silyl group-containing polymer (S2);

a silyl group-containing polymer obtained by introducing a hydrolyzable silyl group to a terminal of a polyurethane prepolymer obtained by reacting at least one polyol compound selected from the group consisting of a polyether polyol, a polyester polyol, a polycarbonate polyol and a polyether polyester polyol with a polyisocyanate compound;

silyl group-containing polymer (S3);

a silyl group-containing polymer obtained by introducing a hydrolyzable silyl group to a molecular terminal of a polyurethane polymer obtained by reacting at least one polyol compound selected from the group consisting of a polyether polyol, a polyester polyol, a polycarbonate polyol and a polyether polyester polyol with a polyisocyanate compound to obtain a polyurethane prepolymer, and further subjecting the polyurethane prepolymer to a chain extending reaction by a chain extending agent.

5. The touch panel according to claim 1, wherein the hydrolyzable silyl group is introduced by using at least one silane compound selected from the group consisting of an isocyanate silane, an aminosilane, a mercaptosilane, an epoxysilane and a hydrosilane.

6. The touch panel according to claim 1, wherein the hydrolyzable silyl group is a trialkoxysilyl group.

7. The touch panel according to claim 1, wherein each of the first adherence substance layer and the second adherence substance layer has a peel adhesive strength of at most 8 N/25 mm.

8. The touch panel according to claim 1, wherein the first curable composition contains a curing catalyst, and the first curable composition is cured in an atmosphere containing moisture.