End-capped multifunctional viscosity index improver
Patent
·
OSTI ID:5793873
This patent describes oil soluble composition of stabilized molecular weight useful as viscosity improver-dispersant additive for oleaginous compositions capable of providing oleaginous compositions exhibiting improved low temperature viscometric properties. It comprises oil soluble ethylene copolymer comprising from about 15 to 90 wt. % ethylene and from about 10 to 85 wt. % of at least one C{sub 3} to C{sub 28} alpha-olefin monomer, having a number average molecular weight of from about 5,000 to 500,000; polyamine having at least two primary amino groups, or polyol; an amount of high functionality long chain hydrocarbyl substituted dicarboxylic acid or anhydride having an average functionality of at least 1.2 wherein the long chain hydrocarbyl is derived from olefin polymer having a number average molecular weight of from about 400 to about 10,000 effective; and an amount of C{sub 12} to about C{sub 16} hydrocarbyl substituted dicarboxylic acid anhydride effective to stabilize the molecular weight of the oil soluble composition reaction product.
- Assignee:
- Exxon Chemical Patents Inc., Linden, NJ (USA)
- Patent Number(s):
- A; US 5035821
- Application Number:
- PPN: US 7-220311
- OSTI ID:
- 5793873
- Country of Publication:
- United States
- Language:
- English
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