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.