Lubricant Additives

Dispersants 159

CH 3

CH 3

CH 2 CH CH 2

m n

+

N

Ethylene − propylene copolymer 4-Vinylpyridine

Radical

initiator

CH 2 CH 2

CH 3

CH CH 2 CH 2 CH 2

CH 3

m n −^1

N

Dispersant olefin copolymer (DOCP)

FIGURE 5.13 Dispersant viscosity modifi er synthesis through grafting.

CH 3

CH 3

CH 2 CH 2

COOR n−x

x

C

CH (^3) CH
3
CH 3
C CH 2 C C OCH 2 CH 2 N
O
n H 2 C COOR
Dimethylaminoethyl
Radical methacrylate
initiator
Alkyl methacrylate
CH 3
CH 3
OCH 2 CH 2 N
CH 3
CH 3
C CH 2
C
Polyacrylate-Type Dispersant Viscosity Modifier
O
COOR

• C
  FIGURE 5.14 Dispersant viscosity modifi er synthesis through copolymerization.