Oil compositions containing modified star polymers

Details Oil compositions containing modified star polymers Oil compositions containing modified star polymers

1990-05-15

1991-07-30

Willis, Prince E.

Compositions

Electrolytes for electrical devices

C10M14900

Patent

active

050358200

ABSTRACT:
Lubricating oil compositions which contain hydrogenated diene star polymers grafted with N-vinylimidazole exhibit improved engine performance when prepared by grafting the polymer in an oil mixture containing at least 6% by weight of the star polymer. The grafting is accomplished by contacting the polymer with from about 3.0 to about 5.5 wt % N-vinylimidazole when N-vinylimidazole is the sole reactant and from about 1.0 to about 5.0 wt % N-vinylimidazole when N-vinylimidazole is used in combination with N-vinylpyrrolidone.

REFERENCES:
patent: 4222882 (1980-09-01), Brulet et al.
patent: 4229308 (1980-10-01), Brulet et al.
patent: 4358565 (1982-11-01), Eckert
patent: 4409120 (1983-10-01), Martin
patent: 4427834 (1984-01-01), Martin
patent: 4557849 (1985-12-01), Eckert
patent: 4693838 (1987-09-01), Varma et al.
patent: 4699723 (1987-10-01), Kapuscinski et al.
patent: 4780228 (1988-10-01), Gardiner et al.
patent: 4820776 (1989-04-01), Kapuscinski et al.

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