US2006263608A1PendingUtilityA1

Glass/polyvinylbutyral laminates having directional surface patterns and a process for preparing same

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Individually held — no corporate assignee on recordPriority: Aug 14, 2002Filed: Jan 20, 2006Published: Nov 23, 2006
Est. expiryAug 14, 2022(expired)· nominal 20-yr term from priority
Inventors:Chul Won ChoiSang Gyu Lee
B29C 48/08B32B 2605/08B32B 2307/538Y10T428/24355B32B 17/10761B32B 27/30B32B 2250/03B32B 2605/006B32B 3/26B32B 17/10577B32B 27/42C08K 5/103B32B 2250/40
42
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Claims

Abstract

De-airing of PVB/glass laminates can be improved, while haze in the pre-press is minimized and sleep time reduced as a result using a PVB sheet having a roughened surface with directionality. A roughened surface with a washboard pattern that is useful in this regard can be obtained by varying certain conditions of a melt-fracture extrusion process.

Claims

exact text as granted — not AI-modified
1 . A polyvinyl butyral (PVB) sheet having a roughened directional surface pattern having substantially uninterrupted channels in the cross-web direction, wherein the directional pattern is created using a melt fracture extrusion process without the use of an embossing tool.  
   
   
       2 . The sheet of  claim 1  having a washboard surface pattern.  
   
   
       3 . The sheet of  claim 2  having an R z  of greater than about 30.  
   
   
       4 . The sheet of  claim 3  having an R z  of greater than 35.  
   
   
       5 . The sheet of  claim 4  having an R z  of greater than about 40.  
   
   
       6 . The sheet of  claim 5  having an R z  of from about 35 to about 100.  
   
   
       7 . A polyvinyl butyral sheet having a herringbone surface pattern created using a melt fracture extrusion process without the use of an embossing tool.  
   
   
       8 . The sheet of  claim 7  having an R z  of less than about 35.  
   
   
       9 . The sheet of  claim 8  having an R z  of less than about 30.  
   
   
       10 . The sheet of  claim 7  having an R z  of from about 15 to about 35.  
   
   
       11 . The sheet of  claim 10  having an R z  of from about 20 to about 30.  
   
   
       12 . A process for creating a directional pattern on a surface of a polyvinyl butyral sheet comprising the step: extruding molten PVB using a melt fracture extrusion process, wherein the pattern can be varied by varying the extrusion process parameters and wherein an embossing tool is not used.  
   
   
       13 . The process of  claim 12  wherein a washboard pattern is created using a die pressure of greater than about 58 kg/cm 2 .  
   
   
       14 . The process of  claim 12  wherein a herringbone pattern is created using a die pressure of less than about 37 kg/cm 2 .  
   
   
       15 . A laminate comprising a polyvinyl butyral interlayer, wherein the interlayer is obtained from a polyvinyl butyral sheet having a roughened directional surface pattern created by extrusion of the sheet using a melt fracture process.  
   
   
       16 . The laminate of  claim 15  wherein the directional surface pattern on the PVB is a washboard pattern obtained using a die pressure of greater than about 58 kg/cm 2 .  
   
   
       17 . The laminate of  claim 15  wherein the directional surface pattern of the PVB sheet is a herringbone pattern obtained using a die pressure of less than about 37 kg/cm 2 .  
   
   
       18 . The laminate of  claim 15  wherein at least one layer is glass adhered to the PVB layer.  
   
   
       19 . The laminate of  claim 18  wherein the PVB is adhered to at least two layers of glass.  
   
   
       20 . The laminate of  claim 15  wherein at least one layer of an additional polymer is included in addition to the PVB.  
   
   
       21 . An article obtained from a laminate of  claim 15 .  
   
   
       22 . The article of  claim 21  wherein the article is a windshield, or automotive side-glass.  
   
   
       23 . The article of  claim 21  wherein the article is a window, shelf, or architectural glass.  
   
   
       24 . The process of  claim 13  wherein the lip steam pressure is below about 10 kg/cm 2  (9.8 MPa).  
   
   
       25 . The process of  claim 14  wherein the lip steam pressure is below 15 kg/cm 2  (9.8 MPa).

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