US2004029743A1PendingUtilityA1

Cyclic thioureas as additives for lubricating oils

42
Priority: Aug 7, 2002Filed: Aug 7, 2003Published: Feb 12, 2004
Est. expiryAug 7, 2022(expired)· nominal 20-yr term from priority
Inventors:Ravindranath Mukkamala
C10M 107/04C10M 2207/1253C10M 135/36C10M 2205/163C10N 2010/04C10N 2030/12C10N 2030/06C10M 2219/102C10N 2050/023C10M 2205/143C10N 2030/10C10M 135/16C10M 2219/09C10M 105/24
42
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Claims

Abstract

A composition comprising: (a) from 0.1% to 20% of at least one cyclic thiourea compound of formula I: wherein W is O or S; R 1 and R 2 independently are hydrogen, alkyl, alkenyl, aryl or aralkyl; R 3 and R 4 independently are hydrogen, alkyl, alkenyl, aryl or aralkyl, or R 3 and R 4 groups combine with ring carbon atoms to which they are attached to form a five- to seven-membered heterocyclic ring; and (b) a lubricating oil.

Claims

exact text as granted — not AI-modified
1 . A composition comprising: 
 (a) from 0.1% to 20% of at least one cyclic thiourea compound of formula I:                          wherein W is O or S; R 1  and R 2  independently are hydrogen, alkyl, alkenyl, aryl or aralkyl; R 3  and R 4  independently are hydrogen, alkyl, alkenyl, aryl or aralkyl, or R 3  and R 4  groups combine with ring carbon atoms to which they are attached to form a five- to seven-membered heterocyclic ring; and    (b) a lubricating oil.    
     
     
         2 . The composition of  claim 1  in which W is O, and R 1 , R 2 , R 3  and R 4  independently are hydrogen, alkyl, alkenyl, aryl or aralkyl.  
     
     
         3 . The composition of  claim 2  in which R 1 , R 2 , R 3  and R 4  independently are hydrogen or alkyl.  
     
     
         4 . The composition of  claim 3  in which at least one of R 1 , R 2 , R 3  and R 4  is C 6 -C 22  alkyl.  
     
     
         5 . The composition of  claim 1  in which W is S, and R 1 , R 2 , R 3  and R 4  independently are hydrogen, alkyl, alkenyl, aryl or aralkyl.  
     
     
         6 . The composition of  claim 1  in which R 3  and R 4  groups combine with ring carbon atoms to which they are attached to form a five- to seven-membered heterocyclic ring.  
     
     
         7 . The composition of  claim 6  in which the cyclic thiourea has formula  
       
         
           
           
               
               
           
         
       
       wherein R 5  and R 6  independently are hydrogen, alkyl, alkenyl, aryl or aralkyl.  
     
     
         8 . The composition of  claim 7  in which W is O, R 1  and R 6  are the same, and R 2  and R 5  are the same.  
     
     
         9 . The composition of  claim 8  in which R 1  and R 2  independently are hydrogen or alkyl.  
     
     
         10 . The composition of  claim 9  in which at least one of R 1  and R 2  is C 6 -C 22  alkyl.

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