C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
253/128
C10M 1/18 (1980.01)
Patent
CA 1168223
ABSTRACT OF THE DISCLOSURE The resistance to mechanical degradation of poly- mer modified lubricating oils can be improved by reducing the elastic character of the fluids at a given viscosity and polymer concentration. Stored energy per bond, which is the energy for degradation, and which is provided by the flow process, is related to this elasticity. This stored energy can be reduced by altering the molecular weight distribution and molecular topology, i.e., macroscopic structure (linear, branched and ring structures) of the polymer. When a polymer solution is deformed, part of the energy is expended as viscous dissipation (i.e. heat) and part causes deformation of the polymer molecules which stores energy rather than dissipating it. The amount of energy the molecules can store is measured by their compliance, which indicates for example how much the chains will retract when the stress is removed. A large compliance means that the molecules deform easily when stress is applied. Stored energy per volume of solution is quantitatively related to the elasticity of the solutions through the compliance of the solution. This solution compliance depends on the com- pliance of the polymer molecules and their concentration. Rules are formulated using the compliance which permit selection of MWD and molecular topology to maximize mechan- ical stability. Nonlinear structures and particular MWD classes are claimed.
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Graessley William W.
Kresge Edward N.
Ver Strate Gary W.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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