Viscosity index improver for lubricants based on polyisobutylene acrylamide comb copolymers
AssigneeBASF SE
InventorsIvette GARCIA CASTRO, Rene KOSCHABEK, Andrea MISSKE, Christoph FLECKENSTEIN
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Abstract
The present invention relates to a comb copolymer comprising in polymerized form up to 40 wt % of a PIB macromonomer of the formula (I) and a hydrophobic monomer of the formula (II). The invention further relates to a method of preparing the PIB macromonomer of the formula (I) where a polyisobutene amine of the formula (IV) is reacted with (meth)acrylic acid anhydride; and to a lubricant comprising a base oil, the comb copolymer, and further lubricant additives; and to a use of the comb copolymer for improving the viscosity index of a lubricating oil.
Claims16
-15. (canceled)
A comb copolymer comprising in polymerized form
- (A) up to 40 wt % of a PIB macromonomer of the formula (I)
- where R1 is H or methyl, and n is a number from 5 to 100, and
- (B) a hydrophobic monomer of the formula (II)
- H2C═C(R1)COOR2 (II)
- where R1 is H or methyl, and R2 is C5-36 alkyl.
A method of preparing the PIB macromonomer of the formula (I)
- where R1 is H or methyl, and n is a number from 5 to 100,
- where a polyisobutene amine of the formula (IV)
- is reacted with (meth)acrylic acid anhydride.
Dependencies are inferred from the claim text.