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US 4,895,689 AGranted
Process for preparing heat treated solution cast polyketone-based barrier polymer materials
AssigneeShell Oil Company
InventorLeonard E. Gerlowski
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Abstract
A process for preparing a polymer material having improved oxygen and carbon dioxide barrier properties wherein a heated solution cast film, of a linear alternating polymer of carbon dioxide and at least one ethylenically unsaturated hydrocarbon, is cooled at a selected rate.
Claims6
A process for preparing a polymer material having improved oxygen and carbon dioxide barrier properties comprising the steps of:
- blending together hexafluoroisopropanol and a member selected from the group consisting of methanol, ethanol, isopropyl alcohol, butanol, and mixtures thereof, in a ratio of vol% ranging from 99:1 to 60:40;
- adding a quantity of a linear alternating polymer of carbon monoxide and at least one ethylenically unsaturated hydrocarbon to form up to a 17wt% solution of said polymer;
- casting said solution forming a solution cast film;
- heating said solution cast film to a temperature in the range from about 20.degree. C. to below to about 0.degree. C. below the melting point of the polymer;
- and
- cooling said heated solution cast film at from about 6.degree. C. to about 10.degree. C. per minute.
3 more elements
Dependencies are inferred from the claim text.