E.i. Dupont De Nemours and Company

Invista North America S.a.r.l.

Beverly Jean Selle

Nathan E Houser

Gordon W Selling

Elizabeth Todd Singewald

Robert Dewhurst

Steven Peter Pardini

Commercial spandex can be prepared with greater efficiency, improved consistency and at lower costs from a high-solids content polyurethaneurea polymer solution. The polyurethaneurea is prepared using a combination of 4,4'-MDI and 2,4&#x2032;-MDI, and an amount of chain extenders and chain terminators such that the polymer solution, prior to spinning, is highly soluble and has an appropriate pre-spun IV and primary amine content. Such spandex fibers, and the fabrics and garments comprising them, have good dyeability and colorfastness, as well as other desirable characteristics.

Dyeable spandex

An aramid composition consisting essentially of repeat units derived from p-phenylenediamine, terephthalic acid, 3,3'-bibenzoic acid, and optionally chloroterephthalic acid, is disclosed. The aramids are especially useful for fibers, which after drawing usually have enhanced tensile moduli and strengths, which makes them especially useful in ropes and cables, and in composites.

Aramid composition

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Wilmington, DE, United States of America

Beverly Jean Selle