发明名称 |
ULTRAHOCHMOLEKULARE POLYETHYLENFRAKTIONEN MIT ENGER MOLEKULARGEWICHTSVERTEILUNG UND VERFAHREN ZUR HERSTELLUNG UND VERWENDUNG DERSELBEN |
摘要 |
Polymer fractions such as polyethylene fractions can be produced that have a PDI less than about 2.3 and a M<SUB>w </SUB>greater 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/non-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. |
申请公布号 |
AT388968(T) |
申请公布日期 |
2008.03.15 |
申请号 |
AT20050705036T |
申请日期 |
2005.01.05 |
申请人 |
CHEVRON PHILLIPS CHEMICAL COMPANY LP |
发明人 |
TSO, CHUNG;HILDEBRAND, MELVIN;DESLAURIERS, PAUL;YU, YOULU |
分类号 |
C08F10/02;C08F6/04;C08F110/02 |
主分类号 |
C08F10/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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