Viscosity index improvers for lubricating oil compositions

Details Viscosity index improvers for lubricating oil compositions Viscosity index improvers for lubricating oil compositions

2007-01-16

2007-01-16

McAvoy, Ellen M. (Department: 1764)

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Solid hydrocarbon polymer

C526S335000, C585S010000, C585S012000

Reexamination Certificate

active

10611231

ABSTRACT:
A polymer suitable for use as a viscosity index improver for lubricating oil compositions, which is at least one, at least partially hydrogenated linear or star-shaped random copolymer of isoprene and butadiene, in which at least 70 wt. % of the butadiene is incorporated into the polymer as 1,4 units and the weight ratio of isoprene addition product to butadiene addition product in the copolymer is in a range of from about 90:10 to about 70:30.

REFERENCES:
patent: 3795615 (1974-03-01), Pappas et al.
patent: 4032459 (1977-06-01), Crossland et al.
patent: 4073737 (1978-02-01), Elliott
patent: 4116917 (1978-09-01), Eckert
patent: 4156673 (1979-05-01), Eckert
patent: 4409120 (1983-10-01), Martin
patent: 4849481 (1989-07-01), Rhodes et al.
patent: 5310490 (1994-05-01), Struglinski et al.
patent: 5458791 (1995-10-01), Rhodes et al.
patent: 5460739 (1995-10-01), Rhodes et al.
patent: 5543469 (1996-08-01), Struglinski et al.
patent: 5633415 (1997-05-01), Brandes et al.
patent: 5637783 (1997-06-01), Brandes et al.
patent: 5780540 (1998-07-01), Brandes et al.
patent: 6034042 (2000-03-01), Rhodes
patent: 6303550 (2001-10-01), Wedlock et al.

Affiliated with

Also associated with

Rating

Viscosity index improvers for lubricating oil compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Viscosity index improvers for lubricating oil compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Viscosity index improvers for lubricating oil compositions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3782829