Curable coatings having low permeable to silfur-bearing gases

Abstract

Siloxane cross-linked polyolefins provide for a composition that is more or less impermeable to gaseous sulfur compounds such as hydrogen sulfide providing for a protective coating for various articles of manufacture especially electronic components and a method of protecting various articles of manufacture from the effects of such gaseous sulfur compounds.

1 . A coating comprising a polymeric composition comprising the reaction product of: 
 a) a telechelic polyolefin and    b) a siloxane    whereby the diffusion rate of hydrogen sulfide gas through a membrane comprising said composition having a thickness ranging from about 10 to about 30 mil at 50° C. is below about 0.0010 grams of hydrogen sulfide per square meter of membrane per day.    
     
     
         2 . The coating of  claim 1  wherein said diffusion rate is below about 0.0005 grams of hydrogen sulfide per square meter of membrane per day.  
     
     
         3 . The coating of  claim 1  wherein said diffusion rate is below about 0.0003 grams of hydrogen sulfide per square meter of membrane per day.  
     
     
         4 . A coating comprising a polymeric composition comprising the reaction product of: 
 a) a telechelic polyolefin and    b) a siloxane    whereby the diffusion rate of methyl mercaptan gas through a membrane comprising said composition having a thickness ranging from about 10 to about 30 mil at 50° C. is below about 0.0010 grams of methyl mercaptan per square meter of membrane per day.    
     
     
         5 . The coating composition of  claim 4  wherein said diffusion rate is below about 0.0005 grams of methyl mercaptan per square meter of membrane per day.  
     
     
         6 . The coating composition of  claim 1  wherein said polyolefin is polyisobutylene.  
     
     
         7 . The coating composition of  claim 1  wherein said polyolefin is polypropylene.  
     
     
         8 . (canceled)  
     
     
         9 . The coating composition of  claim 6  wherein said diffusion rate is below about 0.0005 grams of hydrogen sulfide per square meter of membrane per day.  
     
     
         10 . The coating composition of  claim 6  wherein said diffusion rate is below about 0.0003 grams of hydrogen sulfide per square meter of membrane per day.  
     
     
         11 . A coated article comprising a coating comprising a polymeric composition comprising the reaction product of: 
 a) a telechelic polyolefin and    b) a siloxane    whereby the diffusion rate of hydrogen sulfide gas through a membrane comprising said composition having a thickness ranging from about 10 to about 30 mil at 50° C. is below about 0.0010 grams of hydrogen sulfide per square meter of membrane per day.    
     
     
         12 . The article of  claim 11  wherein said diffusion rate is below about 0.0005 grams of hydrogen sulfide per square meter of membrane per day.  
     
     
         13 . The article of  claim 11  wherein said diffusion rate is below about 0.0003 grams of hydrogen sulfide per square meter of membrane per day.  
     
     
         14 . The coated article comprising a polymeric composition comprising the reaction product of: 
 a) a telechelic polyolefin and 
 b) a siloxane  
 whereby the diffusion rate of methyl mercaptan gas through a membrane comprising said composition having a thickness ranging from about 10 to about 30 mil at 50° C. is below about 0.0010 grams of methyl mercaptan per square meter of membrane per day.  
   
     
     
         15 . The article comprising the composition of  claim 14  wherein said diffusion rate is below about 0.0005 grams of methyl mercaptan per square meter of membrane per day.  
     
     
         16 . The article comprising the composition of  claim 10  wherein said polyolefin is polisobutylene.  
     
     
         17 . The article comprising the composition of  claim 10  wherein said polyolefin is polypropylene.  
     
     
         18 . (canceled)  
     
     
         19 . The article comprising the composition of  claim 16  wherein said diffusion rate is below about 0.0005 grams of hydrogen sulfide per square meter of membrane per day.  
     
     
         20 . The article comprising the composition of  claim 16  wherein said diffusion rate is below about 0.0003 grams of hydrogen sulfide per square meter of membrane per day.  
     
     
         21 . A method for protecting an article from hydrogen sulfide comprising: 
 a) preparing a coating composition from a polymeric composition comprising the reaction product of: 
 1) a telechelic polyolefin and  
 2) a siloxane  
 whereby the diffusion rate of hydrogen sulfide gas through a membrane comprising said composition having a thickness ranging from about 10 to about 30 mil at 50° C. is below about 0.0010 grams of hydrogen sulfide per square meter of membrane per day and  
   b) applying said coating composition to said article.    
     
     
         22 . The method of  claim 21  wherein said polyolefin is polyisobutylene.  
     
     
         23 . A method for protecting an article from methyl mercaptan comprising: 
 a) preparing a coating composition from a polymeric composition comprising the reaction product of: 
 1) a telechelic polyolefin and  
 2) a siloxane  
 whereby the diffusion rate of methyl mercaptan gas through a membrane comprising said composition having a thickness ranging from about 10 to about 30 mil at 50° C. is below about 0.0010 grams of methyl mercaptan per square meter of membrane per day and  
   b) applying said coating composition to said article.    
     
     
         24 . The method of  claim 23  wherein said polyolefin is polyisobutylene.