The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1981
Filed:
Dec. 31, 1979
Eric G Olsen, Kingsport, TN (US);
Winston J Jackson, Jr, Kingsport, TN (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
This invention relates to a process for the preparation of thermoplastic polymers. Specifically it relates to a process for the preparation of a substantially linear, high molecular weight phenoxy resin from hydroquinone, optionally up to about 20 mole percent of a second aromatic diol, epichlorohydrin (or another epihalohydrin) and a base, such as sodium hydroxide. Hydroquinone phenoxy resin is characterized by low permeability to oxygen and carbon dioxide and is, therefore, useful as a gas-barrier layer in multilayer plastic film constructions used in food-packaging and beverage bottle applications, for example. For use in such applications, the resin is generally in the form of a thin, uniform film prepared by extrusion, casting, or other such method. It is highly desirable that polymers used in this manner be as free as possible from chain branches or crosslinks, as these lead to the formation of gel particles which cause imperfections in the polymer film. These imperfections, in turn, detract from the appearance of the film. Moreover, as is well known, increasing the amount of chain branching in a polymer results in a undesirable reduction of flexibility and toughness.