Solid viscosity index improvers which provide excellent low temp

Details Solid viscosity index improvers which provide excellent low temp Solid viscosity index improvers which provide excellent low temp

1993-03-22

1994-01-11

Jagannathan, Vasu S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525250, 525271, 252 43, C08F29704, C10M14310, C10M14312

Patent

active

052782522

ABSTRACT:
A solid, cyclone-finishable polymer which does not exhibit cold flow and provides an unexpected balance of viscosity improving properties for oil compositions is produced by hydrogenating a copolymer comprising a homopolymer block of isoprene connected to a copolymer block of isoprene and a monoalkenyl aromatic hydrocarbon. The amount of the monoalkenyl aromatic hydrocarbon is sufficient to allow cyclone finishing although sufficiently distributed to provide oil compositions having good low temperature viscosity. Prior to hydrogenation, the copolymers have a number average molecular weight between 125,000 and 275,000, preferably 150,000 to 240,000, and a total monoalkenyl aromatic content between 10 and 2 percent by weight, preferably between 7 and 3 percent. The copolymer is hydrogenated to substantially saturate the isoprene and to reduce the size of monoalkenyl aromatic segments in the copolymer block.

REFERENCES:
patent: 3700633 (1972-10-01), Wald et al.
patent: 3772196 (1973-11-01), St. Clair et al.
patent: 3775329 (1973-11-01), Eckert
patent: 3792127 (1974-02-01), Gillies
patent: 3823203 (1974-07-01), De La Mare
patent: 3835083 (1974-09-01), Tinkelenberg
patent: 4081390 (1978-03-01), Richardson
patent: 4104330 (1978-08-01), Danzig et al.
patent: 4152370 (1979-05-01), Moczygemba
patent: 4194057 (1980-03-01), Brankling et al.
patent: 4412087 (1983-10-01), Trepka
patent: 4418234 (1983-11-01), Schiff et al.
patent: 4689368 (1987-08-01), Jenkins
patent: 4704434 (1987-11-01), Kitchen et al.

Affiliated with

Also associated with

Rating

Solid viscosity index improvers which provide excellent low temp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solid viscosity index improvers which provide excellent low temp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid viscosity index improvers which provide excellent low temp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1632132