Hydrocarbon solutions of macromolecular polymers having an improved resistance to mechanical degradation
US4620048A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1984 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | Apr 17, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2020/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.