Linear hydroquinone phenoxy polymers and process

Details Linear hydroquinone phenoxy polymers and process Linear hydroquinone phenoxy polymers and process

1979-12-31

1981-05-12

Nielsen, Earl A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528 87, 528104, 428413, G08G 5906

Patent

active

042673011

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.

REFERENCES:
patent: 2602075 (1952-07-01), Carpenter et al.
patent: 3238087 (1966-03-01), Norwalk et al.
patent: 3395118 (1968-07-01), Reinking et al.
patent: 3701680 (1972-10-01), Lee et al.
patent: 3767618 (1973-10-01), Hairston et al.

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