Linear copolyesters of isophthalic acid 4,4'-sulfonyldibenzoic acid, bis(4-beta-hydroxyethoxyphenyl) sulfone and ethylene glycol

Claim 2

A linear copolyester suitable for use in the packaging of comestibles, said polyester being the polymeric reaction product of reactants consisting essentially of (A) isophthalic acid and 4,4'-sulfonyldibenzoic acid, and (B) bis(4-beta-hydroxyethoxyphenyl) sulfone and ethylene glycol.

Claim 3

The copolyester of claim 1 wherein the combined amount of said B reactants are about 110 mole percent to about 300 mole percent of the combined amount of said A reactants.

Claim 4

The copolyester of claim 2 wherein the molar amounts of said A reactants are about 45% to about 80% of isophthalic acid and about 20% to about 55% of 4,4'-sulfonyldibenzoic acid and the amount of said bis(4-beta-hydroxyethoxyphenyl) sulfone is about 60% to about 85% of the combined amount of said A reactants, said polyester having an O 2 permeability of less than about 7.4 cc.mil/100 in 2 .day.atm., a CO 2 permeability of less than about 65.6 cc.mil/100 in 2 .day.atm. and a glass transition temperature of at least about 121° C.

Claim 5

The copolyester of claim 3, said polyester having a CO 2 permeability of less than about 50.3 cc.mil/100 in 2 .day.atm. and an O 2 permeability of less than about 7.0 cc.mil/100 in 2 .day.atm. and a glass transition temperature between about 121° to about 129° C., and A reactants being about 60% to 80% isophthalic acid and about 20% to 40% 4,4'-sulfonyldibenzoic acid.

Claim 6

The copolyester of claim 2 wherein said A reactants are present in an amount of about 15% to about 60% 4,4'-sulfonyldibenzoic acid and about 85% to about 40% isophthalic acid and the amount of said bis(4-beta-hydroxyethoxyphenyl) sulfone is about 15% to about 90% of the combined amounts of said A reactants, the amounts of said A and B reactants being sufficient to provide an O 2 permeability of less than the of poly(ethylene terephthalate) and a glass transition temperature in excess of poly(ethylene terephthalate).

Claim 7

A molded container formed from materials which comprise a linear copolyester, said copolyester being the copolyester of claim 1.

Claim 8

A molded container formed from materials which comprise a linear copolyester, said copolyester being the copolyester of claim 3.

Claim 9

A molded container formed from materials which comprise a lineaar copolyester, said copolyester being the copolyester of claim 4.

Claim 10

A molded container formed from materials which comprise a linear copolyester, said copolyester being the copolyester of claim 5.

Claim 11

The molded container of claim 6 wherein said container is a biaxially oriented container.

Claim 12

A clear molded container formed from an organic polymer having an oxygen permeability of less than about 7.0 cc.mil/100 in 2 . day.atm., a carbon dioxide permeability of less than about 50.3 cc.mil/100 in 2 .day.atm. and a glass transition temperature in excess of about 121° C.

Claim 13

A clear molded container formed from an organic polymer having an oxygen permeability of less than about 7.0 cc.mil/100 in 2 . day.atm., a carbon dioxide permeability of less than about 50.3 cc.mil/100 in 2 .day.atm. and a glass transition temperature in excess of about 121° C.