Composite glass pane with a border seal and method for producing same

Abstract

A composite glass pane having a first glass pane, a second glass pane, and an intermediate layer arranged between the first and second glass panes is described. The intermediate layer includes one cover layer based on a thermoplastic polymer, and a border seal. The first glass pane is arranged with an offset relative to the second glass pane, the intermediate layer is cut back along at least one edge of the composite glass pane by a border distance, and the border seal is arranged in a border gap delimited by the first glass pane, the second glass pane and the intermediate layer. The border seal contains a polymer fusible with a polymer of the cover layers.

1 .- 15 . (canceled) 
     
     
         16 . A composite glass pane comprising:
 a first glass pane;   a second glass pane; and   an intermediate layer arranged between the first glass pane and the second glass pane, the intermediate layer comprising at least one first cover layer based on at least one thermoplastic polymer, and a border seal,   wherein the first glass pane is arranged with an offset relative to the second glass pane,   wherein the intermediate layer is cut back along at least one edge of the composite glass pane by a border distance,   wherein the border seal is arranged in a border gap delimited by the first glass pane, the second glass pane, and the intermediate layer, and   wherein the border seal contains a polymer fusible with the polymer of the at least one first cover layer.   
     
     
         17 . The composite glass pane according to  claim 16 , wherein the offset relative to the second glass pane is 0.01 mm to 3 mm. 
     
     
         18 . The composite glass pane according to  claim 16 , wherein the offset relative to the second glass pane is 0.1 mm to 1 mm. 
     
     
         19 . The composite glass pane according to  claim 16 , wherein the border distance is 1 mm to 10 mm. 
     
     
         20 . The composite glass pane according to  claim 16 , wherein the composite glass pane has along the at least one edge a thickness variation smaller than, or equal to, 0.5 mm. 
     
     
         21 . The composite glass pane according to  claim 16 , wherein the composite glass pane has along the at least one edge a thickness variation in a range of 0.02 mm to 0.1 mm. 
     
     
         22 . The composite glass pane according to  claim 16 , wherein the at least one first cover layer contains thermoplastic polyvinyl butyral, and wherein the border seal contains a melt of the thermoplastic polyvinyl butyral. 
     
     
         23 . The composite glass pane according to  claim 16 , wherein the border seal contains a melt of the thermoplastic polymer. 
     
     
         24 . The composite glass pane according to  claim 23 , further comprising an adhesion promoter added to the thermoplastic polymer. 
     
     
         25 . The composite glass pane according to  claim 16 , wherein the intermediate layer further comprises a carrier film, a corrosion-sensitive functional layer arranged thereon, and a second cover layer. 
     
     
         26 . The composite glass pane according to  claim 16 , wherein a top edge of the border seal has an angle of inclination from a pane edge of the first glass pane to a pane edge of the second glass pane. 
     
     
         27 . A method for producing the composite glass pane of  claim 16 , the method comprising:
 a) producing a pre-laminate composed of the first and second glass panes;   b) producing the intermediate layer;   c) based on the producing, forming the border gap;   d) injecting a melt of a thermoplastic polymer fusible with the cover layer into the border gap with an extrusion die, wherein an opening of the extrusion die is positioned between a first roller and a second roller directly in front of the border gap so that:
 the first roller rests against the pane edge of the first glass pane and the second roller rests against the pane edge of the second glass pane, wherein the first roller and the second roller are displaceable parallel to the surface of the glass panes to compensate for the offset, and 
 the pre-laminate rests with a pane surface on a third roller, which is displaceable perpendicular to the surface of the glass panes, 
   e) based on the injecting, forming the border seal;   f) bonding the first glass pane, the second glass pane and the intermediate layer by supplying of heat and application of pressure; and   g) based on the bonding, forming the composite glass pane, and fusing the polymer injected into the border gap with the polymer of the cover layer.   
     
     
         28 . The method according to  claim 27 , further comprising:
 removing a portion of the border seal protruding on the edges of the composite glass pane obtained in step f).   
     
     
         29 . The method according to  claim 27 , wherein the opening of the extrusion die is substantially rectangular or oval. 
     
     
         30 . The method according to  claim 29 , wherein the opening of the extrusion die has a width of 1.5 mm to 3 mm and a height of 0.5 mm to 0.7 mm. 
     
     
         31 . The method according to  claim 27 , wherein in step d), the pre-laminate is guided past the extrusion die. 
     
     
         32 . The method according to  claim 27 , wherein in step d), the extrusion die is guided past the border gap by a remote-controlled robot. 
     
     
         33 . The method according to  claim 27 , wherein in step d), the pre-laminate is heated to 35° C. to 100° C. 
     
     
         34 . The method according to  claim 27 , wherein in step d), the pre-laminate is heated to 40° C. to 80° C. 
     
     
         35 . A method, comprising:
 using the composite glass pane according to  claim 16  as a freestanding pane, or as a freestanding motor vehicle side window pane.