US2006216501A1PendingUtilityA1

Polymer interlayers comprising antiblocking layers

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Assignee: SOLUTIA INCPriority: Mar 24, 2005Filed: Mar 24, 2005Published: Sep 28, 2006
Est. expiryMar 24, 2025(expired)· nominal 20-yr term from priority
Inventors:Chiah-Chang Clifford LinPing Yuan
C08L 2666/36C08K 5/20B32B 2607/00B32B 2307/746B32B 2307/558B32B 2307/412B32B 2264/0264B32B 2250/246B32B 2250/24B32B 2250/03B32B 2250/02B32B 27/42B32B 27/30B32B 17/10935B32B 17/1055C08L 29/14B32B 2605/006B32B 2329/06B32B 27/20B32B 27/18B32B 27/08B32B 17/10761B32B 7/12Y10T428/3163Y10T428/31909Y10T428/24942B32B 17/10B32B 27/28Y10T428/269Y10T428/2495Y10T428/31627Y10T428/31946Y10T428/31942Y10T428/24967
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Claims

Abstract

The present invention is in the field of polymer interlayers used in multiple layer glass panels, and specifically the present invention is in the field of antiblocking agents for polymer interlayers and methods of effectively incorporating such agents into interlayers.

Claims

exact text as granted — not AI-modified
1 . An interlayer, comprising: 
 a polymer stack comprising a first polymer sheet, wherein said first polymer sheet is substantially free of antiblocking agent; and,    a second polymer sheet disposed in contact with said polymer stack, wherein said second polymer sheet comprises an antiblocking agent and has a thickness of less than 0.4 millimeters.    
     
     
         2 . The interlayer of  claim 1 , wherein said first polymer sheet and said second polymer sheet each comprise poly(vinyl butyral).  
     
     
         3 . The interlayer of  claim 2 , wherein said second polymer sheet has a thickness of less than 0.3 millimeters.  
     
     
         4 . The interlayer of  claim 2 , wherein said second polymer sheet has a thickness of less than 0.25 millimeters.  
     
     
         5 . The interlayer of  claim 2 , wherein said antiblocking agent is a fatty acid amide with the general formula:  
       
         
           
           
               
               
           
         
       
       wherein R is a hydrocarbon chain having about 12 to about 40 carbon atoms, and R 1  is H or a hydrocarbon chain having 1 to about 40 carbon atoms.  
     
     
         6 . The interlayer of  claim 2 , wherein said polymer stack further comprises a polymer film disposed between said first polymer sheet and said second polymer sheet.  
     
     
         7 . The interlayer of  claim 2 , further comprising a third polymer sheet disposed in contact with said polymer stack opposite said second polymer sheet, wherein said third polymer sheet comprises an antiblocking agent and has a thickness of less than 0.4 millimeters.  
     
     
         8 . The interlayer of  claim 2 , wherein said first polymer sheet does not comprise an antiblocking agent.  
     
     
         9 . An interlayer, comprising: 
 a polymer sheet, wherein said polymer sheet comprises an antiblocking region and a non antiblocking region, wherein said antiblocking region comprises an antiblocking agent and has a thickness of less than 0.4 millimeters, and said non antiblocking region is substantially free of antiblocking agents.    
     
     
         10 . The interlayer of  claim 9 , wherein said antiblocking region and said non antiblocking region each comprise poly(vinyl butyral).  
     
     
         11 . The interlayer of  claim 10 , wherein said antiblocking region has a thickness of less than 0.3 millimeters.  
     
     
         12 . The interlayer of  claim 10 , wherein said non antiblocking region has a thickness of less than 0.125 millimeters.  
     
     
         13 . The interlayer of  claim 10 , wherein said antiblocking agent is a fatty acid amide with the general formula:  
       
         
           
           
               
               
           
         
       
       wherein R is a hydrocarbon chain having about 12 to about 40 carbon atoms, and R 1  is H or a hydrocarbon chain having 1 to about 40 carbon atoms.  
     
     
         14 . The interlayer of  claim 10 , wherein said first antiblocking region does not comprise an antiblocking agent.  
     
     
         15 . The interlayer of  claim 10 , wherein said antiblocking agent comprises N-oleyl palmitamide.  
     
     
         16 . A method for making a polymer sheet, comprising: 
 coextruding a first melt and a second melt to form said polymer sheet, wherein said polymer sheet comprises an antiblocking region formed from said first melt and a non antiblocking region formed from said second melt, wherein said antiblocking region has a thickness of less than 0.4 millimeters, wherein said first melt comprises an antiblocking agent, and wherein said second melt is substantially free of antiblocking agent.    
     
     
         17 . The method of  claim 16 , wherein said first melt and said second melt each comprise poly(vinyl butyral).  
     
     
         18 . The method of  claim 17 , wherein said antiblocking region has a thickness of less than 0.3 millimeters.  
     
     
         19 . The method of  claim 17 , wherein said antiblocking region has a thickness of less than 0.125 millimeters.  
     
     
         20 . The method of  claim 17 , wherein said antiblocking agent is a fatty acid amide with the general formula:  
       
         
           
           
               
               
           
         
       
       wherein R is a hydrocarbon chain having about 12 to about 40 carbon atoms, and R 1  is H or a hydrocarbon chain having 1 to about 40 carbon atoms.  
     
     
         21 . The method of  claim 17 , wherein said second melt does not comprise an antiblocking agent.  
     
     
         22 . The method of  claim 17 , wherein said antiblocking agent comprises N-oleyl palmitamide.  
     
     
         23 . A method for making an interlayer, comprising: 
 providing a polymer stack, wherein said polymer stack comprises a first polymer sheet, wherein said first polymer sheet is substantially free of antiblocking agent;    disposing a second polymer sheet in contact with said polymer stack, wherein said second polymer sheet comprises an antiblocking agent and has a thickness of less than 0.4 millimeters; and,    laminating said polymer stack and said second polymer sheet to form an interlayer.    
     
     
         24 . The method of  claim 23 , wherein said first polymer sheet and said second polymer sheet each comprise poly(vinyl butyral).  
     
     
         25 . The method of  claim 24 , wherein said second polymer sheet has a thickness of less than 0.3 millimeters.  
     
     
         26 . The method of  claim 24 , wherein said second polymer sheet has a thickness of less than 0.2 millimeters.  
     
     
         27 . The method of  claim 24 , wherein said antiblocking agent is a fatty acid amide with the general formula:  
       
         
           
           
               
               
           
         
       
       wherein R is a hydrocarbon chain having about 12 to about 40 carbon atoms, and R 1  is H or a hydrocarbon chain having 1 to about 40 carbon atoms.  
     
     
         28 . The method of  claim 24 , wherein said polymer stack further comprises a polymer film, which is disposed between said first polymer sheet and said second polymer sheet.  
     
     
         29 . The method of  claim 24 , wherein said polymer stack further comprises a third polymer sheet, wherein said third polymer sheet comprises an antiblocking agent and has a thickness of less than 0.4 millimeters.  
     
     
         30 . The method of  claim 24 , wherein said first polymer sheet does not comprise an antiblocking agent.

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