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US 4,360,658 AGranted
Copolyester derived from terephthalic acid, phenylhydroquinone and hydroquinone
AssigneeEastman Kodak Company
InventorsWinston J. Jackson, Jr., Herbert F. Kuhfuss
Life of this patent
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Abstract
Copolyesters of terephthalic acid, phenylhydroquinone and 25 to 50 mole percent hydroquinone based on total moles of diol. These copolyesters are characterized by unexpected chemical resistance.
Claims4
Copolyester having a film- and fiber-forming molecular weight consisting essentially of the following divalent radicals ##STR2## wherein (B) is present in the amount of 50 to 75 mole percent and (C) is present in the amount of 25 to 50 mole percent based on total moles of (B) and (C).
Dependencies are inferred from the claim text.