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US 4,067,850 AGranted
Filaments and fibers having improved dyeability prepared from bis ethoxylated tetramethyl bisphenol A
AssigneeBayer Aktiengesellschaft
InventorsArmin Kohler, Herbert Pelousek, Ekkehard Frohberg
Life of this patent
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Abstract
Filaments and fibers having improved dyeability comprising a terephthalic acid copolyester containing bis ethoxylated tetramethylbisphenol A in cocondensed form.
Claims7
Carrier-free dyeable filaments or fibers comprising a condensation product of terephthalic acid and a mixture of at least two glycols, one of which corresponds to the formula ##STR4## and is present in the amount of 4-15% by weight of the said condensation product.
Dependencies are inferred from the claim text.