Glass substrate with protective glass, process for producing display device using glass substrate with protective glass, and silicone for release paper

Abstract

To provide a glass substrate with protective glass which suppresses formation of microscopic scratches on the back surface of the glass substrate in the production process for a display device, and which prevents a strength decrease in the process or formation of etch pits after a chemical etching treatment; a process for producing a display device by using the glass substrate with protective glass; and silicone for release paper for the glass substrate with protective glass. A glass substrate with protective glass, which comprises a glass substrate and a protective glass substrate laminated on each other, and which is characterized in that the glass substrate and the protective glass substrate are laminated by a resin layer having removability.

1 . A glass substrate with protective glass, which comprises a glass substrate and a protective glass substrate laminated on each other, and which is characterized in that the glass substrate and the protective glass substrate are laminated by a resin layer having removability. 
   
   
       2 . The glass substrate with protective glass according to  claim 1 , wherein the resin layer having removability is fixed on a surface of the protective glass substrate. 
   
   
       3 . The glass substrate with protective glass according to  claim 1 , wherein the resin layer having removability is an acrylic resin layer, a polyolefin resin layer, a polyurethane resin layer or a silicone resin layer. 
   
   
       4 . The glass substrate with protective glass according to  claim 3 , wherein the silicone resin layer is a silicone resin layer having releasability and non-adhesive property, or a silicone resin layer having releasability and slight adhesive property. 
   
   
       5 . The glass substrate with protective glass according to  claim 4 , wherein the silicone resin layer having releasability and non-adhesive property, or the silicone resin layer having releasability and slight adhesive property, further has low silicone migration property. 
   
   
       6 . The glass substrate with a protective glass according to  claim 4 , wherein the silicone resin layer having releasability and non-adhesive property, or the silicone resin layer having releasability and slight adhesive property, is a layer made of a cured product of silicone for release paper. 
   
   
       7 . The glass substrate with protective glass according to  claim 6 , wherein the cured product of silicone for release paper, is a crosslinked product of a linear polyorganosiloxane having vinyl groups at both terminals and/or in its side chain, and a methylhydrogen polysiloxane having hydrosilyl groups in its molecule. 
   
   
       8 . The glass substrate with protective glass according to  claim 7 , wherein before curing, the cured product of silicone for release paper has a molar ratio of hydrosilyl groups of the methylhydrogen polysiloxane to vinyl groups of the linear polyorganosiloxane being from 1.3/1 to 0.7/1. 
   
   
       9 . The glass substrate with protective glass according to  claim 1 , wherein the thickness of the glass substrate is less than 1.0 mm, and the total thickness of the protective glass substrate and the resin layer having removability is at least 0.1 mm. 
   
   
       10 . The glass substrate with protective glass according to  claim 1 , wherein the difference between the linear expansion coefficient of the glass substrate and the linear expansion coefficient of the protective glass substrate is at most 15×10 −7 /° C. 
   
   
       11 . A process for producing a display device by using a glass substrate with protective glass, which comprises a step of forming a resin layer having removability on a protective glass substrate, a step of laminating a glass substrate on the resin layer-formed surface of the protective glass substrate, a step of carrying out a prescribed treatment for producing a display device on the glass substrate, and a step of separating the glass substrate from the protective glass substrate. 
   
   
       12 . The process for producing a display device by using a glass substrate with protective glass according to  claim 11 , wherein the resin layer having removability is an acrylic resin layer, a polyolefin resin layer, a polyurethane resin layer or a silicone resin layer. 
   
   
       13 . The process for producing a display device by using a glass substrate with protective glass according to  claim 12 , wherein the silicone resin layer is a silicone resin layer having releasability and non-adhesive property, or a silicone resin layer having releasability and slight adhesive property. 
   
   
       14 . The process for producing a display device by using a glass substrate with protective glass according to  claim 13 , wherein the silicone resin layer having releasability and non-adhesive property, or the silicone resin layer having releasability and slight adhesive property, is a layer made of a cured product of silicone for release paper. 
   
   
       15 . The process for producing a display device by using a glass substrate with protective glass according to claim  14 , wherein the cured product of silicone for release paper, is a crosslinked product of a linear polyorganosiloxane having vinyl groups at both terminals and/or in its side chain, and a methylhydrogen polysiloxane having hydrosilyl groups in its molecule. 
   
   
       16 . The process for producing a display device by using a glass substrate with protective glass according to  claim 15 , wherein before curing, the cured product of silicone for release paper has a molar ratio of hydrosilyl groups of the methylhydrogen polysiloxane to vinyl groups of the linear polyorganosiloxane being from 1.3/1 to 0.7/1. 
   
   
       17 . The process for producing a display device by using a glass substrate with protective glass according to  claim 11 , wherein the step of forming a resin layer having removability on the protective glass substrate, includes applying silicone for release paper on the protective glass substrate, followed by curing the silicone for release paper. 
   
   
       18 . The process for producing a display device by using a glass substrate with protective glass according to  claim 17 , wherein the silicone for release paper contains a linear polyorganosiloxane having vinyl groups at both terminals and/or in its side chain, a methylhydrogen polysiloxane having hydrosilyl groups in its molecule, and a platinum catalyst. 
   
   
       19 . The process for producing a display device by using a glass substrate with protective glass according to claim  18 , wherein in the silicone for release paper, the molar ratio of hydrosilyl groups of the methylhydrogen polysiloxane to vinyl groups of the linear polyorganosiloxane is from 1.3/1 to 0.7/1. 
   
   
       20 . The process for producing a display device by using a glass substrate with protective glass according to  claim 17 , wherein the silicone for release paper contains substantially no non-reactive silicone. 
   
   
       21 . The process for producing a display device by using a glass substrate with protective glass according to  claim 17 , wherein application of the silicone for release paper is carried out by a die coating method, a spin coating method or a screen printing method. 
   
   
       22 . The process for producing a display device by using a glass substrate with protective glass according to  claim 17 , wherein the silicone for release paper is heat-cured at a temperature of from 50 to 250° C. 
   
   
       23 . The process for producing a display device by using a glass substrate with protective glass according to  claim 11 , wherein the step of laminating a glass substrate on the resin layer-formed surface of the protective glass substrate, is carried out by using vacuum pressing or vacuum lamination. 
   
   
       24 . Silicone for release paper for a glass substrate with protective glass, which is to be used for laminating the glass substrate and the protective glass substrate. 
   
   
       25 . The silicone for release paper according to  claim 24 , which contains a linear polyorganosiloxane having vinyl groups at both terminals and/or in its side chain, a methylhydrogen polysiloxane having hydrosilyl groups in its molecule, and a platinum catalyst. 
   
   
       26 . The silicone for release paper according to  claim 25 , wherein the molar ratio of hydrosilyl groups of the methylhydrogen polysiloxane to vinyl groups of the linear polyorganosiloxane is from 1.3/1 to 0.7/1.