Chemistry: analytical and immunological testing – Composition for standardization – calibration – simulation,...
Reexamination Certificate
2007-07-10
2007-07-10
Teskin, Fred (Department: 1713)
Chemistry: analytical and immunological testing
Composition for standardization, calibration, simulation,...
C073S064540, C210S656000, C528S491000, C528S497000, C528S503000
Reexamination Certificate
active
10754373
ABSTRACT:
Polymer fractions such as polyethylene fractions can be produced that have a PDI less than about 2.3 and a Mwgreater than about 1,000,000 g/mol, 3,000,000 g/mol, or 6,000,000 g/mol. Such polyethylene fractions are separated from a UHMWPE parent polymer by first dissolving the parent polymer in a relatively good solvent. The conditions employed for such dissolution are selected to reduce the degradation of the parent polymer. The resulting parent solution is transported into a fractionation column in which a support is disposed. The fractionation column is thereafter operated at conditions effective to form a precipitate on the support comprising the desired polyethylene fraction. The polyethylene fraction may then be recovered from the fractionation column by repeatedly displacing a solvent
on-solvent mixture into the column to dissolve the polyethylene fraction. The relative concentrations of the solvent and the non-solvent are based on a solvent gradient profile of the polyethylene parent polymer.
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DesLauriers Paul J.
Hildebrand Melvin
Tso Chung C.
Yu Youlu
Carroll Rodney B.
Chevron Phillips Chemical Company LP
Conley & Rose, P.C.
Huseman Cheryl L.
Teskin Fred
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