Claims
- 1. 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.degree. C. to +150.degree. 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.degree. C. and about +150.degree. 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.degree. C. and about 150.degree. C., therein forming N.sub.2 H.sub.2, which reduces by hydrogenation at least about 80% of the aliphatic unsaturation of said polymeric arms.
- 2. The process of claim 1 wherein the monomers of step (a) are selected from the group consisting of butadiene, isoprene and styrene.
- 3. The process of claim 2 wherein said monomers are selected from the group consisting of butadiene, isoprene and mixtures thereof.
- 4. The process of claim 3 wherein said monomer is isoprene.
- 5. The process of claim 1 wherein said polyalkenyl aromatic coupling agent is divinylbenzene.
- 6. The process of claim 1 wherein said nitrogen containing polar compound is selected from the group consisting of 2-vinylpyridine and 4-vinylpyridine.
- 7. The process of claim 6 wherein said nitrogen containing polar compound is 2-vinylpyridine.
- 8. The process of claim 6 wherein said nitrogen containing polar compound is contacted with said coupled polymer at a temperature between about -78.degree. C. and +80.degree. C.
- 9. 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.
- 10. The process of claim 1 or claim 9 wherein said reactant is p-toluenesulfonylhydrazide.
- 11. 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.
Parent Case Info
This is a continuation, of application Ser. No. 332,692, filed Dec. 21, 1981, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
332692 |
Dec 1981 |
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