US2011159266A1PendingUtilityA1

Epoxy compositions and surfacing films therefrom

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Assignee: 3M INNOVATIVE PROPERTIES COPriority: Dec 29, 2009Filed: Dec 22, 2010Published: Jun 30, 2011
Est. expiryDec 29, 2029(~3.4 yrs left)· nominal 20-yr term from priority
Inventors:Scott A. BoydDmitriy SalnikovDavid T. Amos
C08L 79/00C08L 63/00C08G 59/4042C08G 59/4021C08J 2363/00C08J 5/24C08L 2666/20C08L 2203/16C08L 2205/02C08J 5/18
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Claims

Abstract

A composition is provided comprising: a) a curable epoxy resin; and b) 0.01-30% by weight of a polycarbodiimide according to Formula I: wherein n is an integer between 0 and 100, and wherein each R is independently selected from aromatic and aliphatic groups which contain between 1 and 24 carbons and which are optionally substituted, typically comprising 0.1-20% by weight of the polycarbodiimide. In some embodiments the present disclosure provides sheet materials made of such cured, uncured or partially cured materials. In some embodiments these compositions may be useful in making surfacing films for composite parts and may demonstrate good paint stripper resistance and microcrack resistance.

Claims

exact text as granted — not AI-modified
1 . A composition comprising:
 a) a curable epoxy resin; and   b) 0.01-30% by weight of a polycarbodiimide according to Formula I:   
       
         
           
           
               
               
           
         
       
       wherein n is an integer between 0 and 100, and 
       wherein each R is independently selected from aromatic and aliphatic groups which contain between 1 and 24 carbons and which are optionally substituted. 
     
     
         2 . The composition according to  claim 1  comprising 0.1-20% by weight of said polycarbodiimide. 
     
     
         3 . The composition according to  claim 1  comprising 0.1-10% by weight of said polycarbodiimide. 
     
     
         4 . The composition according to  claim 1  comprising 0.5-5% by weight of said polycarbodiimide. 
     
     
         5 . The composition according to  claim 1  comprising 1-3% by weight of said polycarbodiimide. 
     
     
         6 . The composition according to  claim 1  wherein n is at least 1. 
     
     
         7 . The composition according to  claim 1  wherein n is at least 2. 
     
     
         8 . The composition according to  claim 1  wherein R contains between 3 and 12 carbons. 
     
     
         9 . The composition according to  claim 1  wherein all R groups are aromatic. 
     
     
         10 . The composition according to  claim 1  wherein all R groups are selected from the group consisting of phenyl, toluoyl, phenylene and methyl-phenylene. 
     
     
         11 . The composition according to  claim 1  which is partially cured. 
     
     
         12 . A cured composition obtained by curing the composition according to  claim 1 . 
     
     
         13 . A composite part comprising the cured composition of  claim 12 . 
     
     
         14 . A composite part having an outermost surface comprising the cured composition of  claim 12 . 
     
     
         15 . The composition according to  claim 1  which is a sheet having a thickness of less than 0.5 mm. 
     
     
         16 . The composition according to  claim 11  which is a sheet having a thickness of less than 0.5 mm. 
     
     
         17 . The composition according to  claim 1  which is a solution or suspension in solvent.

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