Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-05-24
1989-10-31
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
252 9, 252 43, 524505, C08L 5302, C10M14310, C10M14312
Patent
active
048778362
ABSTRACT:
A polymeric blend particularly useful as a VI improver, which polymeric blend comprises a selectively hydrogenated asymmetric radial polymer comprising a plurality of polymeric arms containing hydrogenated conjugated diolefin monomer units and at least one block copolymer arm comprising a single polymeric block containing predominantly monoalkenyl aromatic hydrocarbon monomer units and a single polymeric block containing predominantly hydrogenated conjugated diolefin monomer units and a selectively hydrogenated linear diblock copolymer containing a single polymeric block containing principally monoalkenyl aromatic hydrocarbon monomer units and a single polymeric block containing predominantly hydrogenated conjugated diolefin monomer units. Both polymers in the blend will be selectively hydrogenated so as to convert (saturate) at least 95% of the ethylenic unsaturation initially contained therein. When used as a VI improver, the polymeric blend unexpectedly improves the thickening efficiency over and above the thickening efficiency that would be expected from a consideration of the individual contribution made by each of the polymers separately. The monoalkenyl aromatic hydrocarbon polymer blocks in both polymers is preferably styrene and the conjugated diolefin in both polymers is preferably isoprene. Preferably, both polymers are selectively hydrogenated so as to convert (saturate) at least 99% of the ethylenic unsaturation initially contained therein.
REFERENCES:
patent: 3554911 (1971-01-01), Schiff et al.
patent: 3668125 (1972-06-01), Anderson
patent: 3700633 (1972-10-01), Weber et al.
patent: 3772196 (1973-11-01), St. Clair et al.
patent: 3775329 (1973-11-01), Eckert
patent: 3835053 (1974-09-01), Meier et al.
patent: 4116917 (1978-09-01), Eckert
patent: 4156673 (1979-05-01), Eckert
patent: 4216131 (1980-08-01), Himes et al.
patent: 4391949 (1983-05-01), St. Clair
Briggs Sr. Wilbert J.
Shell Oil Company
LandOfFree
Viscosity index improver and composition containing same 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 improver and composition containing same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Viscosity index improver and composition containing same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-626566