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AssigneeExxonMobil Research and Engineering Company
InventorsJohannes Matthieu Soulages, David John Lohse, Andy Haishung Tsou, Thomas Sun, Pamela Jean Wright, Nikos Hadjichristidis, Pradeep Pandurang Shirodkar
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Provided are blends of branched hydrocarbon comb polymers having tailored branching and molecular weight parameters, with substantially linear polymers. Such blends have been found to have improved extensional rheological properties, while maintaining nearly the viscosity of the substantially linear polymers. The blends of the hydrocarbon comb polymers with the substantially linear polymers thus maintain the extrusion processing characteristics of the linear polymer alone, but have improved extensional flow processability, with strain hardening ratios (SHR) greater than 1. The blends are effective in blown film processing. Also disclosed are related methods for improving extensional flow processability using the branched hydrocarbon comb polymers, as well as the branched hydrocarbon comb polymers themselves, including as a property enhancing additive for such substantially linear polymers.
A polymer blend composition comprising a blend of one or more substantially linear polymers and an effective amount of one or more comb polymers having a backbone with polymeric arms attached thereto, which comb polymer imparts to the blend an extensional rheology, as measured by strain hardening ratio (SHR), of greater than 1, and an increase in zero-shear-rate viscosity of less than or equal to 5% as compared to the same one or more substantially linear polymers alone;
A process for preparing a polymer blend composition comprising a blend of one or more substantially linear polymers having improved processing, as well as improved overall performance balance as compared to the same one or more substantially linear polymers alone, said process comprising:
A method for improving one or more of the physical properties of one or more substantially linear polymers, said properties including the processing characteristics of such polymers and the overall performance balance for such polymers, said process comprising adding to the one or more substantially linear polymers polymer(s) an effective amount of one or more comb polymers having a backbone with polymeric arms attached thereto such that the resulting blend has an extensional rheology, as measured by strain hardening ratio (SHR), of greater than 1, and an increase in zero-shear-rate viscosity of less than or equal to 5% as compared to the same one or more substantially linear polymers alone;
Dependencies are inferred from the claim text.