Abstract: Polymer blends are disclosed which contain 75-90 weight % of a linear high-density ethylene polymer (density at least 0.94 gm/ml, melt index less than 0.5 gm/10 min) and 10-25 weight % of a linear low-density ethylene polymer (density less than 0.93 gm/ml, melt index less than 2.0 gms/10 min). The blends have a combination of physical properties and environmental stress crack resistance which make them well-suited for conversion to blow-molded containers for use in packaging aqueous detergent compositions.

Abstract: Copolyesters of iso- or terephthalic acid, ethylene glycol, 1,3 bis(2-hydroxyethoxy) benzene, and possibly other diols, have lower 0.sub.2 and CO.sub.2 permeabilities because of the 1,3 bis(2-hydroxyethoxy) benzene reactant. Also disclosed are hollow containers, sheet and film made from such copolyesters.

Abstract: Disclosed are copolyesters based on terephthalic or isophthalic acids, or both and at least one of 1,3 bis(2-hydroxyethoxy)benzene and bis(4-.beta.-hydroxyethoxyphenyl) sulfone, which also contain 1,4 bis(2-hydroxyethoxy)benzene as one of the diol reactants in order to prepare solid copolyesters having improved folding endurance or fatigue resistance than the same copolyesters without such coreactant.

Abstract: Disclosed is a process for preparing a saturated polyester resin containing ##STR1## groups and having good stability against generation of acetaldehyde at elevated temperatures, which comprises having an alkali metal salt of ethylenediaminetetraacetic acid present in the melt polymerization reaction mixture during formation of such polyester, in an amount up to 0.5 mol percent based on the saturated di- and polycarboxylic acid moieties entering into the polymerization reaction, and products.

Abstract: Disclosed are copolyesters based on terephthalic acid, ethylene glycol and bis (4-.beta.-hydroxyethoxyphenyl) sulfone made by solid state polycondensation of a lower molecular weight polymer thereof, a process for making same, and containers, packages and packaging materials made therefrom. The copolyesters have low acetaldehyde content.

Abstract: Disclosed are new copolyesters of terephthalic acid, bis(4-.beta.-hydroxyethyoxyphenyl)sulfone, ethylene glycol and a very small amount of a trifunctional cross-linking agent, particularly useful as molding compounds, especially for the extrusion-blow molding process of making hollow articles, and a method of making hollow articles.

Abstract: A method and apparatus are disclosed for developing a strain crystallized morphology in blowbottles of thermoplastic material by a heat treatment process subsequent to a blow molding operation. In a first embodiment, the blow mold itself includes means for differentially heating the blown article along its length so that only those portions which have been significantly molecularly oriented are heat treated. In a second embodiment, separate mold-shaped members are mounted adjacent the blow mold to receive the blown articles to apply the desired heat treatment process. In the method, an essentially amorphous thermoplastic parison is expanded in a blow molding operation at a temperature conducive to molecular orientation and strain induced crystallization. Then, the highly molecularly oriented bottle portions are heat treated to develop crystalline growth, while other non-molecularly oriented bottle portions may be simultaneously cooled.

Abstract: Disclosed are new copolyesters of terephthalic acid, bis(4-.beta.-hydroxyethoxyphenyl)sulfone, ethylene glycol and a very small amount of trimellitic acid, particularly useful as molding compounds, especially for the extrusion-blow molding process of making hollow articles, and a method of making hollow articles.

Abstract: Disclosed are new copolyesters of terephthalic acid, bis(4-.beta.-hydroxyethoxyphenyl)sulfone, ethylene glycol and a very small amount of trimellitic acid, particularly useful as molding compounds, especially for the extrusion-blow molding process of making hollow articles, and method of making hollow articles.

Abstract: Linear copolyesters are contemplated having the following repeating units: ##STR1## in their backbone structure. These polyesters have utility in the packaging industry for packaging various comestibles.

Abstract: Linear copolyesters are contemplated having the following repeating units: ##STR1## and ##STR2## and --O--CH.sub.2 --CH.sub.2 --O-- in their backbone structure. These polyesters have utility in the packaging industry for packaging various comestibles.

Abstract: Improvements in methods for protecting comestibles, e.g., foodstuffs, medicines, and other like related substances are provided wherein these substances are enveloped in packages, preferably a molded container, which is formed from a linear copolyester consisting essentially of the reaction product of isophthalic acid, optionally, terephthalic acid, and bis(4-beta-hydroxyethoxyphenyl)sulfone, and ethylene glycol. The amount of isophthalic acid, and when employed terephthalic acid, will be in the range of from about 15 to 100 mole percent of isophthalic acid and from about 85 to zero mole percent of terephthalic acid.

Abstract: Copolyesters having an oxygen permeability of less than 15 cc.multidot.mil/100 in..sup.2 .multidot.day.multidot.atm. (at 50% relative humidity and about 73.degree. F.) and a glass transition temperature in excess of 72.degree. C. and having the following four repeating units are contemplated: ##STR1## Based on reactant charges the ratio of (b) units to (a) units will be about 80:20 to about 20:80. Containers made of these polyesters for packaging products of commerce like comestibles are also contemplated.

Abstract: Linear copolyesters formed from (A) isophthalic acid and, optionally, terephthalic acid and (B) bis(4-beta-hydroxyethoxyphenyl) sulfone and ethylene glycol are described. The linear polyesters contemplated have glass transition temperatures higher than that of poly(ethylene terephthalate) and oxygen and CO.sub.2 permabilities less than that of poly(ethylene terephthalate).

Abstract: Saturated polyesters are stabilized against thermal degradation to yield acetaldehyde by forming an intimate admixture of said polyester and 5-hydroxy isophthalic acid.

Abstract: Copolyesters having an oxygen permeability of less than 15 cc. mil/100 in..sup.2 .multidot.day.multidot.atm. (at 50% relative humidity and about 73.degree. F.) and a glass transition temperature in excess of 72.degree. C. and having the following four (4) repeating units are contemplated: ##STR1## Based on reactant charges the ratio of (b) units: (a) units will be about 90:10 to about 40:60. Containers made of these polyesters for packaging products of commerce like comestibles are also contemplated.

Abstract: Copolyesters having an oxygen permeability of less than 15 cc.multidot.mil/100 in..sup.2 .multidot.day.multidot.atm. (at 50% relative humidity and about 73.degree. F.) and a glass transition temperature in excess of 72.degree. C. and having the following four repeating units are contemplated: ##STR1## Based on reactant charges the ratio of (b) units: (a) units will be about 90:10 to about 40:60. Containers made of these polyesters for packaging products of commerce like comestibles are also contemplated.

Abstract: Copolyesters having an oxygen permeability of less than 15 cc.mil/100 in..sup.2. day.sup.. atm. (at 50% relative humidity and about 73.degree. F.) and a glass transition temperature in excess of 72.degree. C. and having the following four (4) repeating units are contemplated: ##STR1## Based on reactant charges the ratio of (b) units to (a) units will be about 80:20 to about 20:80. Containers made of these polyesters for packaging products of commerce like comestibles are also contemplated.