US4409120A
Expired / Lapsed
US
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Process for forming oil-soluble product
Assignee: Shell USA Inc
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Filing: 1982-08-02
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Granted: 1983-10-11
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Expires: 2002-08-02
Abstract
Abstract Lubricating oil additives having both dispersant and viscosity index-improving properties are prepared by contacting a star-shaped polymer having a poly(polyalkenyl aromatic) nucleus, at least three conjugated diene homopolymer or copolymer arms linked to the nucleus, and at least one polymerized nitrogen containing polar compound arm linked to the nucleus, with a rectant selected from p-toluenesulfonylhydrazide and hydrazine under conditions wherein the reactants release H 2 N 2 , which adds across the residual double bonds in the polymer therein hydrogenating the aliphatic unsaturation and releasing N 2 gas.
Inventors
- 👤 Michael K. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:51
CPC Classifications
C; C10; C10M; C10M149/00; C10M149/02; C10M149/10; C08; C08F; C08F8/00; C08F8/04; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022; C10M149/06; C10M151/00; C10M151/02; C10M2205/00; C10M2205/04; C10M2205/06; C10M2217/00; C10M2217/02; C10M2217/024; C10M2217/028; C10M2217/06; C10M2221/00; C10M2221/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
161 words
A process for preparing an oil-soluble, star-shaped product, said process comprising: a. solution polymerizing one or more conjugated diene monomers and optionally one or more monoalkenyl arene monomers under polymerization conditions at a temperature between about -75° C. to +150° C. with an organomonolithium compound, therein forming living polymeric arms; b. contacting said living polymeric arms with a polyalkenyl aromatic coupling agent at a temperature between about 0° C. and about +150° C., therein forming a coupled polymer having a poly(polyalkenyl aromatic) nucleus and attached polymeric arms; c. contacting said coupled polymer with a nitrogen containing polar compound monomer therein attaching poly(nitrogen containing polar compound) arms to said nucleus; and d. contacting the resulting polymer with a reactant selected from the group consisting of hydrazine and p-toluenesulfonylhydrazide at a temperature between about 50° C. and about 150° C., therein forming N 2 H 2 , which reduces by hydrogenation at least about 80% of the aliphatic unsaturation of said polymeric arms.
Claim 2
Dependent Claim
161 words
A process for preparing an oil-soluble, star-shaped product, said process comprising: a. solution polymerizing one or more conjugated diene monomers and optionally one or more monoalkenyl arene monomers under polymerization conditions at a temperature between about -75° C. to +150° C. with an organomonolithium compound, therein forming living polymeric arms; b. contacting said living polymeric arms with a polyalkenyl aromatic coupling agent at a temperature between about 0° C. and about +150° C., therein forming a coupled polymer having a poly(polyalkenyl aromatic) nucleus and attached polymeric arms; c. contacting said coupled polymer with a nitrogen containing polar compound monomer therein attaching poly(nitrogen containing polar compound) arms to said nucleus; and d. contacting the resulting polymer with a reactant selected from the group consisting of hydrazine and p-toluenesulfonylhydrazide at a temperature between about 50° C. and about 150° C., therein forming N 2 H 2 , which reduces by hydrogenation at least about 80% of the aliphatic unsaturation of said polymeric arms.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the monomers of step (a) are selected from the group consisting of butadiene, isoprene and styrene.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein said monomers are selected from the group consisting of butadiene, isoprene and mixtures thereof.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein said monomer is isoprene.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein said polyalkenyl aromatic coupling agent is divinylbenzene.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein said nitrogen containing polar compound is selected from the group consisting of 2-vinylpyridine and 4-vinylpyridine.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein said nitrogen containing polar compound is 2-vinylpyridine.
Claim 9
Dependent Claim
27 words
The process of claim 6 wherein said nitrogen containing polar compound is contacted with said coupled polymer at a temperature between about -78° C. and +80° C.
Claim 10
Dependent Claim
28 words
The process of claim 1 wherein said monomer of step (a) is isoprene, said polyalkenyl aromatic coupling agent is divinylbenzene, and said nitrogen containing polar compound is 2-vinylpyridine.
Claim 11
Dependent Claim
13 words
The process of claim 1 or claim 9 wherein said reactant is p-toluenesulfonylhydrazide.
Claim 12
Dependent Claim
25 words
The process of claim 1 wherein the molar ratio of reactant in step (d) to conjugated diene units is between about 5:1 and about 1:1.
References Cited (Backward Citations)
US3763044A
Cited
US3772196A
Cited
US4085055A
Cited
US4116917A
Cited
US4077893A
Cited
US4141847A
Cited
US4358565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |