Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1989-05-30
1990-10-16
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528173, 528176, 528195, C08G 63123
Patent
active
049636413
DESCRIPTION:
BRIEF SUMMARY
The invention relates to polyester resins useful for forming packages which have improved gas barrier properties.
Presently there is a strong interest in the packaging industry for protecting consumable products such as foodstuffs, medicines, and especially carbonated beverages by enveloping the substances in packages which are formed from various polymers. While molded containers formed from known polyesters have many desirable characteristics, there is a need in the art to provide improved polyester containers which will have lower gas permeabilities. Such improved containers would be much more versatile in their utilization and allow the containers to be used to package substances for which containers of known polyesters may not be suitable.
In accordance with the present invention, it has been found that a particular polyester exhibits enhanced gas barrier properties. The polyester can be described as comprising the reaction product of ##STR2## wherein X is hydrogen or unsubstituted alkyl containing 1-5 carbons and n is an integer in the range of 4 to 10, and 1,4-butanediol and 1,4-cyclohexanedimethanol.
Although n can broadly be in the range of 4 to 10 preferably n is 5 and the ##STR3## moiety is a divalent radical analog of cyclohexane.
Although broadly X can either be hydrogen or an unsubstituted alkyl group containing 1-5 carbons, preferably X is hydrogen. Examples of alkyl groups include methyl, ethyl, propyl, and butyl.
Most preferably, the diol component is ethylene glycol. Additionally, minor amounts (i.e., less than about 50 mole percent, and, perferably, less than about 10 mole percent, based on the total amount of diol present in the polyester) of other known polyester-forming glycols may also be employed. Such diols may include, for example, 2,4-dimethyl-2-ethylhexane-1,3-diol; 2-ethyl-2-butyl-1,3-propanediol; 2-ethyl-2-isobutyl-1,3-propanediol; 2,2,4-trimethyl-1,6-hexanediol; 4,4'-sulfonyldiphenol; 4,4'-oxydiphenol; 4,4'-isopropylidenediphenol; 2,5-naphthalenediol; and other well known polyester-forming diols.
The polyesters of the present invention exhibit an I.V. of at least 0.5, preferably at least 1.0 measured at 25.degree. C. in a 60/40 by weight mixture of phenol/tetrachloroethane at a concentration of 0.5 g/100 mL.
The polyesters of the present invention are prepared by methods well-known in the art. The reactants may all be reacted in a single operation or, alternatively, sequential operation may be employed. Temperatures which are suitable for forming the polyesters generally range between about 180.degree. C. and about 295.degree. C., with the preferred range being about 200.degree. C. to 285.degree. C. The reaction may be conducted under an inert atmosphere, such as nitrogen. Preferably, the latter stage of the reaction is conducted under a vacuum. Conventional catalysts are typically used.
Optionable additives, such as dyes, pigments, plasticizers, fillers, antioxidants and stabilizers may be employed in conventional amounts. Such additives may be added directly to the reaction or may be added to the final polymer.
The polyesters are formed into containers using conventional plastic processing techniques such as compression molding and blow molding. Preferably the molded containers are biaxially oriented blow-molded containers. Strong, flexible and clear sheets, films and other like structures can be formed by well known extrusion techniques. These may be formed into wrappers, bags and the like.
The polyesters may also be used to form a laminating layer between two or more permeable layers of film. In like manner, a layer of the polyester of the present invention may be coextruded as a pipe or similar structure between two or more compatible, permeable layers. The polyesters may also be used for dip coating containers from a polymer solution in order to improve the barrier properties of a package. In each of these embodiments, the present invention offers the additional advantage of not requiring the use of a tie layer.
Containers made from the polyesters are ideally suited for
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Anderson Harold D.
Eastman Kodak Company
Heath, Jr. William P.
Martin Charles R.
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