Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Reexamination Certificate
2004-11-03
2010-11-23
Sergent, Rabon (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C008S543000, C008S926000, C139S42000D, C139S42000D, C139S421000, C528S048000, C528S061000, C528S067000, C528S076000, C528S080000, C528S083000, C528S906000
Reexamination Certificate
active
07838617
ABSTRACT:
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′-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.
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Dewhurst Robert
Houser Nathan E.
Pardini Steven Peter
Selle Beverly Jean
Selling Gordon W.
Geerlof Christina W.
INVISTA North America s.àr.l.
Sergent Rabon
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