Polyalkyl(meth)acrylates for improving fuel economy, dispersancy and deposits performance

1. A polyalkyl(meth)acrylate polymer, comprising the following monomers:

(a) 10to 25% by weight of the esters of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene;

(b) 45% to 60% by weight of the C 1-4 alkyl (meth)acrylates;

(c) 10% to 15% by weight of the styrene;

(d) 15% to 30% by weight of the C 10-30 alkyl (meth)acrylates; and

(e) 3% to 7% by weight of the N-containing monomers selected from the group consisting of N,N-dimethylaminoethvl methacrylate (DMAEMA), N-(3-(dimethylamino)propyl)methacrylamide (DMAPMAm), and N-vinylpyrrolidinone (NVP),

wherein the weight-average molecular weight of the polyalkyl(meth)acrylate polymer is in the range of 200,000 to 700,000 g/mol.

2. The polyalkyl (meth)acrylate polymer according to claim 1 , wherein the number-average molecular weight is in the range of 20,000 to 200,000 g/mol.

3. A process for improving deposit formation of a lubricating oil composition, the process comprising:

adding the polyalkyl(meth)acrylate polymer according to claim 1 to the lubricating oil composition,

wherein the polyalkyl(meth)acrylate polymer comprises N,N-dimethylaminoethyl methacrylate (DMAEMA) as the N-containing monomers.

4. An additive composition, comprising:

(A) 60 to 80% by weight of a base oil, and

(B) 20 to 40% by weight of the polyalkyl(meth)acrylate polymer of claims 1 .

5. A lubricating oil composition, comprising:

(A) 80 to 99.5% by weight of a base oil;

(B) 0.5 to 5% by weight of the polyalkyl(meth)acrylate comb polymer of claim 1 ; and

(C) 0 to 15% by weight of one or more further additives.

6. The lubricating oil composition according to claim 5 , comprising between 3% and 5% by weight of the polyalkyl(meth)acrylate comb polymer,

wherein the lubricating oil composition does not comprise a DI package.

7. The lubricating oil composition according to claim 5 , comprising between 1% and 2% by weight of the polyalkyl(meth)acrylate comb polymer,

wherein the lubricating oil composition further comprises a DI package.

8. The polyalkyl(meth)acrylate polymer according to claim 1 , wherein the C 10-30 alkyl (meth)acrylates are C 12-14 alkyl methacrylates.

9. The polyalkyl(meth)acrylate polymer according to claim 1 , wherein the N-containing mono er is DMAEMA.

10. The polyalkyl(meth)acrylate polymer according to claim 1 , comprising the following monomers:

(a) 10 to 20% by weight of the esters of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene;

(b) 45% to 55% by weight of the C 1-4 alkyl (meth)acrylates;

(c) 10% to 15% by weight of the styrene;

(d) 15% to 25% by weight of C 12-14 alkyl methacrylates; and

(e) 3% to 7% by weight of N,N-dimethylaminoethyl methacrylate (DMAEMA).

11. The polyalkyl(meth)acrylate polymer according to claim 1 , consisting of the following monomers:

(a) 10 to 25% by weight of the esters of (meth)acrylic acid and a hydroxy lated hydrogenated polybutadiene;

(b) 45% to 60% by weight of the C 1-4 alkyl (meth)acrylates;

(c) 10% to 15% by weight of the styrene;

(d) 15% to 30% by weight of the C 10-30 alkyl (meth)acrylates; and

(e) 3% to 7% by weight of the N-containing monomers selected from the group consisting of N,N-dimethylaminoethyl methacrylate (DMAEMA), N-(3-(dimethylamino)propyl)methacrylamide (DMAPMAm), and N-vinyl pyrrolidinone (NVP).

12. A polyalkyl(meth)acrylate polymer, comprising the following monomers:

(a) 10 to 25% by weight of the esters of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene;

(b) 30% to 45% by weight of the C 1-4 alkyl (meth)acrylates;

(c) 19% to 30% by weight of the styrene;

(d) 15% to 30% by weight of the C 10-30 alkyl (meth)acrylates; and

(e) 3% to 7% by weight of the N-containing monomers selected from the group consisting of N,N-dimethylaminoethyl methacrylate (DMAEMA), N-(3-(dimethylamino)propyl)methacrylamide (DMAPMAm), and N-vinylpyrrolidinone (NVP),

wherein the weight-average molecular weight of the polvalkyl(meth)acrylate polymer is in the range of 200,000 to 700,000 g/mol.

13. A process for improving deposit formation of a lubricating oil composition, the process comprising:

adding the polyalkyl(meth)acrylate polymer according to claim 12 to the lubricating oil composition, wherein the polyalkyl(meth)acrylate polymer comprises

N,N-dimethylaminoethyl methacrylate (DMAEMA) as the N-containing monomers.

14. An additive composition, comprising:

(A) 60 to 80% by weight of a base oil, and

(B) 20 to 40% by weight of the polyalkyl(meth)acrylate polymer of claim 12 .

15. A lubricating oil composition, comprising:

(A) 80 to 99.5% by weight of a base oil;

(B) 0.5 to 5% by weight of the polyalkyl(meth)acrylate polymer of claim 12 ; and

(C) 0 to 15% by weight of one or more further additives.

16. The polyalkyl(meth)acrylate polymer according to claim 12 , wherein the number-average molecular weight is in the range of 20,000 to 200,000 g/mol.

17. The polyalkyl(meth)acrylate polymer according to claim 12 , wherein the C 10-30 alkyl (meth)acrylates are C 12-14 alkyl methacrylates.

18. The polyalkyl(meth)acrylate polymer according to claim 12 , wherein the N-containing monomer is DMAEMA.

19. The polyalkyl(meth)acrylate polymer according to claim 12 , consisting of the following monomers:

(a) 10 to 25% by weight of the esters of acrylic acid and a hydroxylated hydrogenated polybutadiene;

(b) 30% to 45% by weight of the C 1-4 alkyl (meth)acrylates;

(c) 19% to 30% by weight of the styrene;

(d) 15% to 30% by weight of the C 10-30 alkyl (meth)acrylates; and

(e) 3% to 7% by weight of the N-containing monomers selected from the group consisting of N,N-dimethylaminoethyl methacrylate (DMAEMA), N-(3-(dimethylamino)propyl)methacrylamide (DMAPMAm), and N-vinylpyrrolidinone (NVP).