Mono- or biaxially drawn polyketone films
AssigneeShell Oil Company
InventorsGeorge B. Klingensmith, Randolph N. Campbell
Life of this patent
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Abstract
Processes for producing mono- and biaxially drawn polyketone films from linear polymers of carbon monoxide, ethylene, and at least one ethylenically unsaturated hydrocarbon having a melting point of at least 214.degree. C., comprising drawing of a linear polymer sheet along one or two axes, respectively, at a draw temperature of from about 4.degree. to 15.degree. C. below the melting point of the terpolymer, and a draw ratio of between 4 to 20. Also disclosed are the products which have and exhibit good properties of strength and stiffness, even at low draw ratios, produced by these processes.
Claims4
A non-porous biaxially drawn terpolymer film of a linear alternating polymer of carbon monoxide, ethylene and a second ethylenically unsaturated hydrocarbon of at least 3 carbon atoms, wherein said terpolymer has a melting point of at least 214.degree. C. made by the process comprising the steps of drawing a sheet of said film along two axes, at a draw ratio of from 4 to about 20, at a draw temperature of from 4.degree. to 15.degree. C. below the melting point of said terpolymer.
A non-porous monoaxially drawn terpolymer film of a linear alternating polymer of carbon monoxide, ethylene and a second ethylenically unsaturated hydrocarbon of at least 3 carbon atoms, wherein said terpolymer has a melting point of at least 214.degree. C. made by the process comprising the steps of drawing a sheet of said film along one axis, at a draw ratio of from 4 to 20, and at a draw temperature of from 4.degree. to 15.degree. C. below the melting point of the terpolymer.
Dependencies are inferred from the claim text.