Exxon Research and Engineering Company

Gary W Ver Strate

Edward N Kresge

Francis P Baldwin

Stanley J Brois

Ricardo A Bloch

John E Johnston

James A Rae

William W Graessley

W R Song

An ethylene ter- or tetrapolymer useful as a viscosity modifer and a process for preparing the polymer. The polymer comprises ethylene, an alpha-olefin, a non-conjugated diene and, optionally, a cationically polymerizable monoolefin. The polymerization catalyst comprises a Ziegler catalyst in conjunction with a cationic polymerization catalyst.

Ethylene polymer useful as a lubricating oil viscosity modifier E-25

Fluid solutions, e.g. mineral oil solutions, of polydispersed polymers have improved resistance to mechanical shear when said polymers have a narrow molecular weight distribution, i.e. ##EQU1## 10 and/or a reduced compliance less than that of a linear monodisperse polymer of the same chemical repeat unit and M.sub.w and preferably said solution at a concentration such that [.eta.] c ranges from one-tenth to five where [.eta.] is the intrinsic viscosity of the polymer in the oil and c is the concentration in the same units and/or has a compliance no larger than twenty times the value exhibited by an identical solution except that said polymer was replaced by a linear monodisperse polymer of the same chemical structure and of the same (.+-.5%) weight average molecular weight (M.sub.w).

Hydrocarbon solutions of macromolecular polymers having an improved

An ethylene ter- or tetrapolymer useful as a viscosity modifier and a process for preparing the polymer. The polymer comprises ethylene, an alpha-olefin, a non-conjugated diene and, optionally, a cationically polymerizable monoolefin. The polymerization catalyst comprises a Ziegler catalyst in conjunction with a cationic polymerization catalyst.

Ethylene polymer useful as a lubricating oil viscosity modifier

Ethylene-alpha-olefin copolymers are disclosed being particularly useful as improving the low temperature viscosity and pumpability properties of lubricating oil comprised of a major and minor component each of which have a defined ethylene sequence distribution with respect to the number of ethylenes in sequences of three or more and the percent of ethylene sequences of three or more ethylene units. Ethylene-propylene copolymers are the preferred embodiment.

Lubricating oil compositions containing ethylene-alpha-olefin polymers

Macromolecules with a distribution of molecular weights and functionality which can be rendered useful by heterogeneous catalytic modification are selectively modified on the basis of molecular dimensions and diffusion rates, using catalysts with specific pore size and particle size distribution. For example, liquid polymers are produced having both hydroxyl and carbonyl functionality with the carbonyl/hydroxyl ratio increasing with molecular weight. More specifically, a high molecular weight polymer is cleaved by ozonation with subsequent reduction with a heterogeneous catalyst having some pores smaller than the radii of gyration of the largest fractions but larger than the radii of gyration of other fractions of the molecular weight distribution of the polymer. The reduction may be performed in an intraparticle mass transfer controlling regime which further influences reduction efficiency as a function of molecular weight. This selectivity is used to narrow or otherwise modify the functionality distribution and make the product generally more useful.

Method for controlling the functionality distribution of liquid

There are disclosed monofunctional and polyfunctional aliphatic oxycarbonylsulfenyl chlorides having general utility as crosslinking, coupling and chemical modification agents for olefin containing polymers, particularly unsaturated rubber hydrocarbon elastomers.

Crosslinking and chemical modification agents for olefin containing

Terminally-functional saturated hydrocarbon low molecular weight liquid polymers are prepared by cationic polymerization of a 1-alkene containing at least one tertiary or phenyl substituted carbon in the presence of a transfer agent containing a benzylic or tertiary halogen and at least one primary or secondary halogen wherein the 1-alkene is capable of being polymerized by a Friedel Crafts catalyst.

Low molecular weight terminally-functional saturated hydrocarbon polymer

Olefin containing polymers treated with oxycarbonylsulfenyl halides

Disclosed is a method of preparing a moisture curable elastomer by reacting an elastomer containing randomly distributed sites of conjugated olefinic unsaturation with a cyclic unsaturated anhydride then blending the reaction product with a polyvalent metal compound and, optionally, a basic hydrolysis catalyst.

Growing community of inventors

Matawan, NJ, United States of America

Gary W Ver Strate