Lubricant polymers

Abstract

A method of increasing the spreading of a lubricant on the liner surface after it's delivery, wherein the method comprises preparing the lubricant compositions comprising copolymers of monomers (A) selected from C6-C10 alkyl methacrylate monomers, and monomers (B) selected from C10-C18 alkyl methacrylate monomers, and a base oil or comprising a copolymer obtained by combining at least monomers (A) selected from C6-C10 alkyl methacrylate monomers, and monomers (B) selected from C10-C18 alkyl methacrylate monomers in a mixture and co-polymerizing the monomers for increasing the spreading and/or the self-spreading of the lubricant on the cylinder liner surface after its delivery.

1 .- 15 . (canceled) 
     
     
         16 . A method of increasing the spreading of a lubricant on the liner surface after its delivery, wherein said method comprises preparing a lubricant composition comprising:
 a copolymer of alkyl methacrylate monomers, wherein said alkyl methacrylate monomers comprise at least:   a. Monomers (A) selected from C6-C10 alkyl methacrylate monomers,   b. Monomers (B) selected from C10-C18 alkyl methacrylate monomers,   a base oil.   
     
     
         17 . The method according to  claim 16 , wherein the copolymer is obtained by combining at least
 a. Monomers (A) selected from C6-C10 alkyl methacrylate monomers,   b. Monomers (B) selected from C10-C18 alkyl methacrylate monomers,   in a mixture and co-polymerizing the monomers, and   a base oil.   
     
     
         18 . The method according to  claim 16 , wherein monomers (A) and monomers (B) represent at least 75% by weight of the total weight of monomers used to prepare the copolymer. 
     
     
         19 . The method according to  claim 16 , wherein the weight ratio of monomers (B) to monomers (A) in the copolymer is 99:1 to 10:90. 
     
     
         20 . The method according to  claim 16 , wherein monomers (A) are branched. 
     
     
         21 . The method according to  claim 20 , wherein monomers A are 2-ethyl hexyl methacrylate. 
     
     
         22 . The method according to  claim 16 , wherein monomers (B) are linear. 
     
     
         23 . The method according to  claim 22 , wherein monomers (B) are a mixture of C10 alkyl methacrylate, C12 alkyl methacrylate, C14 alkyl methacrylate, C16 alkyl methacrylate and C18 alkyl methacrylate. 
     
     
         24 . The method according to  claim 16 , wherein the copolymer is a copolymer of a mixture of C10 alkyl methacrylate, C12 alkyl methacrylate, C14 alkyl methacrylate, C16 alkyl methacrylate and C18 alkyl methacrylate, and a C8 alkyl methacrylate. 
     
     
         25 . The method according to  claim 16 , wherein the mass ratio of the monomers (B) to monomers (A) is from 90:10 to 80:20. 
     
     
         26 . The method according to  claim 16 , wherein the quantity of copolymer is from 0.01% to 10% by weight relative to the total weight of the lubricant composition. 
     
     
         27 . The method according to  claim 16 , wherein the lubricant further comprises an optional additive chosen amongst a neutral detergent, an overbased detergent, an anti-wear additive, a fatty amine soluble in lubricant, a polymer, a dispersing additive, an anti-foaming additive or a mixture thereof. 
     
     
         28 . The method according to  claim 16 , wherein the lubricant composition is a marine lubricant having a BN determined according to the standard ASTM D-2896 of at most 50 milligrams of potassium hydroxide per gram of the lubricant composition. 
     
     
         29 . The method according to  claim 16 , wherein the lubricant composition is a marine lubricant having a BN determined according to the standard ASTM D-2896 of at least 50 milligrams of potassium hydroxide per gram of the lubricant composition. 
     
     
         30 . The method according to  claim 16 , for two-stroke marine engines. 
     
     
         31 . The method according to  claim 16  for further increasing the self-spreading of the lubricant on the cylinder liner surface after its delivery. 
     
     
         32 . The method as defined  claim 16  for increasing the self-spreading of the lubricant on the cylinder liner surface after its delivery.